Zeitschriftenartikel: „CBCT technologie“

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Jonczyk, M., F. Collettini, D. Geisel, D. Schnapauff, G. Böning, G. Wieners und G. Gebauer. „Radiation exposure during TACE procedures using additional cone-beam CT (CBCT) for guidance: safety and precautions“. Acta Radiologica 59, Nr. 11 (28.02.2018): 1277–84. http://dx.doi.org/10.1177/0284185118761203.

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Background During transarterial chemoembolization (TACE), cone-beam computed tomography (CBCT) can be used for tumor and feeding vessel detection as well as postembolization CT imaging. However, there will be additional radiation exposure from CBCT. Purpose To evaluate the additional dose raised through CBCT-assisted guidance in comparison to TACE procedures guided with pulsed digital subtraction angiography (DSA) alone. Material and Methods In 70 of 140 consecutive patients undergoing TACE for liver cancer, CBCT was used to facilitate the TACE. Cumulative dose area product (DAP), cumulative kerma(air), DAP values of DSA, total and cine specific fluoroscopy times (FT) of 1375 DSA runs, and DAP of 91 CBCTs were recorded and analyzed using Spearman's correlation, Mann–Whitney U-test, and Kruskal–Wallis test. P values < 0.05 were considered significant. Results Additional CBCT increased DAP by 2% ( P = 0.737), kerma(air) by 24.6% ( P = 0.206), and FT by 0.02% ( P = 0.453). Subgroup analysis revealed that postembolization CBCT for detection of ethiodized oil deposits added more DAP to the procedure. Performing CBCT-assisted TACE, DSA until first CBCT contributed about 38% to the total DAP. Guidance CBCT acquisitions conduced to 6% of the procedure's DAP. Additional DSA for guidance after CBCT acquisition required approximately 46% of the mean DAP. The last DSA run for documentation purposes contributed about 10% of the DAP. Conclusion CBCT adds radiation exposure in TACE. However, the capability of CBCT to detect vessels and overlay in real-time during fluoroscopy facilitates TACE with resultant reduction of DAPs up to 46%.

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Stana, Ademir Horia, Otilia Lavinia Stana (Gag), Gheorghe Ciobanu, Anca Porumb, Calin Gheorghe Cioban, Ramona Amina Popovici und Alexandra Moga. „Applications of Imaging Technologies in Maxillary Cyst Assessment“. Revista de Chimie 68, Nr. 5 (15.06.2017): 1130–36. http://dx.doi.org/10.37358/rc.17.5.5627.

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The use of dental radiographies is nowadays indispensible for the clinician, and the evolution of x-rays provide quality images of the anatomic structures. The indications for a radiographic exam must be based on a clinical examination of the patient. Although the most used radiographies in dentistry are the retroalveolar and the panoramic one, it is considered that the indication for a CBCT scanning should be professional justified and evaluated as a balance between the benefits and the risk of exposure at radiation. The CBCT scans provide good quality images of the anatomic structures, with an accurate delimitation of the pathologic lesions, fact that allows the practitioner to proper evaluate the surrounding structures. CBCT technique uses an x-ray beam shaped like a cone that records 3D images in a single gantry rotation (360 degrees) within 6-20 seconds, with a radiation dose that depends on several factors. The comparison of the radiation dose of the CBCT (11-674 mSv) and the panoramic radiography (2.7�24.3 mSv) demonstrates that the CBCT requires a higher dose of radiation, but the high image quality is competing with the ones obtained with MSCT (280�1,410 mSv). The panoramic radiography uses an x-ray beam that is angled at aproximately 8 degrees, providing the practitioner a 2D radiographic image of the anatomic structures. The disadvantages of the panoramic radiography are the overlapping of the anatomic structures, the distortion and the blurry image. The study is based on the measurements of cystic lesions of the mandibular and maxillary bone that were present on radiographies and CBCT scans of 25 patients. The result of the measurements was that significative differences were found between the panoramic image of the cyst and the reconstructive image that the CBCT.

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Emara, Aalaa, Neha Sharma, Florian S. Halbeisen, Bilal Msallem und Florian M. Thieringer. „Comparative Evaluation of Digitization of Diagnostic Dental Cast (Plaster) Models Using Different Scanning Technologies“. Dentistry Journal 8, Nr. 3 (02.08.2020): 79. http://dx.doi.org/10.3390/dj8030079.

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Rapidly developing digital dental technologies have substantially simplified the documentation of plaster dental models. The large variety of available scanners with varying degrees of accuracy and cost, however, makes the purchase decision difficult. This study assessed the digitization accuracy of a cone-beam computed tomography (CBCT) and an intraoral scanner (IOS), as compared to a desktop optical scanner (OS). Ten plaster dental models were digitized three times (n = 30) with each scanner. The generated STL files were cross-compared, and the RMS values were calculated. Conclusions were drawn about the accuracy with respect to precision and trueness levels. The precision of the CBCT scanner was similar to the desktop OS reference, which both had a median deviation of 0.04 mm. The IOS had statistically significantly higher deviation compared to the reference OS, with a median deviation of 0.18 mm. The trueness values of the CBCT was also better than that of IOS—median differences of 0.14 and 0.17 mm, respectively. We conclude that the tested CBCT scanner is a highly accurate and user-friendly scanner for model digitization, and therefore a valuable alternative to the OS. The tested IOS was generally of lower accuracy, but it can still be used for plaster dental model digitization.

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Lozano González, Óscar, und Marco Felipe Salas Orozco. „Imaging technologies for the detection of sinus pathologies of odontogenic origin. A review“. Revista Científica Odontológica 9, Nr. 1 (12.03.2021): e049. http://dx.doi.org/10.21142/2523-2754-0901-2021-049.

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Sinus pathologies of odontogenic origin (SPO) are common in the clinical consultation; however, the dentist has some complications to detect them because their discovery is usually incidental and through imaging studies that, in most cases, are of low quality. The objective of this review is to describe the pertinent imaging resources that allow the detection of the most frequent SPO and, at the same time, carry out an updated review of the scientific literature in order to recognize the imaging of both the maxillary sinus and the dental organs. The scientific literature focused on this topic, published between 2014 and 2020, was consulted. The review showed two important results: the first is that Cone Beam Tomography (CBCT) represents the imaging modality with the best performance for the detection of SPO by what can be considered the gold standard for this purpose. The second is that the most frequent SPO is sinus mucositis, which is related to odontogenic conditions such as periapical lesions and periodontal affectations. Although Cone Beam Computed Tomography (CBCT) is the most appropriate tool to detect SPO compared to images obtained by 2D devices, there are also other alternatives such as magnetic resonance imaging and ultrasonography, which seem to have a promising future.

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AKPABIO, Iniobong Aniefiok, Glory Emmanuel EDET und Joan Ekpo CYRIL. „UNDERLYING FACTORS AFFECTING UTILIZATION OF COMPUTER – BASED INTERNET TECHNOLOGIES BY AGRICULTURAL EXTENSION PERSONNEL IN AKWA IBOM, NIGER DELTA, NIGERIA“. International Journal of Research -GRANTHAALAYAH 9, Nr. 1 (13.02.2021): 399–50. http://dx.doi.org/10.29121/granthaalayah.v9.i1.2021.3143.

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The study sought to examine factors affecting utilization of Computer Based Internet Technologies (CBIT) by extension personnel in Akwa Ibom State, Nigeria. Relevant data were obtained from 180 respondents, while data analyses were achieved with the aid of descriptive and inferential statistical tools. Findings showed that 57.8 % of the respondents were male, 91.7% were married, with a mean age of 43years, while 62.8% respondents had no formal computer training. It was also revealed that, of the nine surveyed CBIT facilities and applications, only mobile phones were highly utilized, while I-pads/laptops and YouTube were the least utilized. It was also revealed that 62.8% respondents indicated that they had a low level of CBIT utilization, while level of CBIT utilisation was found to be influenced by financial, training, policy/personal barriers, social, technical and management factors. Results of tested hypotheses revealed that CBIT utilisation was not influenced by respondents’ personal characteristics, and no significant difference was observed in terms of level of CBIT utilization between field extension personnel (FEP) and supervisory extension personnel (SEP). It was concluded that extension personnel are constrained from using CBIT due to the prohibitive cost of CBIT software and maintenance, inappropriate infrastructure and lack of access to training opportunities. It is recommended, among others, that policy makers should facilitate the evolution of appropriate CBIT policies to enhance access to appropriate tools by extension personnel.

