Academic literature on the topic 'CBCT technologie'
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Journal articles on the topic "CBCT technologie"
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Jonczyk, M., F. Collettini, D. Geisel, D. Schnapauff, G. Böning, G. Wieners, and G. Gebauer. "Radiation exposure during TACE procedures using additional cone-beam CT (CBCT) for guidance: safety and precautions." Acta Radiologica 59, no. 11 (February 28, 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, and Alexandra Moga. "Applications of Imaging Technologies in Maxillary Cyst Assessment." Revista de Chimie 68, no. 5 (June 15, 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, and Florian M. Thieringer. "Comparative Evaluation of Digitization of Diagnostic Dental Cast (Plaster) Models Using Different Scanning Technologies." Dentistry Journal 8, no. 3 (August 2, 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, and Marco Felipe Salas Orozco. "Imaging technologies for the detection of sinus pathologies of odontogenic origin. A review." Revista Científica Odontológica 9, no. 1 (March 12, 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, and 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, no. 1 (February 13, 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, and Martin Jonczyk. "Semi-automatic prostatic artery detection using cone-beam CT during prostatic arterial embolization." Acta Radiologica 61, no. 8 (December 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, and Gabriella Galluccio. "CBCT and Intra-Oral Scanner: The Advantages of 3D Technologies in Orthodontic Treatment." International Journal of Environmental Research and Public Health 17, no. 24 (December 16, 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, and Wataro Tsuruta. "ESTIMATION OF PATIENT LENS DOSE ASSOCIATED WITH C-ARM CONE-BEAM COMPUTED TOMOGRAPHY USAGE DURING INTERVENTIONAL NEURORADIOLOGY." Radiation Protection Dosimetry 184, no. 2 (November 17, 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, and Jan Wolff. "Influence of CT parameters on STL model accuracy." Rapid Prototyping Journal 23, no. 4 (June 20, 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, no. 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.
Dissertations / Theses on the topic "CBCT technologie"
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Octave, Nadia. "La radiothérapie adaptative et guidée par imagerie avec la technologie Cone-Beam CT : mise en oeuvre en vue du traitement de la prostate." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30207/document.
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L'imagerie est maintenant partie intégrante des traitements de radiothérapie. Avec la technologie CBCT embarquée sur les appareils de traitement, l'imagerie tomographique permet non seulement de repositionner fidèlement le patient tout au long de son traitement mais aussi d'adapter la planification initiale aux modifications quotidiennes de volume. C'est la radiothérapie adaptative, objet des travaux de cette thèse. Nous avons établi les limites techniques de précision de repositionnement des équipements utilisé. Ensuite, à partir des acquisitions CBCT quotidiennes de patients traités pour la prostate, nous avons élaboré une stratégie de traitement basée sur une banque de plans personnalisés. Nous avons mis au point une méthode semi-automatique de sélection du plan de traitement du jour qui a montré une efficacité supérieure à la sélection par des opérateurs expérimentés. Enfin, nous avons quantifié les doses additionnelles à la dose thérapeutique associées à l'utilisation quotidienne de l'imagerie CBCT. En conclusion, on peut dire qu'avec l'imagerie CBCT embarquée, on peut voir ce que l'on veut traiter, irradier ce que l'on a vu et contrôler ce qu'on a traitéImaging is now fully integrated in the radiation therapy process. With on-board CBCT systems, tomography imaging allows not only patient positioning but also treatment planning adaptation with patient anatomy modifications, throughout the entire treatment. This is called adaptive radiation therapy, and is the main subject of this PhD thesis. During this work, we measured the repositioning accuracy of the system used. We also developed a treatment strategy using daily CBCT images and a personalized plan database to adapt treatment plan to patient anatomy. We found a way to select the daily treatment plan that shows superiority over operator selection. Then we also quantified the additional dose delivered while using this technique and the impact with regards to the risks added to patients. As a conclusion, with CBCT imaging, radiation therapy has entered an era where one can see what need to be treated, can treat what has been seen and can control what has been treated
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Ondrová, Martina. "Design dentálního panoramatického rentgenu s 3D zobrazením." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444989.
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The topic of this thesis is the design of dental X-ray. User problems were identified based on the design and technical analysis for which solutions are presented in the work. The innovative shape and design solution shows a new approach to dental X-rays. The main benefit of the design is the solution to real ergonomic problems that can occur during the interaction of the operator or patient and the device. The design corresponds to current trends in the evolving design field of medical design.
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Lemammer, Imane. "Calibration en ligne d'un C-arm mobile à l'aide de capteurs inertiels pour des applications en CBCT." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT039.
