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Literatura académica sobre el tema "Chest scanner"

Autor: Grafiati

Publicado: 10 de marzo de 2023

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Artículos de revistas sobre el tema "Chest scanner"

Thakur, Yogesh, Thorarin A. Bjarnason, Patricia Baxter, Mitch Griffith y Kirk Eaton. "Radiation Dose Survey for Common Computed Tomography Exams: 2013 British Columbia Results". Canadian Association of Radiologists Journal 67, n.º 1 (febrero de 2016): 88–95. http://dx.doi.org/10.1016/j.carj.2015.07.002.

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In 2013 Health Canada conducted a national survey of computed tomography (CT) radiation usage. We analysed contributions from all 7 public health authorities in the province of British Columbia, which covered scanner age, number of slices, and common adult protocols (≥19 years: 70 ± 20 kg, head, chest, abdomen/pelvis, and trunk). Patient doses were recorded for common protocols. Diagnostic reference levels (DRLs) was calculated using scanner data with >10 patient doses recorded for each protocol. Data was analysed based on image reconstruction (filtered backprojection vs iterative reconstruction [IR] vs IR available but not in use). Provincial response was 92%, with 59 of 64 CT data used for analysis. The average scanner age was 5.5 years old, with 39% of scanners installed between 2008-2013; 78.5% of scanners were multislice (>64 slices), and 44% of scanners had IR available. Overall British Columbia DRLs were: head = 1305, chest = 529, abdomen/pelvis = 819, and trunk = 1225. DRLs were consistent with Health Canada recommendations and other Canadian published values, but above international standards. For sites with IR available, less than 50% used this technology routinely for head, chest and trunk exams. Overall, use of IR reduced radiation usage between 11%-32% compared to filtered backprojection, while sites using IR vs IR available used 30%/43% less radiation for head/chest exams ( P < .05). No significant difference was observed for abdomen/pelvis exams ( P = .385). With the fast pace of CT technical advancement, DRLs should reflect the technology used, instead of just globally applied to anatomical regions. Federal guidelines should be updated at a higher frequency to reflect new technology. In addition, new technologies must be utilised to optimize image quality vs radiation usage.

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Minami, Masahide, KojiAbe y Munehiro Nakamura. "Discrimination of Pneumoconiosis X-Ray Images Scanned with a CCD Scanner". Journal of Advanced Computational Intelligence and Intelligent Informatics 16, n.º 1 (20 de enero de 2012): 69–75. http://dx.doi.org/10.20965/jaciii.2012.p0069.

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This paper presents a discrimination of pneumoconiosis X-ray images obtained with a common CCD scanner. Since the current computer-aided diagnosis systems of pneumoconiosis are not practical due to high costs of usage, features for measuring abnormalities of pneumoconiosis are proposed as variables for the discrimination in this paper. In the images, abnormal levels of pneumoconiosis could depend on density distribution in each of intercostal and rib areas. Therefore, the proposed method measures the abnormalities by extracting characteristics of the distribution in the areas. Besides, using the abnormalities, the proposed method discriminates chest X-ray images into normal or abnormal cases of pneumoconiosis. Experimental results of the discriminations for 56 right-lung images have shown that the proposed abnormalities are well extracted for the discrimination.

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Olszynski, P., R. Woods, S. Netherton, Q. Hussain, B. Blondeau y S. Dunn. "P066: Ultrasound localization to resuscitate in arrest (ULTRA)". CJEM 21, S1 (mayo de 2019): S87. http://dx.doi.org/10.1017/cem.2019.257.