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Schnapauff, Dirk, Andreas Maxeiner, Gero Wieners, Timm Denecke, Bernd Hamm, Bernhard Gebauer und Martin Jonczyk. „Semi-automatic prostatic artery detection using cone-beam CT during prostatic arterial embolization“. Acta Radiologica 61, Nr. 8 (12.12.2019): 1116–24. http://dx.doi.org/10.1177/0284185119891689.

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Background Due to the broad variability of the prostatic artery (PA), its origin, small calibers, and tortuous courses, prostatic arterial embolization (PAE) is challenging, time-consuming, and results in high radiation doses. Purpose To evaluate the accuracy of PA detection using cone-beam computed tomography (CBCT) performed from the aortic bifurcation in combination with a semi-automatic detection software in comparison to oblique view digital subtraction angiography (DSA) with internal iliac artery (IIA) injection. Material and Methods Twenty-two consecutive patients were included in this retrospective, IRB-approved study between July and December 2017. CBCT from the aorta and 30° oblique-view DSA from both IIAs were obtained for PA detection. Results of suggested PAs from the semi-automatic vessel detection software after CBCT and IIA DSA were compared. Moreover, dose area product (DAP) was recorded. Statistical analysis included Spearman’s correlation, Mann–Whitney U test, and the Wilcoxon test considering P<0.05 as significant. Results PA type was classified significantly better with CBCT compared to DSA ( P=0.047). In IIA DSA, PAs could not be identified in 18% on the left and in 17% on the right side. CBCT detected all PAs, although truncation occurred in 59% because of the limited field of view. Mean DAP of the whole procedure was 257,161.32±127,909.36 mGy*cm2. Mean DAPs were for a single DSA 14,502.51±9,437.67 mGy*cm2 and for one CBCT 15,589.23±2,722.49 mGy*cm2. A mean of 14.82 DSAs and only one CBCT were performed. CBCT accounted for 6% and DSA for 84% of the entire DAP of the procedure. Conclusion CBCT with semi-automatic feeding vessel detection software detects PAs more accurately than IIA DSA and may reduce radiation dose.

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Impellizzeri, Alessandra, Martina Horodynski, Adriana De Stefano, Gaspare Palaia, Antonella Polimeni, Umberto Romeo, Elisabeth Guercio-Monaco und Gabriella Galluccio. „CBCT and Intra-Oral Scanner: The Advantages of 3D Technologies in Orthodontic Treatment“. International Journal of Environmental Research and Public Health 17, Nr. 24 (16.12.2020): 9428. http://dx.doi.org/10.3390/ijerph17249428.

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Background: The aim is to demonstrate the validity of the monitoring through intraoral scanner of the dental movements and the real impact, advantages, and convenience, in terms of treatment time and efficiency gain, to frequently monitor a patient with the scanner application. Methods: A movement control of palatally impacted canines was performed, surgically treated with laser opercolectomy. Three-dimensional models of the patient’s dental arch were obtained with intraoral scanner during a monitoring time of 4 months. The STL (Standard Triangle Language) files were superimposed with the 3D models extrapolated from the pre-operative CT (Computerized Tomography). The measurements of eruption, exposed palatal and vestibular areas, and distances between the canines and the incisors were performed, using digital technologies and with a digital caliber. Results: Descriptive and inferential statistical analysis of the data obtained from both conventional and digital monitoring has been realized and performing the T Student Test for paired data. Conclusion: The advantages of digital monitoring are numerous, like the possibility to reduce the error of method caused by manual measurement on plaster casts and the possibility to compare the pattern and amount of eruption of the canine in the same patient overtime.

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Kawauchi, Satoru, Koichi Chida, Takashi Moritake, Yuji Matsumaru, Yusuke Hamada, Hideyuki Sakuma, Shogo Yoda, Lue Sun, Masayuki Sato und Wataro Tsuruta. „ESTIMATION OF PATIENT LENS DOSE ASSOCIATED WITH C-ARM CONE-BEAM COMPUTED TOMOGRAPHY USAGE DURING INTERVENTIONAL NEURORADIOLOGY“. Radiation Protection Dosimetry 184, Nr. 2 (17.11.2018): 138–47. http://dx.doi.org/10.1093/rpd/ncy188.

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Abstract The purpose of this study was to investigate the dose distribution and lens doses associated with C-arm cone-beam computed tomography (CBCT), using a head phantom, and to estimate the contribution ratio of C-arm CBCT to each patient’s lens dose during interventional neuroradiology (‘lens dose ratio’) in 109 clinical cases. In the phantom study, the peak skin doses and respective right and left lens doses of C-arm CBCT were as follows: 63.0 ± 1.9 mGy, 19.7 ± 1.4 mGy and 21.9 ± 0.8 mGy in whole brain C-arm CBCT and 39.2 ± 1.4 mGy, 4.7 ± 0.9 mGy and 3.6 ± 0.3 mGy in high-resolution C-arm CBCT. In the clinical study, the lens dose ratios were 25.4 ± 8.7% in the right lens and 19.1 ± 9.8% in the left lens. This study shows that, on average, ~25% of patients’ total lens dose was contributed by C-arm CBCT.

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van Eijnatten, Maureen, Ferco Henricus Berger, Pim de Graaf, Juha Koivisto, Tymour Forouzanfar und Jan Wolff. „Influence of CT parameters on STL model accuracy“. Rapid Prototyping Journal 23, Nr. 4 (20.06.2017): 678–85. http://dx.doi.org/10.1108/rpj-07-2015-0092.

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Purpose Additive manufactured (AM) skull models are increasingly used to plan complex surgical cases and design custom implants. The accuracy of such constructs depends on the standard tessellation language (STL) model, which is commonly obtained from computed tomography (CT) data. The aims of this study were to assess the image quality and the accuracy of STL models acquired using different CT scanners and acquisition parameters. Design/methodology/approach Images of three dry human skulls were acquired using two multi-detector row computed tomography (MDCT) scanners, a dual energy computed tomography (DECT) scanner and one cone beam computed tomography (CBCT) scanner. Different scanning protocols were used on each scanner. All images were ranked according to their image quality and converted into STL models. The STL models were compared to gold standard models. Findings Image quality differed between the MDCT, DECT and CBCT scanners. Images acquired using low-dose MDCT protocols were preferred over images acquired using routine protocols. All CT-based STL models demonstrated non-uniform geometrical deviations of up to +0.9 mm. The largest deviations were observed in CBCT-derived STL models. Practical implications While patient-specific AM constructs can be fabricated with great accuracy using AM technologies, their design is more challenging because it is dictated by the correctness of the STL model. Inaccurate STL models can lead to ill-fitting implants that can cause complications after surgery. Originality/value This paper suggests that CT imaging technologies and their acquisition parameters affect the accuracy of medical AM constructs.

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Petitpas, Laurent. „De l’utilisation des technologies 3D numériques pour l’analyse, la planification et le rétrocontrôle d’un traitement orthodontique de troubles fonctionnels temporo-mandibulaires“. Revue d'Orthopédie Dento-Faciale 53, Nr. 3 (September 2019): 297–315. http://dx.doi.org/10.1051/odf/2019027.