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Les images acquises par tomographie volumique à faisceaux coniques (CBCT) sont plus précises que celles de la radiologie classique tout en produisant 1.5 à 12 fois moins de rayons X. Ces bonnes précisions en font un outil intéressant ce qui concerne le diagnostic et la planification d’interventions chirurgicales. Ce n'est que récemment que son usage est entré dans la pratique pour des chirurgies lourdes, avec l'introduction de systèmes d'imagerie par radiographie dédiés, coûteux et encombrants. Une idée pour généraliser son utilisation à des chirurgies mineures, en orthopédie ou en traumatologie par exemple, serait de l’implanter sur le dispositif d’imagerie radiologique médicale le plus répandu en salle d’opération : l’arceau chirurgical mobile (C-arm).Cependant, le C-arm est incompatible avec les algorithmes de tomographie volumique de l’état de l’art qui nécessitent une connaissance très précise de la géométrie de l'image. En effet, un C-arm est mécaniquement instable et ses trajectoires sont non répétables. De plus, les algorithmes de calibration géométrique du C-arm mobile de l’état de l’art ne répondent pas aux exigences de cet usage : invasivité, modification trop importante de la routine chirurgicale, précision de localisation insuffisante… Dès lors, nous avons mis en évidence l’intérêt d’implanter une nouvelle méthode de calibration en ligne non invasive du C-arm. Pour ce faire, nous avons choisi d’exploiter principalement des mesures issues de capteurs inertiels.Pour répondre à cette problématique, nous abordons deux points : La construction d’un algorithme de calibration : l’idée est d’estimer la position et l’orientation du couple source-détecteur du C-arm mobile à partir des mesures inertielles et de modèles cinématiques adaptés, et grâce à des estimateurs (filtres et lisseurs de Kalman) correctement paramétrés. La propagation des erreurs d’estimation de positions et d’orientations jusqu’aux projetés 2D puis jusqu’aux reconstructions 3D : le but est d’évaluer l’impact des erreurs de localisation sur la qualité de reconstruction tout en permettant de déterminer les paramètres les plus impactants.Afin de valider le dispositif de calibration proposé, deux plateformes expérimentales ont été construites dans le cadre cette thèse : un bras rotatif qui permet de reproduire les mouvements de la source à rayons X ou du détecteur du C-arm dans le cas de trajectoires simplifiées, motorisées et répétables, et un C-arm réel qui a été sécurisé et motorisé, puis équipé de capteurs. Ce dernier nous a permis d’estimer la précision de localisation du couple source-détecteur pour des trajectoires réalistes.Sur une trajectoire classique d’un système réel, les erreurs maximales de calibration obtenues sont de l’ordre de 2 mm pour les positions et du dixième de degré pour les rotations. Ces résultats sont comparables à ceux obtenus par les méthodes de calibration invasives de l’état de l’art. La qualité de reconstruction a été évaluée sur des projetés 2D sur le plan détecteur puis sur des coupes de reconstructions 3D de mires et de fantômes réels. La précision sur l’orientation obtenue est évaluée comme étant suffisante pour garantir une bonne qualité de reconstruction. La précision sur la position est cependant jugée insuffisante. Néanmoins, les reconstructions obtenues, bien que visuellement déformées, gagneraient à être présentées et évaluées par un spécialiste médical. Les algorithmes de propagation d’erreurs ont également permis de conclure qu’une erreur sur les translations dans le plan de la source et du détecteur du C-arm ont, au moins, 6 fois plus d’impact sur les reconstructions que des erreurs sur les autres paramètres géométriques du C-armCone beam computed tomography (CBCT) is more accurate than conventional radiography with less radiation exposure doses. Hence, it is a very useful complementary tool for diagnosis and surgery planning. Despite the increasing popularity of CBCT, it is mainly restricted to major surgery as it requires the use of expensive and bulky angiography systems which are specially designed to allow 3D tomography. One idea to generalize the use of CBCT to minor surgery - in orthopedics and traumatology for example - would be to introduce it on the most widely used tool for X-ray imaging: the mobile C-arm.Volume reconstruction algorithms require a very precise knowledge of the imaging geometry. Unfortunately, due to mechanical instabilities which lead to non-reproducible motions from run to run mobile C-arms are incompatible with existing tomography algorithms. Therefore, a precise C-arm on-line calibration is essential in order to achieve an accurate volume reconstruction. Existing calibration techniques do not meet these specifications. They are either not precise enough, invasive or involve a major change in the process of performing surgical acts. Therefore, we present a new on-line calibration method for mobile C-arms in order to achieve CBCT. It is based on tracking the detector and the X-ray source of the C-arm and aims to be precise and non-invasive.In order to address this issue, we will discuss two items: The first is the construction of a calibration algorithm: the idea is to estimate the position and the orientation of the detector and the X-ray source of the C-arm using inertial measurements, appropriate kinematic models, and a fitting estimator (Kalman filter and smoother). The second item is the propagation of pose estimation errors to 2D projections and to 3D reconstructions. Thus, we can evaluate the impact of the estimation errors on the reconstruction quality.This thesis also describes two experimental setups which allowed us to test and validate the proposed calibration algorithm. The first tracking experiments were carried out on a rotated-arm. It is a simple motorized mock-up to simulate either the detector or the X-ray source of a mobile C-arm. The rotated-arm exhibits a good position and orientation repeatability. The second platform is a full-size modified mobile C-arm. It includes motorized orbital and axial rotations, mechanical end stops and sensors of different characteristics and accuracies. This second platform allows us to estimate the geometric calibration accuracy on realistic trajectories.During a continuous rotation of the experimental C-arm, we achieve a tracking error of 2 mm for positions and of 0.1° for orientation. These values are comparable with existing invasive calibration algorithms accuracies. The image quality of reconstructed CBCT using the proposed calibration algorithm was evaluated on the 2D projections within the detector plane and also on the 3D reconstruction images of various phantoms. The achieved orientation accuracy is sufficient for CBCT. The position accuracy seems not. However, it may be useful to present the resulting 3D reconstruction images to medical evaluation by a specialist to confirm these conclusions. It also appears that the parameters of C-arm's projective geometry which have the greatest impact on the 2D projections are the in-plane translations of the X-ray source and of the detector. Therefore, they are the most critical parameters to be efficiently tracked in order to avoid artifacts in the 3D volume reconstruction. Compared to in-plane translations, the out-plane translations and the orientation of the detector have little influence on the 2D projections
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Gianquinto, Jared Robert. "A Method of Superimposition of CBCT Volumes in the Posterior Cranial Base." Master's thesis, Temple University Libraries, 2011. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/210320.