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Introduction: There is increasing evidence supporting ultrasonography for the determination of optimal chest compression location during cardiac arrest. Radiological studies have demonstrated that in up to 1/3 of patients the aortic root or outflow tract is being compressed during standard CPR. Out-of-hospital-cardiac-arrests (OHCA) could benefit from cardiac localization, undertaken with scaled-down ultrasound equipment by which the largest fluid filled structure in the chest (the heart) is identified to guide optimal compression location. We intend to evaluate 1) where the left ventricle is in supine patients, 2) the accuracy and precision as well as 3) the feasibility and reliability of cardiac localization with a scaled down ultrasound device (bladder scanners). Methods: We are recruiting men and women over the age of 40. The scanning protocol involves using a bladder scanner on a 15-point grid over the subject's left chest and parasternal, midclavicular, and anterior axillary intercostal spaces 3-7. Detected volumes will be recorded, with the presumption that the intercostal space with the largest measured volume is centered over the heart. Echocardiography will then be used to confirm the bladder scanner accuracy and to better describe the patient's internal chest anatomy. Having assessed procedural feasibility on 3 pilot subjects, we are now recruiting 100 participants, with planned interim analysis at 50 participants for sample size reassessment. Maximal volume location frequencies from the echocardiograms will be described and assessed for variation utilizing the goodness-of-fit test. The proportion of agreement across the two modalities regarding the maximal volume location will also be examined. Results: Among the 3 volunteers (pilot study), the scanner identified fluid in 4-8 of 15 intercostal spaces. In each of the three pilot study patients, the maximal volume identified by the bladder scanner was found to be at the parasternal location of the 6th intercostal space. This was also the location of the mid left ventricular diameter on echocardiography. Conclusion: Our literature review and pilot study data support the premise that lay persons and emergency medical personnel may improve compressions (and thus outcomes) during OHCA by using a scaled-down ultrasound to identify the location of optimal compression. We are currently enrolling patients in our study.

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Ahdi Rezaeieh, Sasan, Ali Zamani, Konstanty Bialkowski, Graeme Macdonald y Amin Abbosh. "Three-Dimensional Electromagnetic Torso Scanner". Sensors 19, n.º 5 (27 de febrero de 2019): 1015. http://dx.doi.org/10.3390/s19051015.

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A three-dimensional (3D) electromagnetic torso scanner system is presented. This system aims at providing a complimentary/auxiliary imaging modality to supplement conventional imaging devices, e.g., ultrasound, computerized tomography (CT) and magnetic resonance imaging (MRI), for pathologies in the chest and upper abdomen such as pulmonary abscess, fatty liver disease and renal cancer. The system is comprised of an array of 14 resonance-based reflector (RBR) antennas that operate from 0.83 to 1.9 GHz and are located on a movable flange. The system is able to scan different regions of the chest and upper abdomen by mechanically moving the antenna array to different positions along the long axis of the thorax with an accuracy of about 1 mm at each step. To verify the capability of the system, a three-dimensional imaging algorithm is proposed. This algorithm utilizes a fast frequency-based microwave imaging method in conjunction with a slice interpolation technique to generate three-dimensional images. To validate the system, pulmonary abscess was simulated within an artificial torso phantom. This was achieved by injecting an arbitrary amount of fluid (e.g., 30 mL of water), into the lungs regions of the torso phantom. The system could reliably and reproducibly determine the location and volume of the embedded target.

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Gleadall-Siddall, Damien Oliver, Richard Lincoln Turpin, Caroline Clare Douglas, Lee Ingle y Andrew Thomas Garrett. "Test–retest repeatability of the NX-16: a three-dimensional (3D) body scanner in a male cohort". Sport Sciences for Health 16, n.º 2 (13 de diciembre de 2019): 337–46. http://dx.doi.org/10.1007/s11332-019-00611-8.

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Abstract Purpose Whole-body three-dimensional scanning is a tool utilised for the collection of body girths, volume, and surface area measurements. Few studies have investigated the validity and repeatability of this technology. The aim of the present study was to investigate the test retest variability of the NX-16 body scanner (NX-16, TC2, Cary, North Carolina, USA). Methods Phase one involved the measurement of a mannequin on 300 occasions (30 scans over 10 sessions). In phase two, 13 apparently healthy male participants were recruited; each participant was scanned a total of four times (two scans over two sessions). Stature, body mass, and body fat % were obtained. Fourteen girth measurements were obtained (chest, underbust, stomach, waist, seat, hip, R/L bicep, R/L thigh, R/L mid-thigh, and R/L calf). Coefficient of variation was calculated for measurements obtained. Results Coefficient of variation for phase one ranged from 0.0% for the R calf, to 3.3% for the L thigh measurement. For phase two, values were higher, ranging from 0.5% for calf and chest to 4.6% for thigh measurements. Conclusions Test–retest variability of the measurements provided by the NX-16 body scanner varied according to body location. However, variability within measurements was low using a mannequin or human participant. The NX-16 body scanner (TC2, Cary, North Carolina, USA) may be a useful tool for tracking changes in body composition over time during large population studies.

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Sveljo, O. B., Z. Markovic, B. Reljin, R. Semnic, Lucic Adjic, T. L. Stosic-Opincal y M. Prvulovic. "Dijagnosticki kvalitet slike CT pregleda grudnog kosa". Acta chirurgica Iugoslavica 54, n.º 3 (2007): 99–103. http://dx.doi.org/10.2298/aci0703099s.