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Nous souhaitons présenter dans cet article, un cas clinique pédagogique d’une adolescente où les analyses numériques ont été utilisées tout au long de la gestion de sa reprise de traitement. L’arrivée de la tomodensitométrie à faisceau conique (CBCT) et de logiciels informatiques 3D, permet aux orthodontistes de fournir des diagnostics, des simulations et des traitements plus précis. D’un point de vue éthique, il n’est pas acceptable de soigner sans utiliser les méthodes les plus bénéfiques aux patients. En effet, les fichiers DICOM de CBCT renferment une multitude d’informations que nous ne possédions pas auparavant. Des techniques de segmentation par des logiciels de sélection par seuillage nous permettent de visualiser précisément les rapports radiculaires et osseux en 3D. Une connaissance précise de la position des racines dentaires et des bases osseuses améliore la détermination du succès du traitement orthodontique par une surveillance accrue. De nos jours, compte tenu de la rapidité du développement technologique, une combinaison de scanners intra-oraux, d’enregistrements numériques 3D, de multi-bagues individualisés, d’arcs personnalisés, de collage indirect numérique, et d’aligneurs de finition deviendra bientôt une obligation de moyens orthodontiques.

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Petitpas, Laurent. „De l’utilisation des technologies 3D numériques pour l’analyse, la planification et le rétrocontrôle d’un traitement orthodontique de troubles fonctionnels temporo-mandibulaires“. Revue d'Orthopédie Dento-Faciale 54, Nr. 3 (September 2020): 331–48. http://dx.doi.org/10.1051/odf/2020034.

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Nous souhaitons présenter dans cet article, un cas clinique pédagogique d’une adolescente où les analyses numériques ont été utilisées tout au long de la gestion de sa reprise de traitement. L’arrivée de la tomodensitométrie à faisceau conique (CBCT) et de logiciels informatiques 3D, permet aux orthodontistes de fournir des diagnostics, des simulations et des traitements plus précis. D’un point de vue éthique, il n’est pas acceptable de soigner sans utiliser les méthodes les plus bénéfiques aux patients. En effet, les fichiers DICOM de CBCT renferment une multitude d’informations que nous ne possédions pas auparavant. Des techniques de segmentation par des logiciels de sélection par seuillage nous permettent de visualiser précisément les rapports radiculaires et osseux en 3D. Une connaissance précise de la position des racines dentaires et des bases osseuses améliore la détermination du succès du traitement orthodontique par une surveillance accrue. De nos jours, compte tenu de la rapidité du développement technologique, une combinaison de scanners intra-oraux, d’enregistrements numériques 3D, de multi-bagues individualisés, d’arcs personnalisés, de collage indirect numérique, et d’aligneurs de finition deviendra bientôt une obligation de moyens orthodontiques.

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Lou, Yifei, Tianye Niu, Xun Jia, Patricio A. Vela, Lei Zhu und Allen R. Tannenbaum. „Joint CT/CBCT deformable registration and CBCT enhancement for cancer radiotherapy“. Medical Image Analysis 17, Nr. 3 (April 2013): 387–400. http://dx.doi.org/10.1016/j.media.2013.01.005.

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Felice, Pietro, Lorenzo Bonifazi, Maryia Karaban, Cesare Berti, Gerardo Pellegrino und Carlo Barausse. „Dynamic Navigated “Sandwich” Technique: A Novel Surgical Approach for Safe Osteotomies in the Rehabilitation of an Atrophic Posterior Mandible: A Case Report“. Methods and Protocols 4, Nr. 2 (16.05.2021): 34. http://dx.doi.org/10.3390/mps4020034.

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A 56-year-old female patient with vertical atrophy of the right posterior mandible was treated adopting an interpositional bone block approach using a cancellous heterologous bone block. Osteotomies of the patient’s mandible were performed with the help of dynamic computer-assisted surgery using virtual anatomical patient information obtained from a cone beam computed tomography (CBCT). The use of the dynamic computer-assisted surgery allowed authors to perform the horizontal osteotomy line as planned preoperatively on the CBCT virtual reconstruction, trying to minimize the risks of the inlay technique. No neurological complications were observed after surgery. The inlay technique could benefit from the aid of dynamic navigation technologies in posterior atrophic mandibles, increasing the reproducibility of the technique. A likely safer method for performing osteotomies with the “sandwich” technique in the posterior atrophic mandible is reported.

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Jaroma, Antti, Juha-Sampo Suomalainen, Lea Niemitukia, Tarja Soininvaara, Jari Salo und Heikki Kröger. „Imaging of symptomatic total knee arthroplasty with cone beam computed tomography“. Acta Radiologica 59, Nr. 12 (01.03.2018): 1500–1507. http://dx.doi.org/10.1177/0284185118762247.

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Background Computed tomography (CT) can be used to assess the rotational alignment of prosthesis components to identify possible underlying causes of symptomatic total knee arthroplasty (TKA). The use of cone beam computed tomography (CBCT) for the imaging of extremities is relatively new, although it has been widely used in dental imaging. Purpose To assess the intra- and inter-observer reproducibility of CBCT, as well as to validate CBCT for TKA component and periprosthetic bone diagnostics. Material and Methods CBCT scans were performed on 18 patients the day before a scheduled revision TKA, from which the intra- and inter-observer reproducibility were assessed. Component rotation and loosening were evaluated. Perioperative bone defects were classified. Results The inter-observer intraclass coefficient correlation (ICC) for femoral component rotation was 0.41 (95% confidence interval [CI] = 0.12–0.69). For the tibial component, the ICC was 0.87 (95% CI = 0.74–0.94). Intra-observer reproducibilities were 0.70 (95% CI = 0.35–0.87) and 0.92 (95% CI = 0.80–0.97), respectively. The sensitivity for tibial component loosening was 97% and the specificity was 85%. The reliability of bone defect classification was only weak to moderate. Conclusion Two-dimensional (2D) CBCT scanning provides reliable and reproducible data for determining the rotation of femoral and tibial components, while showing minor overestimation of tibial component loosening. CBCT is a promising new tool for the evaluation of symptomatic knee arthroplasty patients, with a substantially lower radiation dose compared to conventional 2D multi-slice CT.

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Santos, Caroline Chepernate Vieira dos, Izabella Sol, Karen Rawen Tonini, Leda Maria Pescinini Salzedas, Fernanda Costa Yogui und Daniela Ponzoni. „Evaluation of the size and location of the mental foramen and anterior loop of the lower alveolar nerve in the Brazilian population using cone beam computed tomography“. Research, Society and Development 10, Nr. 8 (14.07.2021): e36410817216. http://dx.doi.org/10.33448/rsd-v10i8.17216.

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Objective: The aim of this study was to evaluate the size, shape and location of the mental foramen (MF) and anterior loop (AL) in the Brazilian population through the analysis of cone beam computed tomography (CBCT) and panoramic radiography (PR). Method: We analyzed the location, shape and size of the MF, the distance between the upper wall of the MF and the alveolar crest (AC), the size of the AL and the presence of lingual anastomosis. Results: Fifty PR and CBCT exams were analyzed. In relation to the MF, the most common location was between premolars (56%), the most common shape was the oval shape (83%) and the average size in the PR was 3.63 mm and in the CBCT was3.66 mm. The average distance from the MF to the AC in the PR was 17.29 mm and in the CBCT was 11.48 mm. The average AL size was 3 mm, the smallest being 1 mm and the largest being 5 mm. Static analysis was performed to verify the relationship between the distance from the foramen to the AC with the values that were found in the PR and CBCT, which showed a statistically significant difference (p=<0.001) between them. Lingual anastomosis could be seen in 22% of the analyzed hemimandibles. Conclusion: CBCT is a reliable diagnostic test for planning rehabilitation near the MF. The distance between the implant and the foramen must be analyzed individually.

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Jiao, Dechao, Na Xie, Gang Wu, JianZhuang Ren und Xinwei Han. „C-arm cone-beam computed tomography with stereotactic needle guidance for percutaneous adrenal biopsy: initial experience“. Acta Radiologica 58, Nr. 5 (30.09.2016): 617–24. http://dx.doi.org/10.1177/0284185116661882.