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Oral BiologyM.S.
Three dimensional imaging in the form of Cone Beam Computed Tomography has become prevalent in the field of orthodontics. Analytical methods of resulting volumetric data sets have not kept pace with the technology capable of producing them. Current 3D analysis techniques are largely adaptations of existing 2D methods, offering no clear diagnostic advantage over traditional imaging techniques in light of increased radiation exposure, and cannot be compared with norms generated from 2D image capture sources. In order to study morphology in 3D, data sets must be generated for longitudinal studies and native 3D analytical methods must also be developed. Existing methods of CBCT volume superimposition are cumbersome, involving complex software pipelines and multiple systems to complete the process. The goal of the current study was to develop a reproducible method of CBCT volume superimposition in the posterior cranial base in a single software package, and construct an easy to follow, step-by-step manual to facilitate future studies in craniofacial morphology. Existing anonymized sequential CBCT volumes of three subjects meeting inclusion criteria were obtained from the Kornberg School of Dentistry Department of Radiology. Volumes for each subject were imported into AMIRA software, resampled to a standardized 0.5 mm voxel size and superimposed with a mutual information algorithm. Posterior cranial base surface data was extracted using a semi-automatic technique. Resulting surface distance data was compiled and visualized through application of color maps. A streamlined image processing protocol was produced and documented in a detailed step-by-step manual. Surface distance analysis of serial segmentations was performed to verify reliability of the process. Surface distance deviations greater than 0.5 mm consistently fell below 0.2 percent of the total surface area. Sequential scan superimpositions of all three subjects exhibited mean surface distances of less than 0.15 mm. Two out of three subjects exhibited deviations of greater than 0.5 mm in less than 1 percent of the total surface area, suggesting consistent sub-voxel accuracy of the protocol.
Temple University--Theses
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Warnock, Sarah M. "Cortical Bone Mechanics Technology (CBMT) and Dual X-Ray Absorptiometry (DXA) Sensitivity to Bone Collagen Degradation in Human Ulna Bone." Ohio University Honors Tutorial College / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1556305540256918.
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Hanci, Arzu. "The Effect Of Individual Differences On Acceptance Of Web-based Learning Management System: A Case Of The Central Bank Of The Republic Of Turkey." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608823/index.pdf.
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The aim of this study is to investigate the effect of Bank employees&rsquoindividual and organization related individual differences on the acceptance of Learning Management System (LMS) in Central Bank of the Republic of Turkey (CBRT). The study aims to find out whether there are differences in perceived ease of use of technology, perceived usefulness of technology, and attitudes toward the use of LMS in terms of Bank employees&rsquo
gender, age, seniority, title, department, and LMS role groups. Survey design was used in this thesis study. Two self-report questionnaires were developed on LMS acceptance for two different LMS role groups. Accordingly, these questionnaires were distributed to department managers, training experts, training researchers, office staff and participants of training programs who have experienced LMS recently in the CBRT. 167 participants, and 64 department managers and office users responded the survey significantly. The data gathered via questionnaires was analyzed with the SPSS program, using descriptive and inferential statistics where correlation analysis and ANOVA were conducted. The results of the study showed that age and seniority of &ldquo
participants&rdquo
affect the participants&rsquo
acceptance of LMS
in particular they affect the perceived usefulness of LMS. Furthermore, the department of &ldquo
department managers and office users&rdquo
affects their acceptance of LMS regarding perceived usefulness, perceived ease of use, and attitudes toward the use of LMS. Consequently, the results of this case study can contribute to the literature regarding the determinants of technology acceptance factors.
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Danieliūtė, Vaida. "Informacinių technologijų taikymas logopedų darbe." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130730_105233-29791.