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The paper is aimed at determining diagnostic quality of the images in different chest CT examination protocols. Two groups of patients underwent scanning based on two different protocols using Siemens Somatom 4 Plus scanner in the spiral mode. The study included the total of 64 patients divided in two groups according to their body weight (BW). Group one included 34 patients weighing above 80 kg and they were scanned according to the standard protocol. Group two comprised 30 patients weighting below 80 kg and they were scanned using the same protocol however with reduction of tube current of 13 mA. All the scans were subsequently reconstructed using noise-reduction filter (enhancement of low contrast resolution).

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Druzhinina, P. S., L. A. Chipiga, I. G. Shatskiy, A. V. Vodovatov, A. V. Pozdnyakov, V. G. Puzyrev, A. I. Tashchilkin, D. A. Malikov, N. N. Potrakhov y Yu N. Potrakhov. "Optimization of CT Protocols for Newborn Patients by Ingenuity 128, Philips. A Phantom Study". Meditsinskaya Fizika 96, n.º 4 (30 de enero de 2023): 43–55. http://dx.doi.org/10.52775/1810-200x-2022-96-4-43-55.

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Purpose: To evaluate the impact of CT scan protocol parameters on patient dose and image quality for optimization of protocols for newborn patients. Materials and methods: Three anatomical areas (chest, abdomen and combined chest + abdomen area) of a newborn PH-50 Newborn Whole-Body Phantom (Kyoto Kagaku Co, LTD, Japan) were scanned on Ingenuity 128 CT scanner (Philips) using different scan parameters. The values of weighted CT dose index (CTDIvol) and dose length product (DLP) were used as dose characteristics and the noise of CT image was chosen to estimate the image quality. The noise was determined in the soft tissues in the areas of shoulder girdle and diaphragm in images with the reconstruction kernel B, as well as in lung tissue of lung apices for images with the reconstruction kernel YC for chest and chest + abdomen; and in soft tissues (for reconstruction kernel B) in the area of the diaphragm for abdomen. Results: The analysis of the impact of tube voltage and dose right index (DRI) on dose characteristics and image quality made it possible to determine the optimal parameters of CT protocols for selected CT department: chest – 80 kV at DRI -– 19, abdomen – 100 kV at DRI – 22, chest + abdomen – 120 kV at DRI – 22. These protocol parameters provide an effective dose of newborn patients – 1.4, 1.7 and 2,8 mSv for chest, abdomen and chest + abdomen scans, respectively. Conclusion: The impact of different scan parameters (tube voltage and DRI) of chest, abdomen and chest + abdomen protocols on patient dose and image noise was evaluated. The study allowed setting optimized protocol parameters to improve the image quality.

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Milosevic, Paula y Slavica Bogovic. "3D technologies in individualized chest protector modelling". Textile & Leather Review 1, n.º 2 (septiembre de 2018): 46–55. http://dx.doi.org/10.31881/tlr.2018.vol1.iss2.p46-55.a6.

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The application of 3D technology increases every day by discovering new ways of usage, which can make everyday life easier. It is most used in production of individualized items that become more accessible and fully customized to personal needs. 3D technologies such as 3D scanning, 3D modelling and additive technologies (3D printing) are used in various areas of human activity such as medicine, architecture, the movie industry, etc. In the clothing’s industry, 3D scanning the human body is digitized, which is after that used in computer software packages for custom-made clothing. Except for the fashion industry, there is a need for individualized protective work clothing and equipment production in other industries as well. The possibility of applying new technologies such as 3D scanning and 3D modelling of protective elements that can be made by using 3D printers is presented in this paper. In order to design a field hockey chest protector, male and female subjects were scanned using a 3D body scanner in several different positions specific to the sport. The chest protector was constructed and modeled based on the digitalized images. Software packages were used which enable point clouds preparation of the digitalized human body for constructing the protector, its modelling and preparation of virtually designed protectors for 3D printing. An individualized chest protector is modeled using a software program called Bender. The protector is integrated into the clothing item, completely follows the body shape and provides the necessary protection.

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Abdi, Ahmed Jibril, Bo Mussmann, Alistair Mackenzie, Benedikte Klaerke y Poul Erik Andersen. "COMPARISON OF RADIATION EXPOSURE TO THE PATIENT AND CONTRAST DETAIL RESOLUTIONS ACROSS LOW DOSE 2D/3D SLOT SCANNER AND TWO CONVENTIONAL DIGITAL RADIOGRAPHY X-RAY IMAGING SYSTEMS". Radiation Protection Dosimetry 185, n.º 2 (27 de febrero de 2019): 252–65. http://dx.doi.org/10.1093/rpd/ncz006.