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Background Metastasis to the adrenal glands is frequent in patients with various cancers and adrenal gland biopsy is routinely performed using ultrasound or computed tomographic (CT) guidance. However, this method is technically challenging, especially in the case of small masses. Purpose To determine whether the new real-time stereotactic needle guidance technique C-arm cone-beam CT (CBCT) allows safe and accurate biopsy of adrenal gland masses, especially those in hard-to-reach anatomical locations. Material and Methods CBCT guidance was used to perform 60 stereotactic biopsy procedures of lesions that were inaccessible with ultrasound or CT guidance. The needle path was carefully planned and calculated on the CBCT virtual navigation guidance system, which acquired 3D CT-like cross-sectional images. The adrenal biopsy procedures were performed with fluoroscopic feedback. Technical success rate, sensitivity, specificity, accuracy, and complications were investigated. Results The technical success rate of adrenal biopsy under CBCT virtual navigation was 100%, with a mean total procedure time of 14.6 ± 3.6 min. Of the 60 lesions, 46 were malignant, 11 were benign, and three were non-diagnostic. The three non-diagnostic lesions proved to be malignant. Thus, the sensitivity, specificity, and accuracy were 93.8%, 100%, and 95.0%, respectively. Minor bleeding occurred in two (3.3%) cases. Conclusion CBCT guidance allows safe and accurate biopsy of adrenal gland masses and may be especially useful for hard-to-reach anatomical locations.

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Li, Zheng Fu, Xi Cheng Wang, Quan Guo und Ling Kang. „Service-Oriented Computational Biology Community Cloud“. Applied Mechanics and Materials 416-417 (September 2013): 1527–32. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.1527.

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Cloud computing is rising fast these years. It is making software or hardware more attractive through transform them to services. It provides a new developing opportunity for many research fields. A service-oriented Computational Biology Community Cloud (CBCC) is constructed in this paper. Computational biology related programs are collected, integrated and systematic. A four-layer cloud architecture of CBCC is presented and analyzed in this paper. The key technologies are also discussed. By using browsers, CBCC exposes users a lot of simple and easy use services. Users can easily begin their works on CBCC, process results or make their conclusions. Users no need to learn complex programming or prepare many files like before. Some typical applications on CBCC are introduced. By using CBCC, researchers of computational biology can save a lot time and enhance their working efficiency.

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Sun, Tao, Nanbo Sun, Jing Wang und Shan Tan. „Iterative CBCT reconstruction using Hessian penalty“. Physics in Medicine and Biology 60, Nr. 5 (12.02.2015): 1965–87. http://dx.doi.org/10.1088/0031-9155/60/5/1965.

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Ierardi, Anna Maria, Filippo Pesapane, Nicola Rivolta, Enrico Maria Fumarola, Salvatore Alessio Angileri, Filippo Piacentino und Gianpaolo Carrafiello. „Type 2 endoleaks in endovascular aortic repair: cone beam CT and automatic vessel detection to guide the embolization“. Acta Radiologica 59, Nr. 6 (31.08.2017): 681–87. http://dx.doi.org/10.1177/0284185117729184.

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Background Dual-phase cone beam computed tomography (DP-CBCT) and automatic vessel detection (AVD) software are helpful tools for detecting arteries before planned endovascular interventions. Purpose To evaluate the usefulness of DP-CBCT and AVD software in guiding the trans-arterial embolization (TAE) of challenging T2 lumbar endoleaks (T2-L-EL). Material and Methods Ten patients with T2-L-EL were included in this study. The accuracy of DP-CBCT and the AVD software was defined by the ability to detect the endoleak and arterial feeding vessel, respectively. Technical success was defined as the correct positioning of the microcatheter using AVD software and the successful embolization of the endoleak. Clinical success was defined as the absence of recurrent endoleaks during follow-up and the stability of the sac diameter for persistent endoleaks. The total volume of iodinated contrast medium, overall procedure time, mean procedural radiation dose, and mean fluoroscopy time were recorded. Results The EL was detected by DP-CBCT in all patients. The AVD software identified the feeding arterial branch in all cases. In one patient, the nidus of the endoleak was not reached due to the small caliber of the feeding artery, even though the software had clearly identified the vessel route. The mean contrast volume was 109 mL, the mean overall procedural time was 74.3 min. The mean procedural radiation dose was 140.97 Gy cm2, and the mean fluoroscopy time was 29.8 min. Conclusion The use of DP-CBCT and the AVD software is feasible and may facilitate successful embolization in challenging occult T2-L-EL with complex vasculature.

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Mirkovic, Sinisa, Igor Budak, Tatjana Puskar, Ana Tadic, Mario Sokac, Zeljko Santosi und Tatjana Djurdjevic-Mirkovic. „Application of modern computer-aided technologies in the production of individual bone graft: A case report“. Vojnosanitetski pregled 72, Nr. 12 (2015): 1126–31. http://dx.doi.org/10.2298/vsp140915117m.

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Introduction. An autologous bone (bone derived from the patient himself) is considered to be a ?golden standard? in the treatment of bone defects and partial atrophic alveolar ridge. However, large defects and bone losses are difficult to restore in this manner, because extraction of large amounts of autologous tissue can cause donor-site problems. Alternatively, data from computed tomographic (CT) scan can be used to shape a precise 3D homologous bone block using a computer-aided design-computer-aided manufacturing (CAD-CAM) system. Case report. A 63-year old male patient referred to the Clinic of Dentistry of Vojvodina in Novi Sad, because of teeth loss in the right lateral region of the lower jaw. Clinical examination revealed a pronounced resorption of the residual ridge of the lower jaw in the aforementioned region, both horizontal and vertical. After clinical examination, the patient was referred for 3D cone beam (CB)CT scan that enables visualization of bony structures and accurate measurement of dimensions of the residual alveolar ridge. Considering the large extent of bone resorption, the required ridge augmentation was more than 3 mm in height and 2 mm in width along the length of some 2 cm, thus the use of granular material was excluded. After consulting prosthodontists and engineers from the Faculty of Technical Sciences in Novi Sad we decided to fabricate an individual (custom) bovine-derived bone graft designed according to the obtained 3D CBCT scan. Conclusion. Application of 3D CBCT images, computer-aided systems and software in manufacturing custom bone grafts represents the most recent method of guided bone regeneration. This method substantially reduces time of recovery and carries minimum risk of postoperative complications, yet the results fully satisfy the requirements of both the patient and the therapist.

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Dawson, George A., Alice V. Cheuk, Shruti Jolly, Ruchika Gutt, Helen Fosmire, Stephen T. Lutz, Mitchell Steven Anscher et al. „Advanced radiation oncology technology within the Veterans Health Administration (VHA).“ Journal of Clinical Oncology 32, Nr. 30_suppl (20.10.2014): 52. http://dx.doi.org/10.1200/jco.2014.32.30_suppl.52.

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52 Background: The rapid evolution of technology in the treatment of cancer has paralleled other technological advancements in modern society. Intensity Modulated Radiotherapy (IMRT), Image Guided Radiotherapy (IGRT), Brachytherapy (BT), Cone Beam Computed Tomography (CBCT), Stereotactic Radiosurgery (SRS), and Stereotactic Body Radiotherapy (SBRT) facilitate treatment with higher, more conformal radiation doses, potentially improving cancer control while reducing normal tissue toxicity. Recent Surveillance, Epidemiology and End Results (SEER) program data and physician surveys indicate prostate BT is declining and the integration of SRS and SBRT is slower compared to IMRT. As utilization of technology increases, an understanding of its availability within the VHA is necessary to ensure quality and patient safety. Methods: An electronic survey was sent to 82 Radiation Oncologists (ROs)at 38 active VHA Radiation Oncology Centers with subsequent follow-up phone calls. The survey occurred from May-June 2014. ROs were queried on the availability of advanced RT technologies including IMRT, IGRT, BT, CBCT, SRS and SBRT at their facility. Practitioner specific details: years in practice, academic appointment and VHA employment status were collected. Results: Responses were obtained from 62 ROs representing 75% of VHA ROs and 34 or 89% of facilities. Full time VHA employees made up 60% of respondents with 35% in practice for <5 years and 34% practicing for >20 years; 71% held an academic appointment. The Table shows on site availability of advanced RT technologies within the 34 VHA sites that responded. Conclusions: For veterans receiving cancer treatment, VHA ROs are able to routinely use IMRT and IGRT with CBCT capabilities. However, stereotactic (SRS and SBRT) and BT services are less available, and may require referrals externally or to other VHA facilities. Limited availability of SRS and SBRT parallels the community experience. Likewise the decreasing utilization of BT is common to the VHA and private sector. SBRT, SRS and BT require significant expertise and technology. [Table: see text]

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Huang, Jin-Feng, Xiao-Zhao Chen und Hong Wang. „Quality Control in Dental Cone-Beam Computed Tomography“. Applied Sciences 11, Nr. 17 (02.09.2021): 8162. http://dx.doi.org/10.3390/app11178162.