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Magistro darbe analizuojamas informacinių technologijų taikymas Lietuvos logopedų darbe. Apie IKT ir KMP taikymą Lietuvos logopedų darbe nėra daug žinoma, nėra parengta išsamių mokslinių straipsnių ar apžvalgų, kurie nurodytų, kokiomis informacinių technologijų programomis ar priemonėmis naudojamasi logopedų darbe, kokios iš jų vyrauja ir kurios yra efektyviausios dirbant su kalbos, kalbėjimo ir komunikacijos sutrikimų turinčiais asmenimis. Praktinis tyrimo naudingumas – atskleisti informacinių technologijų taikymo realybę logopedų darbe su kalbėjimo ir kalbos sutrikimų turinčiais asmenimis. Palyginti pasiekimus šioje srityje Lietuvoje ir užsienio šalyse. Prieduose pateikiamas internetinių svetainių sąrašas, kur galima rasti logopedinėse pratybose pritaikomų lavinimo užduočių.Master’s thesis analyzes the informational technologies application in Lithuanian speech and language therapists’ work. The aim of this research - to assess the informational and communication technology (ICTs) and computer-based speech training system (CBST) use at the speech and language therapists work in comprehensive schools who work with persons who have language, speech and communication disorders. The empirical part of the paper deals with the use of ICTs/ CBST at speech and language therapists work, their possibility of usage, the coherence between speech therapists qualification and their age, the usage of the programs for development educable self-dependent tools, speech and language therapists interest in various sources of work-related topics and others. In the questionnaire survey (in electronic form) have participated 258 speech and language therapists who work in comprehensive schools.
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Alsharif, Abdulla H. "Intelligent M-Health-CBT combined technology for an enhanced smoking cessation management system using data mining techniques with a case study in Saudi Arabia." Thesis, Kingston University, 2016. http://eprints.kingston.ac.uk/37875/.
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Smoking has become one of the major global health concerns. Though there are various awareness activities being undertaken, the prevalence of smoking across the world is increasing at alarming levels. However, the extent of this increase varies among different countries. Even in culturally rich countries where smoking is considered as antagonistic behaviour both religiously and culturally, like Saudi Arabia, the prevalence of smoking is increasing at alarming levels. As smoking is mostly a behavioural aspect bundled with other factors, CBT (Cognitive Behavioural Therapy) integrated with m-health technologies represents a good strategy towards smoking cessation. This study focuses on developing a mobile smoking cessation management system - SMOKE MIND - using CBT intervention, and assessing its impact on achieving smoking cessation. This study uses mixed methods approach, where different methods are used at different stages of the research. Based on the systematic reviews and other literature reviewed, a questionnaire-based survey is conducted to assess the requirements of smokers in Saudi Arabia regarding the system for smoking cessation. The system developed uses CO readings of smokers, entered daily by participants through the mobile application, and assesses their improvement. Additionally, smokers enter CBT data if their CO readings are high, also through the mobile application. Based on these readings and CBT data, physicians recommend various activities and send motivational messages. The system is trailed for four weeks with an intervention group, who had access to the system, and a control group who did not. At the end of the study, another survey is conducted for evaluating the usability aspects of the SMOKE MIND system. The results achieved at the end of the study in evaluating the SMOKE MIND System reflect significant improvements in the participants in quitting smoking, and high satisfaction levels of the participants using the system. The values of p in both one-talied (0.0061) and two tailed (0.01) t-test are < 0.05, indicating that results are significant. 81.8% of the participants in intervention group and 40% participants in the control group quit smoking at the end of the study. A majority of the participants were highly satisfied with the various features used in the SMOKE MIND System.
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Shahzad, Muhammad, and Shahid Javed. "IMPROVING EDUCATION THROUGH E LEARNING." Thesis, Högskolan i Borås, Institutionen Handels- och IT-högskolan, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17266.
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Information Communication Technologies (ICT) are taking pace with rapid development,with the strive to impart education among learners in a way that they become highly satisfied.With a help of different electronic tools in educational technology using media and makingright environments to enhance learning, develop creativity, stimulate communication, createchannels for collaboration, and hence, engaging in the continued development and applicationto knowledge and skills. Usage of technology spans across all academic areas with theincreasing popularity of information technology that is evolving rapidly towards bettermentwith increased capabilities every day. Educationalists are interested in knowing howtechnology would create a variation for the students in the classroom. The purpose of using ELearningis to create a learning platform with combination of the existing knowledge andInformation Communication Technologies (ICT). High growth in Information Technology thatis user friendly, accessible, and reliable at the same time providing improved ways incollaborating in a new approach possible. Students from different units would be able tocollaborate forming cross-unit teams and working on common or multiple assignmentshelping each other in different ways. Internet, video conferencing, and emails are wellestablished collaborative tools for exchange of information. Investigating that why there is aneed of technology in the education and which technologies would help in improving learningprocesses is the main purpose of this research. And also to find that what would be thenecessary infrastructure required to get facilitated by this technology. The research revolvesaround the theory of Computer Based Training (CBT) which refers to particular part of theinstructional development or educational media.Program: Magisterutbildning i informatik
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Dunne, Nivek. "Evaluation of psychology clinicians' attitudes towards computerised cognitive behaviour therapy, for use in their future clinical practice, with regard to treating those suffering from anxiety and depression." Antioch University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=antioch1503328670275243.
Full textBooks on the topic "CBCT technologie"
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Palmer, Richard. What is CBT interactive video? Manchester: NCC Publications, 1987.
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Age, Inc PC. MCSE CBT Microsoft Windows NT Server 4.0-Enterprise Technologies (test# 70-068). PC Age, Inc., 1998.