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Abstract Purpose To assess and compare the radiation dose and image quality of the low dose 2D/3D EOS slot scanner (LDSS) to conventional digital radiography (DR) X-ray imaging systems for chest and knee examination protocols. Methods and materials The effective doses (ED) to the patient in the chest and knee clinical examination protocols for LDSS and DR X-ray imaging systems were determined using the dose area product and PCXMC Monte Carlo simulation software. The CDRAD phantom was imaged with 19 cm, and 13 cm thick Polymethyl Methacrylate (PMMA) blocks to simulate the chest and knees respectively of a patient of average adult size. The contrast detail resolution was calculated using image analysis software. Results The EDs for the LDSS default setting were up to 69% and 51% lower than for the DR systems for the chest (speed 4) and knee (speed 6) protocols, respectively, while for the increased dose level setting then the EDs were up to 42% and 35% lower than for the DR systems for the chest (speed 6) and knee (speed 8) protocols respectively. At the default setting, the contrast detail was lowest for the default setting of the 2D/3D low dose slot scanner (LDSS) for both chest and knee examinations, but at the highest dose levels then the threshold were equal or higher than the contrast resolution of DR imaging systems. Conclusion The LDSS has the potential to be used for clinical diagnosis of chest and knee examinations using the higher dose level. For speed 6 in chest protocol and speed 8 in knee protocol, the measured contrast detail resolution was comparable with the DR systems but at a lower effective dose.

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Baston, Cameron y Sharad Patel. "A CT Scanner in Your Pocket? Lung Ultrasonography Beats Chest Radiography*". Critical Care Medicine 48, n.º 2 (febrero de 2020): 255–57. http://dx.doi.org/10.1097/ccm.0000000000004149.

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Más fuentes

Tesis sobre el tema "Chest scanner"

Paul, Jijo [Verfasser], Werner [Akademischer Betreuer] Mäntele y Thomas J. [Akademischer Betreuer] Vogl. "Image quality and dosimetry of a dual source computed tomography scanner with special emphasis on radiation dose of lung in a chest examination / Jijo Paul. Gutachter: Werner Mäntele ; Thomas J. Vogl". Frankfurt am Main : Univ.-Bibliothek Frankfurt am Main, 2011. http://d-nb.info/1044195088/34.

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Servi, Michaela. "RE&AM-based methods and tools for biomedical engineering". Doctoral thesis, 2020. http://hdl.handle.net/2158/1188798.

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In line with recent approaches to personalized medicine, where 3D technologies are rapidly becoming a new concept of treatment based on the ability to model patient-specific devices, this work aims to analyze the life cycle of a customized device in order to achieve a related systematic production, in the effort to provide tools that can be introduced into clinical practice and used directly by hospital staff. In this context, tools for arm acquisition and modeling of custom orthoses have been developed, as well as tools for monitoring and treatment of thoracic malformations.

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Capítulos de libros sobre el tema "Chest scanner"

Katashev, A., K. Romberg, A. Danielsson y H. Saraste. "Application of 3D Scanner for Estimation of Chest Movement in Scoliotic Patients". En IFMBE Proceedings, 63–66. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-12967-9_17.

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Nieman, Koen. "Coronary computed tomography angiography: detection of coronary artery stenosis". En ESC CardioMed, editado por Stephan Achenbach, 546–51. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0114.

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Coronary computed tomography (CT) angiography provides non-invasive visualization of the coronary arteries. Contemporary scanners allow for reliable rule-out of coronary artery obstruction in patients with a low to intermediate probability of disease. For the triage of low-risk patients with acute chest pain, cardiac CT is safe and has logistic benefits by allowing early discharge from the emergency department. In patients with stable anginal symptoms, cardiac CT in addition to, or instead of, functional testing improves the diagnostic certainty and is associated with an equivalent or even improved clinical outcome. Functional severity of coronary artery disease may be assessed by myocardial perfusion imaging or computer-based simulations to calculate the fractional flow reserve from CT angiography images. Metal stents cause artefacts that limit interpretation of the lumen in small coronary arteries. Bypass grafts can be imaged well, but interpretation of the remaining coronary branches is often challenging after bypass graft surgery.