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Poor medical equipment may lead to misdiagnosis and missed diagnosis by doctors, leading to medical accidents. Given the differences in imaging methods, the performance determination method for conventional computed tomography (CT) does not apply to dental cone-beam computed tomography (CBCT). Therefore, a detection method that is more suitable for the characteristics of dental CBCT and more convenient for on-site operation in hospitals needs to be urgently developed. Hence, this study aimed to design a robust and convenient detection method to control the quality of dental CBCT, grasp the safety information of the equipment in a timely and effective manner, discover and evaluate equipment risks, and take reasonable and necessary countermeasures, thereby, reducing the risk of medical malpractice. This study adopted dose-area product to measure dose parameters and used objective quantitative evaluation methods instead of subjective evaluation methods for spatial resolution, contrast-to-noise ratio index, and uniformity. The dental CBCT of 10 dental hospitals and clinics were tested, and the findings revealed that the testing methods used had good accuracy and applicability.

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Lewis, John H., Ruijiang Li, Xun Jia, W. Tyler Watkins, Yifei Lou, William Y. Song und Steve B. Jiang. „Mitigation of motion artifacts in CBCT of lung tumors based on tracked tumor motion during CBCT acquisition“. Physics in Medicine and Biology 56, Nr. 17 (03.08.2011): 5485–502. http://dx.doi.org/10.1088/0031-9155/56/17/003.

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Gupta, Ajai, Suprabha Rathee, Jaihans Agarwal und Renu B. Pachar. „Measurement of Crestal Cortical Bone Thickness at Implant Site: A Cone Beam Computed Tomography Study“. Journal of Contemporary Dental Practice 18, Nr. 9 (2017): 785–89. http://dx.doi.org/10.5005/jp-journals-10024-2127.

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ABSTRACT Aim Dental implants have emerged as a new treatment modality for the majority of patients complaining of missing teeth. Bone quantity and bone quality are among various factors which ensure the longevity of dental implant in the patient's mouth. The assessment of cortical bone thickness of the outer layer and the cancellous bone density by cone beam computed tomography (CBCT) has proved beneficial for the patient. This study aimed at presurgical measurement of crestal bone thickness at various implant sites using CBCT images. Materials and methods This study was conducted in the Department of Prosthodontics in the year 2015. It included 218 patients who wanted to replace missing teeth. Patients were subjected to CBCT scan using NewTom CBCT machine operating at 120 kVp and 5 mA with a resolution of 0.1 × 0.1 × 0.1 mm3. New Net Technologies (NNT) software with a slice thickness of 0.1 mm was used in this study. A total of 780 implant sites were identified on images of 218 patients. In all patients, the measurement of crestal bone thickness in the region of implant site was performed with NNT software. The buccolingual measurement of crestal bone was done in cross sections obtained after CBCT. Results Out of 218 patients, males were 110 and females were 108. The difference between gender was nonsignificant (p > 0.05). Out of 780 implant sites, 370 were in the maxilla and 410 were in mandible. The difference was nonsignificant (p > 0.05). Out of 780 implant sites, 210 were in anterior maxilla and 160 were in the posterior maxilla. Totally, 235 sites were in anterior mandible and 175 were in the posterior mandible. The distribution was nonsignificant (p = 0.15). The mean crestal bone thickness in anterior maxilla was 0.82 mm, in posterior maxilla was 0.76 mm, in anterior mandible was 1.08 mm, and in posterior mandible was 1.18 mm. The difference among regions was significant (p = 0.01). Conclusion The highest thickness of cortical bone was observed in posterior mandible followed by anterior mandible, anterior maxilla, and posterior maxilla. Thus, considering the less cortical thickness in the posterior maxillary region, the implant placement should be done with proper attention. Clinical significance Dental implant is the need of the hour. It is beneficial to patients in terms of longer survival rates. With CBCT, all measurements, such as bone quality and quantity have become easy because of three-dimensional nature. This has proved to be beneficial in the analysis of cortical bone thickness as well as measuring the distance from anatomical structures. How to cite this article Gupta A, Rathee S, Agarwal J, Pachar RB. Measurement of Crestal Cortical Bone Thickness at Implant Site: A Cone Beam Computed Tomography Study. J Contemp Dent Pract 2017;18(9):785-789.

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Tallarico, Marco. „Computerization and Digital Workflow in Medicine: Focus on Digital Dentistry“. Materials 13, Nr. 9 (08.05.2020): 2172. http://dx.doi.org/10.3390/ma13092172.

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Continuously evolving technologies make dentistry one of the most advanced sectors in the field of medicine. The digital improvements in recent years have brought many advantages to clinicians and patients, including reduced working times, lower costs and increased efficiency of performance. Some of the most important digital technologies introduced in the dental filed are cone beam computer tomography (CBCT) scan, Computer Aided Design/Computer Aided Manufacturing (CAD-CAM) systems, and intraoral scanners. All of these allow faster and more accurate rehabilitations, with the opportunity of pre-simulation of the final treatment. The evolution of computer science has brought significant advantages in the medical and dental fields, making the diagnosis and execution of even complex treatments, such as implantology and bone reconstruction, possible. The digital world is trying to supplant the traditional analog workflow, and over time, with the further advance of technologies, it should tend to be the treatment of choice of our patients.

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Balut, Nasib, Digant P. Thakkar, Enrique Gonzalez, Rodrigo Eluani und Luis David Silva. „Digital orthodontic indirect bonding systems: A new wave“. APOS Trends in Orthodontics 10 (18.09.2020): 195–200. http://dx.doi.org/10.25259/apos_18_2020.

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Digital technologies are progressing with leaps and bounds and the field of orthodontics is not untouched by it, with innovations like intraoral scanners and 3D printers being easy to own and maintain and increased availability of biocompatible 3D printing materials orthodontist are curious to use this technology to improve orthodontic bracket positioning which would require minimal to no repositioning during the course of treatment. The authors here have tried to outline 2 different methods using CBCT and VTO as guide to decide the bracket positioning digitally and using 3D printed Indirect Bonding trays for orthodontic bonding.

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Sledge, George W. „Transforming Technologies and Breast Cancer“. Clinical Breast Cancer 6, Nr. 4 (Oktober 2005): 283. http://dx.doi.org/10.3816/cbc.2005.n.031.

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Kim, Jinwoo, Hosang Jeon und Ho Kyung Kim. „MONTE CARLO DOSE ASSESSMENT IN DENTAL CONE-BEAM COMPUTED TOMOGRAPHY“. Radiation Protection Dosimetry 193, Nr. 3-4 (März 2021): 190–99. http://dx.doi.org/10.1093/rpd/ncab039.