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Computer Based Training in der Medizin: Technik - Evaluation - Implementation. Aachen, NRW, Germany: Shaker Verlag, 1998.
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Muroff, Jordana, Abigail Ross, and Joseph Rothfarb. Additive and Alternative Approaches to Treating Obsessive Compulsive Disorder. Edited by Gail Steketee. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780195376210.013.0086.
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While cognitive-behavioral therapy (CBT) and pharmacotherapy are “gold standard” treatments for obsessive-compulsive disorder (OCD), complementary and alternative treatments are frequently sought for anxiety disorders. The purpose of this chapter is to review and discuss the available research on the application, efficacy and effectiveness of complementary and alternative methods for treating OCD. The first section identifies and reviews studies focusing on specific alternative and complementary treatments that are independent from, or work in conjunction with CBT, such as yoga, herbal remedies, motivational strategies, and bibliotherapy. The second section discusses alternative and complementary methods of more mainstream CBT and related techniques, with a particular focus on technology-supported approaches. The chapter concludes with a discussion of the methodological issues in the existing research on complementary and alternative methods in the treatment of OCD, questions for future research, and implications for providers.
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Biomedica: Desde la Perspectiva del Estudiante. Tampa, Fl: Techniciansfriend.com, 2008.
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Multimedia in Health Sciences Education. Berlin, Germany: Logos-Verlag Berlin, 2001.
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Ferguson, Robert, and Karen Gillock. Memory and Attention Adaptation Training. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780197521526.001.0001.
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Memory and Attention Adaptation Training (MAAT) is a cognitive-behavioral therapy (CBT) designed to help cancer survivors self-manage and mitigate the late and long-term effects of cancer and cancer therapy on memory function. Cancer-related cognitive impairment (CRCI) is a set of mild to moderate memory and attention impairments that can have an adverse influence on quality of life. CRCI symptoms tend to present during active treatment, but for some individuals cognitive changes can persist for years. While the exact prevalence of CRCI is unknown, review of the literature estimates that nearly half of all survivors may experience some form of CRCI. Causes of CRCI are multiple and are the subject of continued research. Chemotherapy, genetic vulnerability, neurovascular damage, inflammation, and hormonal/endocrine disruption have all been identified as candidate mechanisms of persistent cognitive change. Given the multiple causal mechanisms, finding a biomedical treatment for CRCI remains elusive. MAAT was developed as a CBT to help cancer survivors make adaptive behavioral and cognitive changes to improve performance in the valued activities that CRCI hinders. MAAT consists of eight visits and has been designed for administration through telehealth technology, improving access to the survivorship care that so many cancer survivors may lack after the time and expense of cancer treatment. Survivors can use this workbook to reinforce their in-session learning and continue to build adaptive coping.
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Safren, Steven A., Susan E. Sprich, Carol A. Perlman, and Michael W. Otto. Mastering Your Adult ADHD. Oxford University Press, 2017. http://dx.doi.org/10.1093/med:psych/9780190235581.001.0001.
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The treatment program outlined in this book is designed for use by a therapist who is familiar with cognitive-behavioral therapy (CBT). The program helps adult clients with ADHD learn skills to help them cope with their symptoms. Core modules on organizing and planning, reducing distractibility, and adaptive thinking are included, as is an optional module on reducing procrastination. An informational meeting can also be included with a spouse, partner, or family member. The guide concludes with a discussion of how to help the client handle slips and maintain the gains made in treatment. This revised version of the therapist guide incorporates many changes from the first edition, including an enhanced discussion of how to incorporate technology into the treatment and new “signposts of change” sections in each chapter.
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Ferguson, Robert, and Karen Gillock. Memory and Attention Adaptation Training. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780197521571.001.0001.
Full textAbstract:
Memory and Attention Adaptation Training (MAAT) is a cognitive-behavioral therapy (CBT) designed to help cancer survivors self-manage and mitigate the late and long-term effects of cancer and cancer therapy on memory function. Cancer-related cognitive impairment (CRCI) is a set of mild to moderate memory and attention impairments that can have an adverse influence on quality of life. CRCI symptoms tend to present during active treatment, but for some individuals cognitive changes can persist for years. While the exact prevalence of CRCI is unknown, review of the literature estimates that nearly half of all survivors may experience some form of CRCI. Causes of CRCI are multiple and are the subject of continued research. Chemotherapy, genetic vulnerability, neurovascular damage, inflammation, and hormonal/endocrine disruption have all been identified as candidate mechanisms of persistent cognitive change. Given the multiple causal mechanisms, finding a biomedical treatment for CRCI remains elusive. MAAT was developed as a CBT to help cancer survivors make adaptive behavioral and cognitive changes to improve performance in the valued activities that CRCI hinders. MAAT consists of eight visits and has been designed for administration through telehealth technology, improving access to survivorship care that so many cancer survivors may lack after the time and expense of cancer treatment. Survivors are provided a workbook they can use to work with their clinician and to reinforce learning and adaptive coping. This clinician manual guides the clinician step by step on MAAT administration and provides background on the theoretical underpinnings of CRCI and MAAT.