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Abstract Most dental cone-beam computed tomography (CBCT) uses an x-ray beam field covering the maxillomandibular region and the width-truncated detector geometry. The spatial dose distribution in dental CBCT is analyzed in terms of local primary and remote secondary doses by using a list-mode analysis of x-ray interactions obtained from the Monte Carlo simulations. The patient-dose benefit due to the width-truncated detector geometry is also investigated for a wide range of detector offsets. The developed dose estimation agrees with the measurement in a relative error of 7.7%. The secondary dose outside of the irradiation field becomes larger with increasing tube voltage. The dose benefit with the width-truncated geometry linearly increases as the detector-offset width is decreased. Leaving the CT image quality out of the account, the MC results reveal that the operation of dental CBCT with a lower tube voltage and a smaller detector-offset width is beneficial to the patient dose.

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Serafin, Marco, Luca Esposito, Viviana Conti, Rosamaria Fastuca, Manuel Lagravère und Alberto Caprioglio. „CBCT Comparison of Dentoskeletal Effects of Haas-Type and Hyrax-Type Expanders Using Deciduous Teeth as Anchorage: A Randomized Clinical Trial“. Applied Sciences 11, Nr. 15 (31.07.2021): 7110. http://dx.doi.org/10.3390/app11157110.

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The aim of this study was to compare the three-dimensional dentoskeletal effects of Haas-type and Hyrax-type expanders using primary teeth as anchorage for rapid palatal expansion (RPE). Thirty-four subjects in mixed dentition were divided according to their expander’s type: Hyrax (n = 16; 6F, 10M; mean age 8 ± 3 years) or Haas (n = 18; 14F, 4M; mean age 8 ± 2 years). Each patient underwent CBCTs before (T0) and after RPE (T1). Dentoskeletal changes were collected. A paired sample t-test and independent t-test were used to compare each variable within the same group and between groups, respectively, with a 5% significance. The Hyrax group showed an increase in all dentoskeletal parameters; skeletal expansion was significantly increased anteriorly (1.76 mm) and posteriorly (1.93 mm). The greatest dental expansion was observed in the anchorage unit (6.47 mm), about twice as much as permanent molars (3.42 mm). The same statistical significance of Haas group measurements was observed; anteriorly skeletal expansion (2.97 mm) was greater than posteriorly (1.93 mm) and dental expansion was greater on anchored teeth (6.80 mm) than non-anchored teeth (4.57 mm). No statistical significance was observed between Hyrax and Hass groups. CBCT analysis showed that, in RPE, the dental expansion was greater than skeletal expansion. No significant or clinical changes were observed between Hyrax and Haas appliances anchored to primary teeth.

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Nemes, Bálint, Dorottya Frank, Andreu Puigdollers und Domingo Martín. „Occlusal Splint Therapy Followed by Orthodontic Molar Intrusion as an Effective Treatment Method to Treat Patients with Temporomandibular Disorder: A Retrospective Study“. Applied Sciences 11, Nr. 16 (06.08.2021): 7249. http://dx.doi.org/10.3390/app11167249.

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Our goal is to show that temporomandibular disorder (TMD) patients with orthopaedic instability can be effectively treated by the combination of occlusal splint therapy and molar intrusion. Diagnostic records of 18 patients reporting previous TMD and treated with splint therapy were evaluated. Postsplint anterior open bite was treated by skeletally anchored molar intrusion. Changes in overjet (OJ), overbite (OB) were measured on articulator mounted models: initially in maximal intercuspidation (MI), centric “de jour”, postsplint centric relation (CR) and postintrusion CR. Changes in ANB (A point-Nasion-B point) angle, mandibular plane–palatal plane angle and facial axis angle were assessed on lateral cephalograms. Morphological changes of the condyle were detected on pre-and posttreatment CBCT images. When compared screening mountings to MI models, significant differences were found in OJ and OB. Following splint wear, there was a significant increase in lower facial height and significant decrease in facial axis angle, which in turn increased ANB angle. OB and OJ showed a significant change on the postsplint mountings when compared to MI. After intrusion, mandible exhibited counterclockwise rotation, which decreased lower facial height, increased OB and facial axis angle and decreased ANB and OJ. Posttreatment CBCTs confirmed improved condylar morphology.Occlusal splint therapy followed by orthodontic molar intrusion provides MI-CR harmony, therefore, it seems to be an effective method for treating TMD patients.

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Allen, Kevin, Parker Sheehan, Ruby Bolla, Kathy Mah und Erler Darby. „Quality Assessment of Turbo CBCT for Lung SBRT“. Journal of Medical Imaging and Radiation Sciences 47, Nr. 1 (März 2016): S1. http://dx.doi.org/10.1016/j.jmir.2015.12.005.

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Trindade, Hugo, Inês Morais und Abigail Moreira. „EXTRAORAL AND CBCT DENTAL EXPOSURES IN PORTUGAL“. Radiation Protection Dosimetry 190, Nr. 3 (Juli 2020): 283–88. http://dx.doi.org/10.1093/rpd/ncaa102.

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Abstract Data from dental extraoral and cone beam computed tomography (CBCT) exposures in Portugal (2019) were gathered, and patient doses for standard adult exams were evaluated. In panoramic X-rays, 442 units (34% of the existing licensed units) were tested, with a third quartile value (PKA) of 82 mGy.cm2. For cephalometric radiography (88 units), the third quartile value (Ki) was 0.3 mGy for the posteroanterior projection and 0.2 mGy for lateral projection. In CBCT (69 units), the doses for the placement of an upper first molar implant were evaluated with a third quartile value (PKA) of 820 mGy.cm2. Due to the wide range of values (74–3687 mGy.cm2), the CBCT data were divided by FOV dimensions: for small FOV (average FOV of 7 ×8 cm), a value of 580 mGy.cm2 was obtained and for medium FOV (average FOV of 13 × 12 cm) a value of 1167 mGy.cm2. The number of annual panoramic X-rays made in Portugal was 208 per 1000 inhabitants, which is higher than the value for other countries.

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Cabanas, Ana M., Mauricio Arriagada-Benítez, Carlos Ubeda, Oliver Meseguer-Ruiz und Pedro Arce. „Dose Estimation by Geant4-Based Simulations for Cone-Beam CT Applications: A Systematic Review“. Applied Sciences 11, Nr. 13 (01.07.2021): 6136. http://dx.doi.org/10.3390/app11136136.

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The last two decades have witnessed increasing use of X-ray imaging and, hence, the exposure of humans to potentially harmful ionizing radiation. Computed tomography accounts for the largest portion of medically-related X-ray exposure. Accurate knowledge of ionizing radiation dose from Cone-Beam CT (CBCT) imaging is of great importance to estimate radiation risks and justification of imaging exposures. This work aimed to review the published evidence on CBCT dose estimation by focusing on studies that employ Geant4-based toolkits to estimate radiation dosage. A systematic review based on a scientometrics approach was conducted retrospectively, from January 2021, for a comprehensive overview of the trend, thematic focus, and scientific production in this topic. The search was conducted using WOS, PubMed, and Scopus databases, according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. In total, 93 unique papers were found, of which only 34 met the inclusion criteria. We opine that the findings of this study provides a basis to develop accurate simulations of CBCT equipment for optimizing the trade-off between clinical benefit and radiation risk.

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Liu, Liang, Xinxin Li, Kai Xiang, Jing Wang und Shan Tan. „Low-Dose CBCT Reconstruction Using Hessian Schatten Penalties“. IEEE Transactions on Medical Imaging 36, Nr. 12 (Dezember 2017): 2588–99. http://dx.doi.org/10.1109/tmi.2017.2766185.

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Kamburoğlu, Kıvanç, Eray Kolsuz, Hakan Kurt, Cenk Kılıç, Tuncer Özen und Candan Semra Paksoy. „Accuracy of CBCT Measurements of a Human Skull“. Journal of Digital Imaging 24, Nr. 5 (21.09.2010): 787–93. http://dx.doi.org/10.1007/s10278-010-9339-9.

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Lu, Ke, Lei Ren und Fang-Fang Yin. „A geometry-guided deep learning technique for CBCT reconstruction“. Physics in Medicine & Biology 66, Nr. 15 (30.07.2021): 15LT01. http://dx.doi.org/10.1088/1361-6560/ac145b.

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Bujtar, Peter, Janos Simonovics, Sandor George, Karoly Varadi, Avery Christopher, Attila Szucs, Attila Bojtos, Wilson Otto Batista, Gergely Zombori und Jingzhe Pan. „Emerging computer bioengineering technologies 1: Scanning (CBCT versus MSCT), modelling (bio-CAD) and functional simulation (FEA): Steps towards validation“. British Journal of Oral and Maxillofacial Surgery 52, Nr. 8 (Oktober 2014): e71. http://dx.doi.org/10.1016/j.bjoms.2014.07.086.

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Pham, Khoa Van. „A Comparison of Cone Beam Computed Tomography and Periapical Digital Radiography for Evaluation of Root Canal Preparation“. Applied Sciences 11, Nr. 14 (18.07.2021): 6599. http://dx.doi.org/10.3390/app11146599.

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The aim of the present study is to compare cone beam computed tomography and periapical digital radiography for the evaluation of root canal preparation. Nine extracted human molars were used in this study. Following access cavity preparation, mesio-buccal roots of maxillary and mesial roots of mandibular molars were prepared and the remaining roots were cut off. Three amalgam cavities were prepared on the coronal part of the teeth and were filled with amalgam to be used as landmarks. Specimens were scanned using cone-beam computed tomography and periapical digital radiograph images were obtained before and after root canal preparation. WaveOne Gold Primary was used for root canal preparation to full working length. Specimens were then scanned using CBCT and a periapical radiograph for the after-instrumentation images. The transportation and centering ratio were measured and calculated on the CBCT and periapical radiographic images. The Bland–Altman method was used for detecting the bias in the evaluation of agreement between the two methods’ measurements. There was agreement between the two methods’ measurements using CBCT scans and periapical digital radiographic images in the evaluation of transportation and centering ratio parameters. The two methods could be used interchangeably in measurements of transportation and calculating the centering ratio.

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Carvalho, Rosany Laurentina Santos de, Flavia de Lima Cavalcanti Spinelli, Luciana Sarmento de Mendonça, José Alcides Almeida de Arruda, Amália Moreno, Pamella Recco Alvares, Cleomar Donizeth Rodrigues, Ana Paula Veras Sobral und Marcia Maria Fonseca da Silveira. „Detection of vertical root fractures in the presence of artefacts by digital radiography and cone beam computed tomography“. Research, Society and Development 10, Nr. 10 (10.08.2021): e284101018393. http://dx.doi.org/10.33448/rsd-v10i10.18393.

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The correct diagnosis of vertical root fractures (VRF) in the presence of artifacts is a challenge for clinicians and endodontists. Moreover, there is controversy about which imaging technique is best for this purpose. In an in vitro model, we evaluated the diagnosis of VRF in teeth treated endodontically with and without intraradicular metal posts, using the Clark technique and cone beam computed tomography (CBCT), as well as the interference of artifacts with the diagnosis. Twenty-two first or second maxillary or mandibular premolars were included. Teeth were randomly allocated to three groups: G1 (two teeth without fracture with endodontic treatment and one with an intraradicular metal post); G2 (10 fractured teeth with endodontic treatment); and G3 (10 fractured teeth with endodontic treatment plus a metal post). The examiners recorded the presence or absence of fracture and its location and classified its type. There was no statistically significant difference between image acquisition systems. When differentiating the teeth (first vs. second premolars), there was a statistically significant difference among the examiners (p=0.020). However, when comparing the values obtained by the examiners regarding the visualization of the fracture site as well as the presence of fracture correlated with the presence of a metal post and angulation, there were no statistically significant differences (p>0.05). Digital radiographs and CBCT were similar for the diagnosis of VRF. High sensitivity was observed by CBCT image reconstructions. Therefore, the presence of metal posts generated artifacts, resulting in low sensitivity, specificity and accuracy.

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Patel, Ruchir, Tejal Sheth, Shilpi Shah und Mihir Shah. „A New Leap in Periodontics: Three-dimensional (3D) Printing“. Journal of Advanced Oral Research 8, Nr. 1-2 (Mai 2017): 1–7. http://dx.doi.org/10.1177/2229411217729102.

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Dentistry is truly a great profession and recently it is coming to the terms of use of technology and tech-savvy dentists, who nowadays use smart devices to make their life easier. Researchers are constantly innovating to integrate techno-logy into dentistry. Of all the latest technological innovations in dentistry, the most talked about innovations are three-dimensional (3D) printing and cone beam computed tomography (CBCT), which have made the treatment planning and execution a whole lot easier. Three-dimensional printing like CBCT has been gaining much popularity in the masses. Three-dimensional printing technologies are evolving rapidly in the recent years and can be used with a wide array of different materials. In addition to rapid prototyping, the dominant use in the past, they are now being used in all manner of manufacturing applications in a diversity of industries such as sports goods, fashion items such as jewelry and necklaces to aerospace components, tools for automobile industry, and medical implants also in dentistry for producing models, making scaffolds, etc. In future, 3D printing has ability to change the way many products are manufactured and produced and bring an era of ‘personal manufacturing’. This article introduces 3D printing and gives little information about the technology behind the working of 3D printers. It also gives information about the applications of 3D printers and materials most often used for 3D printed scaffolds for periodontal regeneration.

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Park, Chang-Seo, Jae-Kyu Park, Huijun Kim, Sang-Sun Han, Ho-Gul Jeong und Hyok Park. „Comparison of conventional lateral cephalograms with corresponding CBCT radiographs“. Imaging Science in Dentistry 42, Nr. 4 (2012): 201. http://dx.doi.org/10.5624/isd.2012.42.4.201.

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Sicoe, Casian Teodor, Cătălina Bichir und Mugurel Constantin Rusu. „The Optic Strut—CBCT Pneumatization Pattern and Prevalence“. Applied Sciences 11, Nr. 13 (22.06.2021): 5797. http://dx.doi.org/10.3390/app11135797.

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(1) Background: The optic strut (OS) is a critical landmark for clinoid and paraclinoid surgical interventions. To our knowledge, the current literature only mentioned the OS as a possibility for a lesser sphenoidal wing (LSW) pneumatization path, without a proper study of the pneumatization patterns and prevalence within this structure. Thus, our aim was to fill in the missing information. (2) Methods: A retrospective study on 80 cone beam computed tomography (CBCT) files was conducted to assess the prevalence and the origins of pneumatization within the OS. (3) Results: The pneumatization patterns of the OS were: 56.25% from the sphenoid sinus, 1.25% from the posterior ethmoid air cells (PEAC), and 10% from Onodi cells (ONC). Simultaneous pneumatization of unique origin within the lesser sphenoidal wing (LSW) was found in 26.25% from the sphenoid sinus, 1.25% from PEAC, and 5% from ONC. Communication between both LSW roots through pneumatization was found in 6.25% of the files. (4) Conclusions: A careful radiological examination should precede clinical diagnosis and surgical interventions in the paraclinoid area to evaluate postoperative surgical risks and possible diffusion patterns for infection. Additionally, pneumatization within the OS alters its morphological features and thus, its utility as a landmark.

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Chen, Liyuan, Xiao Liang, Chenyang Shen, Dan Nguyen, Steve Jiang und Jing Wang. „Synthetic CT generation from CBCT images via unsupervised deep learning“. Physics in Medicine & Biology 66, Nr. 11 (31.05.2021): 115019. http://dx.doi.org/10.1088/1361-6560/ac01b6.

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Heft, M. W., C. H. Fox und R. P. Duncan. „Assessing the Translation of Research and Innovation into Dental Practice“. JDR Clinical & Translational Research 5, Nr. 3 (07.10.2019): 262–70. http://dx.doi.org/10.1177/2380084419879391.