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Sprich, Susan, and Steven A. Safren. Overcoming ADHD in Adolescence. Oxford University Press, 2020. http://dx.doi.org/10.1093/med-psych/9780190854485.001.0001.
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This Client Workbook is an accompaniment to the Therapist Guide, Overcoming ADHD in Adolescence: A Cognitive Behavioral Approach. The treatment and manuals are designed for clients to complete with the help of a therapist who is familiar with cognitive behavioral therapy (CBT) and/or other structured therapeutic approaches. The program is designed to help adolescent clients with attention-deficit/hyperactivity disorder (ADHD) learn skills to help them cope with their ADHD symptoms. Core modules on organizing and planning, reducing distractibility, and adaptive thinking are included, as is an optional module on reducing procrastination. The emphasis is primarily on teaching the adolescent how to learn skills to combat ADHD and function independently. Information is provided regarding how to include parents in the treatment: inviting a parent or parents in at the end of sessions, including parents in goal setting in joint sessions with the adolescent, and optional coaching sessions without the adolescent present. The guide concludes with a discussion of how to help clients maintain the gains that they have made in treatment. The client workbook and therapist guide include a discussion of how to incorporate technology into the treatment and a “signposts of change” section in each chapter. The manuals include many worksheets and forms, as well as a link to an assessment measure that can be used repeatedly to gauge progress in treatment.
Book chapters on the topic "CBCT technologie"
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Johari, Rahul, Kanika Gupta, Saurabh Kumar Jha, and Vivek Kumar. "CBCT: CryptoCurrency Based Blockchain Technology." In Data Science and Analytics, 90–99. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5830-6_8.
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Grant, Gerald T., Jayanthi Parthasarathy, Shivakumar Raman, Bruno Azevedo, and William C. Scarfe. "CBCT and Additive Manufacturing Technology." In Maxillofacial Cone Beam Computed Tomography, 1207–42. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-62061-9_31.
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Luminati, Tito, and Eugenio Tagliafico. "CBCT Systems and Imaging Technology." In Cone Beam CT and 3D imaging, 1–12. Milano: Springer Milan, 2013. http://dx.doi.org/10.1007/978-88-470-5319-9_1.
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Dalle Grave, Riccardo, Massimiliano Sartirana, Marwan El Ghoch, and Simona Calugi. "CBT-OB and Digital Technology." In Treating Obesity with Personalized Cognitive Behavioral Therapy, 221–27. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91497-8_15.
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Codd, R. Trent. "TECHNOLOGY IN CBT TRAINING AND SUPERVISION." In Teaching and Supervising Cognitive Behavioral Therapy, 121–32. Hoboken, New Jersey: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119179948.ch07.
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Rathi, Shikha, and David Hatcher. "Radiographic Evaluation of the Alveolar Ridge in Implant Dentistry. CBCT Technology." In Horizontal Alveolar Ridge Augmentation in Implant Dentistry: A Surgical Manual, 55–71. Hoboken, New Jersey: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119019916.ch06.
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Gavrila, Monica, and Natalia Elita. "Comparing CBMT Approaches for German-Romanian." In Human Language Technology Challenges for Computer Science and Linguistics, 445–55. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-14120-6_36.
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Kurokawa, Takashi, Ryo Nojima, and Shiho Moriai. "Can We Securely Use CBC Mode in TLS1.0?" In Information and Communication Technology, 151–60. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24315-3_15.
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Seidel, Robert J., and Ok-Choon Park. "Evaluation of CBT Authoring Systems: Need a Data Base." In Advanced Technologies Applied to Training Design, 11–21. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-3014-5_2.
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Gregory, Dik, and Paul French. "ATR trainer: Intelligent CBT for the Rest of Us?" In Advanced Technologies Applied to Training Design, 23–35. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-3014-5_3.
Full textConference papers on the topic "CBCT technologie"
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El-Genk, Mohamed S., and Jean-Michel Tournier. "Performance Comparison of VHTR Plants With Direct and Indirect Energy Conversion Cycles." In Fourth International Topical Meeting on High Temperature Reactor Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/htr2008-58276.
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This paper compared the performance of very high temperature reactor (VHTR) plants with direct and indirect closed Brayton Cycles (CBCs) and investigated the effect of the molecular weight of the CBC working fluid on the number of stages in and the size of the single shaft turbomachines. The CBC working fluids considered are helium (4 g/mole) and He-Xe and He-N2 binary mixtures (15 g/mole). Also investigated are the effects of using LPC and HPC with inter-cooling, cooling the reactor pressure vessel with He bled off at the exit of the compressor, and changing the reactor exit temperature from 700°C to 950°C on the plant thermal efficiency, CBC pressure ratio and the number of stages in and size of the turbo-machines. Analyses are performed for reactor thermal power of 600 MW, shaft rotation speed of 3000 rpm, and IHX temperature pinch of 50 °C.
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Aguado, Marina, Oscar Onandi, Eduardo Jacob, Christian Pinedo, Purificacion Saiz, and Marivi Higuero. "WiMAX Role on CBTC Systems." In ASME/IEEE 2007 Joint Rail Conference and Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/jrc/ice2007-40103.