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Introduction: Over the past 100 y, there have been an unprecedented number of innovations that have improved oral health and functioning. Variations in lag times between discovery and clinical adoption are related to dentist education, the clinical availability of technology, and the perceived value of an innovation. Objectives: The purposes of this cross-sectional study were 1) catalogue research discoveries and innovations over the past 30 y and 2) from that list identify those which practicing dentists believe have maximally affected patient care. Methods: Thirty International Association for Dental Research leaders identified innovations over the past 30 y that have significantly affected dental care. The 30 most cited innovations were included in a questionnaire that was sent to a random sample of US dentists who graduated dental school during or before 1995 (before the recency of identified discoveries) and devoted ≥50% of their time to patient care. Eighty-two percent of respondents identified as general dentists and 18% as specialists. Respondents were asked to identify 5 to 7 items whose loss would have the most adverse effects on patient care. Results: The most cited advances were adhesive dental materials (74.5%), dental implants (71.9%), direct bonding systems (71.2%), dental loupes (54.7%), universal precautions for infection control (48.6%), and digital imaging (46.0%). There were differences in the ranking of responses between generalists and specialists. For the oral surgeons and periodontists (OMSPER, n = 51), top choices were dental implants (82%), cone beam computed tomography (CBCT) imaging (74%), regenerative dentistry and tissue engineering (68%), universal precautions (58%), digital imaging (56%), and dental loupes (48%). Conclusions: There was agreement among generalists and specialists about the importance of dental implants, digital imaging, use of dental loupes, and universal precautions in improving patient care. However, generalists also cited the importance of adhesive dental materials and bonding, and OMSPER cited CBCT and biological-based tissue restoration as major advances. Knowledge Transfer Statement: Many advances in dental patient care capitalize on innovations and technologies that have emerged after dentists graduate from dental school. Adoption of new technologies is influenced by information acquired from professional journals, continuing education, industry marketing activities, and interactions with colleagues. The results of this study suggest that innovations that are directly related to clinical procedures were rated most impactful. Future research should consider cost-effectiveness and patient perceptions on the impact of innovations and technologies.

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Eskandarloo, Amir, und Faezeh Yousefi. „CBCT findings of periapical cemento-osseous dysplasia: A case report“. Imaging Science in Dentistry 43, Nr. 3 (2013): 215. http://dx.doi.org/10.5624/isd.2013.43.3.215.

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Li, Yang, Yoshiki Kubota, Mutsumi Tashiro und Tatsuya Ohno. „Value of Three-Dimensional Imaging Systems for Image-Guided Carbon Ion Radiotherapy“. Cancers 11, Nr. 3 (02.03.2019): 297. http://dx.doi.org/10.3390/cancers11030297.

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Carbon ion radiotherapy (C-ion RT) allows excellent dose distribution because of the Bragg Peak. Compared with conventional radiotherapy, it delivers a higher dose with a smaller field. However, the dose distribution is sensitive to anatomical changes. Imaging technologies are necessary to reduce uncertainties during treatment, especially for hypofractionated and adaptive radiotherapy (ART). In-room computed tomography (CT) techniques, such as cone-beam CT (CBCT) and CT-on-rails are routinely used in photon centers and play a key role in improving treatment accuracy. For C-ion RT, there is an increasing demand for a three-dimensional (3D) image-guided system because of the limitations of the present two-dimensional (2D) imaging verification technology. This review discusses the current imaging system used in carbon ion centers and the potential benefits of a volumetric image-guided system.

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Hayes, Christine, Lisa Jaegers, Brittany Conners und Karen Barney. „Telehealth Technologies Support Participation in Community-Based OT (CBOT) Services During Postjail Transition and Integration“. American Journal of Occupational Therapy 73, Nr. 4_Supplement_1 (01.08.2019): 7311515376p1. http://dx.doi.org/10.5014/ajot.2019.73s1-po6035.

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Kim, Hee Jin, Ye Joon Jo, Jun Seok Choi, Hyo Joon Kim, Jin Kim und Seong Yong Moon. „Anatomical Risk Factors of Inferior Alveolar Nerve Injury Association with Surgical Extraction of Mandibular Third Molar in Korean Population“. Applied Sciences 11, Nr. 2 (16.01.2021): 816. http://dx.doi.org/10.3390/app11020816.

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The purpose of this study was to analyze the incidence and risk factors of possible inferior alveolar nerve (IAN) injury after extraction of the mandibular third molars. A total of 6182 patients were examined for 10,310 mandibular third molar teeth. Panoramic radiography and patients’ medical records were used to analyze age, gender, and impaction pattern of the mandibular third molar. Cone beam computed tomography (CBCT) was used to investigate the detailed pathway of the inferior alveolar nerve and evaluated the presence of symptoms of nerve damage after tooth extraction. In CBCT, 6283 cases (61%) of the inferior alveolar nerve were actually in contact with the root of the mandibular third molar. The correlation with the panoramic signs of root darkening (p < 0.001), root deflection (p < 0.001), interruption of the IAN (p < 0.001), diversion of the IAN (p < 0.001), and narrowing of the IAN (p < 0.001) had statistical significance. Of the 4708 patients who underwent surgical extraction, 31 (0.658%) complained of nerve damage. Among them, 30 patients (0.637%) complained of symptoms of inferior alveolar nerve damage, and 1 patient (0.02%) complained of symptoms of lingual nerve damage. There was a significant correlation with IAN injury in cases where the roots became dark at the IAN area (p = 0.018) and there was diversion of the IAN at the root area (p = 0.041). When the narrowing of the IAN and the lingual driving pathway of the inferior alveolar nerve appeared simultaneously in CBCT, the risk of IAN injury was high.

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Demiralp, Kemal Osgur, Kaan Orhan, Emine Şebnem Kurşun-Çakmak, Cansu Gorurgoz und Seval Bayrak. „Comparison of Cone Beam Computed Tomography and ultrasonography with two types of probes in the detection of opaque and non-opaque foreign bodies“. Medical Ultrasonography 20, Nr. 4 (08.12.2018): 467. http://dx.doi.org/10.11152/mu-1562.

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Aim: The aim of this study was to compare the diagnostic accuracy of intra-oral and extra-oral ultrasonographic (US) examinations performed with linear and convex probes in the detection of opaque and non-opaque foreign bodies (FBs) located in the maxillofacial area.Materials and methods: Thirteen different type of FBs were inserted into a sheep’s head: a) on the external bone surface of mandible (between the mandibular corpus and masseter muscle), b) in the intrinsic muscular tissue (in the dorsum of the tongue) and c) in the hollow structures (into the maxillary sinus of the sheep’s head). The FBs in muscle tissue were scanned intra-orally whereas FBs in bone external bone surface of mandible and in maxillary sinus were scanned both intra-orally and extra-orally. The sensitivity of cone beam computed tomography (CBCT) and US imaging methods in detection of FBs were compared for FBs on the bone surface and in the muscular tissue.Results: The intra-observer kappa coefficients provided identical values of 0.236 for the extra-oral convex probe, 0.461 for the intra-oral linear probe for overall FBs detection, which indicated notably poor to fair intra-observer agreement. The inter-observer agreement showed a poor agreement for the extra-oral use of linear probe (0.341 and 0.393) and extra-oral use of convex probe (0.319 and 0.335), However, a fair agreement was determined for use of probe intra-orally (0.530 and 0.534). Overall, the diagnostic accuracy of the CBCT was higher than the US regarding the visualization of FBs in the bone tissue.Conclusion: US with a linear probe should be the first choice for the detection of the low-radiodensity FBs, which are entrapped in the soft tissue. However, CBCT is a more sensitive technique for the visualization of FBs in air and bone tissue compared to the US, particularly for the diagnosis of high-radiodensity FBs.

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Xia, Dan, David A. Langan, Stephen B. Solomon, Zheng Zhang, Buxin Chen, Hao Lai, Emil Y. Sidky und Xiaochuan Pan. „Optimization-based image reconstruction with artifact reduction in C-arm CBCT“. Physics in Medicine and Biology 61, Nr. 20 (03.10.2016): 7300–7333. http://dx.doi.org/10.1088/0031-9155/61/20/7300.

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