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The recent progresses in mobile telecommunications technologies have allowed railway telecommunications technology to go a step forward, and, in the same way, the railway control systems. In this sense, while the mobile telecommunications technology evolved from the first generation of analogue mobile communication systems to what is known today as B3G (Beyond 3G), the same occurred with the telecommunication systems used in railways, from those based on analogue telecommunications, to the most recent ones based on 2G such as GSM-R or TETRA. Till recently, there was a technological gap regarding high mobility environments, high transmission rate and high interactivity (low latency). However, new emerging telecommunications technologies have shortened this gap significantly. This way, the train control systems will be affected by the availability of telecommunications technologies capable of offering earth-train broadband communications in real time. This article presents a telecommunications network architecture based on WiMAX (Worldwide Interoperability for Microwave Access) mobile technology (IEEE 802.16e) that fulfils the telecommunications needs in the railway environment. The WiMAX mobile technology most relevant features are: transmission rates up to 30Mbps at 15 km distance; mobility support up to 200km/h; QoS, security, low latency, fast, scalable and cost effective deployment, mainly compared to GSM-R deployment. In the mobile node design of this network telecommunications architecture, the multipath fading effect, and the Doppler effect, present in high speed mobility scenarios, have been taken into account. An improvement in the handoff between BSs, through a neighbouring and predictive mobility algorithm, is included. The architecture proposed supports the functional and system requirements identified in the UIC Project EIRENE (European Integrated Railway Radio Enhanced Network), and demanded to GSM-R technology. Measures on a real testbed and a model developed with the discrete event simulation tool, Opnet, have been employed in this work.
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Diemunsch, Kenneth M., and Daniel J. Reitz. "Consequences of Failed Track Circuits on Conventional Signaling System in CBTC Projects." In 2013 Joint Rail Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/jrc2013-2515.
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In recent years, many rapid mass transit agencies have chosen Communication Based Train Control (CBTC) technology to refurbish their signaling system or to equip a new line. CBTC technology is a type of Automatic Train Control (ATC) that allows transit agencies to increase nominal throughput and to improve safety. The main functions of CBTC are described in [1.] and [2.]. This technology can operate without fixed wayside track detectors such as track circuits. However, track circuit equipment continues to be implemented on the tracks and in the equipment rooms. For authorities under the Federal Railroad Administration, current regulations require use of track circuit but the main functional reason is to have a backup system in case of CBTC failure. Most transit agencies decide to include track circuit occupied and vacant status into the CBTC system in order to enhance safety. How to enhance safety and keep train operation efficient during track circuit failure is a challenge for CBTC projects. This paper discusses the relationship between the CBTC and the conventional interlocking system when track circuit failure occurs. The analysis in this paper applies to both relay and solid state interlocking systems as both technologies have to deal with the same impact under this scenario. The method of detection of track circuit failure by the CBTC system and the possible restrictions on CBTC train operation are not presented. The paper focuses on the interface between the CBTC and the signaling system. It begins by introducing the different types of track circuit failures and their consequences on conventional signaling system to address and compare multiple scenarios. Then, the paper discusses how the CBTC system can affect the conventional signaling system equipment, such as signals and train stops, once it has detected a track circuit failure. Transit agencies’ different possible approaches to manage track circuits failures within the context of an operating CBTC system are explained.
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Chy, John. "Application of Virtualization to Implement the Automatic Train Supervision System of a Communications Based Train Control System." In 2020 Joint Rail Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/jrc2020-8085.
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Abstract Capacity improvement and obsolescence management are the primary reasons for deploying Communications Based Train Control (CBTC) technology to replace conventional track circuit-based signaling systems like in New York City Transit (NYCT), Baltimore Maryland Transit Administration (MTA) or the San Francisco Bay Area Rapid Transit District (BART). Resignaling projects without stopping revenue operations are highly complex and are referred as brownfield train control projects. The Automatic Train Supervision (ATS) subsystem in a CBTC System is responsible for monitoring and regulating train operations. The ATS’ responsibilities include functions such as identifying trains, tracking and displaying trains, setting speed restrictions and work zones, automatic and manual routing capabilities. In addition, the ATS serves as the Human Machine Interface (HMI) between Train Controllers at the Operations Control Center (OCC). One of the challenges in brownfield train control projects is fitting a CBTC ATS subsystem into an already existing Operations Control Center (OCC). The console in the operating theater will need to host both the existing system and the new CBTC ATS workstation. Similarly, the technical rooms may already be at capacity but still need to accommodate the CBTC system in addition to the legacy system for the transition period. Transferring the OCC to a new building is often part of the modernization program and is the ideal method to mitigate space constraints. However, CBTC deployment is not always associated with transfer to a new larger building with a large OCC theater. Transfer to the new OCC with more space may be done before the CBTC deployment or at the same time as the CBTC revenue service. When there is no new larger OCC, solutions need to be investigated to accommodate both the legacy system and the new CBTC at the existing OCC. Advancements in virtual technology provides a more efficient solution that reduces the amount of physical space an ATS needs in the OCC without compromising communication and processing speed or capabilities. This paper describes the different equipment and functionalities of an ATS subsystem and the challenge of fitting each piece into an existing OCC while keeping the legacy system. The paper then discusses the basic technology behind networking, defining the concept of machine virtualization at a high level, and how all these technologies may be used to solve the ATS challenges faced during CBTC resignaling projects.
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Wicaksono, Aryo, Agung Harsoyo, and Ary Setijadi Prihatmanto. "Three dimensions medical CBCT reconstruction and visualisation analysis." In 2012 International Conference on System Engineering and Technology (ICSET). IEEE, 2012. http://dx.doi.org/10.1109/icsengt.2012.6339338.
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Diemunsch, Kenneth, and Nagaratnam Rabindran. "Origins and Current Status of the Different Communications-Based Train Control Products." In 2020 Joint Rail Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/jrc2020-8020.
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Abstract Communications-Based Train Control (CBTC) technology is used by transit agencies in large cities to maximize the use of their infrastructure. In comparison with conventional block signal system and cab signaling system, CBTC provides the most efficient capabilities with respect to headway and throughput while being the most economical in terms of maintenance cost [1]. CBTC also provides better diagnostic capabilities compared to traditional signaling systems. It uses limited number of equipment on the trackside compared to traditional signaling systems and allows either a centralized architecture or distributed architecture. For these reasons, CBTC is now the favored system for new lines as well as most signaling system renewals.[1] Despite widely used CBTC standards, the signaling industry is not in agreement regarding what qualifies as a CBTC system and which projects are the first “real” CBTC projects. This work describes the different CBTC vendors, their genesis, when access point based radio was first introduced (access point based radio is also referred by signaling engineers as free space propagation radio), the different consolidations with other CBTC companies, and their major projects. From the authors’ viewpoint, it is appropriate to present the CBTC vendors by geographical areas, for instance in North America: Bombardier Transportation, Thales Rail Signaling Solutions, in Europe: Alstom Transport, Hitachi Rail, Siemens Mobility, in Asia: Beijing Traffic Control Technology, China Railway Signal and Communications, Mitsubishi Electric Corporation, and Nippon Signals.
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Keevill, Dave. "Communication Based Train Control Technology Selection." In 2014 Joint Rail Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/jrc2014-3705.
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You have selected Communications-Based Train Control (CBTC) for your new transit line, or as an upgrade to the signaling system on your existing rail network. You look forward with anticipation to the benefits it will bring your agency in terms of capacity, safety and reliability. You plan to release your Request for Proposals to the street and then sit back and watch a pack of ravenous CBTC system suppliers pounce on it, eager to make all your signaling dreams come true. But how do you ensure consistency among the offers, to enable you to select the right system for your operation? How do you specify a system that can reasonably be delivered within your budget and schedule constraints? Should you evaluate based on capital or life cycle cost? What bid evaluation criteria should you employ? There are so many factors to consider: tried and true technology vs. cutting edge; an off-the-shelf solution vs. one customized to the exacting specifications of your Operations and Maintenance departments; the degree to which redundancy should be built into the system; readiness to integrate with other support systems, like the data communications backbone or SCADA. Is one CBTC system architecture a better fit for your property, or is it “six of one, half a dozen of the other”? This paper will address the technical components of these factors, to assist you in selecting the right technology for your CBTC deployment.
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Pavaloiu, Ionel-Bujorel, Nicolae Goga, Andrei Vasilateanu, and Iuliana Marin. "3D RECONSTRUCTION FROM CBCT DATA USED IN DENTISTRY LEARNING." In International Technology, Education and Development Conference. IATED, 2016. http://dx.doi.org/10.21125/iceri.2016.2196.
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Hofbauer, John. "Challenges With Applying Axle Counter Technology in the USA." In 2017 Joint Rail Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/jrc2017-2293.
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There is a growing trend for transit agencies to evolve from wayside and cab-based signal systems to Communication Based Train Control (CBTC). With the complexity of CBTC, a failure of CBTC component could bring a transit system to a standstill. Implementing a secondary signal system can serve to minimize the consequences of a CBTC failure. It is paramount for a transit system to continue to operate, and axle counter technology can be a suitable candidate for use as a secondary signal system. Axle Counter technology has not been widely used in the U.S., but has been used for many years in Europe and the rest of the world. This paper will review and analysis the following: 1. Train Detection Systems; Track circuits vs. axle counters and the basic Principles of Axle Counting; check-in and check-out. 2. Implementing Electromagnetic Compatibility and the EMI standards used in European with previous testing of various axle counter systems, and the frequencies that have been selected, and the proper usage of these frequencies. 3. Testing of radiated emissions using existing guidelines and methods to analyze existing wayside and vehicle Electromagnetic Interferences (EMI), environment conditions, and the limitations of installing axle counters in an existing rail or transit system. 4. Recommendations for improving vehicle and wayside specifications and standards within the U.S. for dealing with installation of axle counter equipment and with failures and EMI emissions between railway devices.
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Yichen, Xie, Chen Jian, Yan Bin, Zeng Lei, Tong Li, and Zeng Yin. "A seam-line removal method on mosaicing of CBCT images." In 2012 2nd International Conference on Computer Science and Network Technology (ICCSNT). IEEE, 2012. http://dx.doi.org/10.1109/iccsnt.2012.6525887.
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