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McKillop, Heather. "Empowering Undergrads in 3D Digital Imaging". En Digital Heritage and Archaeology in Practice, 298–324. University Press of Florida, 2022. http://dx.doi.org/10.5744/florida/9780813069319.003.0014.

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The chapter describes a university course taught for undergraduates to learn 3D digital imaging in the DIVA Lab. The NextEngine 3D scanner is used for a series of labs on different archaeological materials, including pottery, chert, bone, and wood. Students scan artifacts and learn about them in readings. The article describes how to use the NextEngine to scan, trim, fuse, and save files in various formats, including stl, wrl, obj that are used in other softwares and for 3D printing. Emphasis is on research quality 3D scans, but scans for teaching and display purposes with less precision are discussed. Learning how to prepare 3D scans for 3D printing is incorporated in each lesson. Students observe 3D printing in the DIVA lab and sometimes 3D printing is incorporated into the course, depending on 3D printing supplies. The open source software Meshlab is used for measuring, decimating, and manipulating 3D scans. Students post 3D scans to Sketchfab and share them on wix web sites that they each create. Students post blog updates on their individual projects in which they 3D image ancient Maya ocarinas. Applications of 3D imaging in the Maya area are discussed, including 3D printed replicas of artifacts in exhibits.

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Actas de conferencias sobre el tema "Chest scanner"

Nakamura, Munehiro, Koji Abe y Masahide Minami. "Quantitative evaluation of pneumoconiosis in chest radiographs obtained with a CCD scanner". En 2009 Second International Conference on the Applications of Digital Information and Web Technologies (ICADIWT). IEEE, 2009. http://dx.doi.org/10.1109/icadiwt.2009.5273899.

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Moros, Eduardo G., William L. Straube y Robert J. Myerson. "Temperature Feedback Control for Hyperthermia of Chest Wall Volumes With Dual-Frequency Ultrasound". En ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0592.

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Abstract Therapeutic temperature distributions during hyperthermia treatments are very difficult to maintain (e.g., 41.5 to 43°C for 45 to 60 min.) due to many heat removal/loss mechanisms. Thermoregulatory responses of the human body are efficacious in preserving and re-establishing normothermic conditions, and are considered to be the main cause of temperature non-uniformities through effected changes in blood perfusion and blood flow in large vessels. From the very beginning of hyperthermia technology development temperature feedback control systems (temperature controllers) have been proposed as a way to counterbalance thermoregulation and improve thermal doses. Only a few controllers, however, have been thoroughly tested numerically, experimentally, and most importantly, clinically. In this paper the proportional-integral-derivative bang-bang (PIDBB) controller of Lin et al. (1990), originally designed for a scanned focused ultrasound system for deep localized hyperthermia, was applied numerically to a scanned dual-frequency planar ultrasound system for chest wall hyperthermia. It was found that PIDBB controller with the optimal parameter values as determined by Lin et al. (1990) performed satisfactorily in controlling temperatures in superficial chest wall volumes.

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Kidane, Nahom, Yuzhong Shen y Robert E. Kelly. "Evaluating Azure Kinect and Structure Mark-II 3D Surface Scanners for Clinical Chest Wall Deformity Assessment". En 2021 Annual Modeling and Simulation Conference (ANNSIM). IEEE, 2021. http://dx.doi.org/10.23919/annsim52504.2021.9552061.

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Smith, Emily J., Catherine Stauffer, Natalie Ramsy, Nina Chen, Benjamin Salzberg, Sander Sudrzynski y Holly Golecki. "Enhancing Your Everyday Sight: An Ultrasonic Visual Aid". En 2022 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/dmd2022-1017.

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Abstract To help the growing visually impaired population navigate their surroundings, we propose a low-cost device for the detection of obstacles using ultrasound technology. Existing “smart-canes” are largely add-on devices used in conjunction with the white cane and are significantly more costly than the traditional white cane. Our device, Enhancing Your Everyday Sight (EYES), is a handheld visual assistive tool that allows users with visual impairment to scan their surroundings at different levels in order to sense physical barriers, including ground elevation changes. EYES offers a similar experience as using a white cane by giving real-time haptic feedback in the form of vibrations within the handle. Distinct vibration patterns from within the handle inform the user of both the distance and height of obstacles. Using ultrasonic sensors to provide scanned input allows users to detect obstacles at ground level and chest level, distinguishing our device from the traditional white cane. Following market and user research and iterative prototype testing, we assembled our initial prototype with off-the-shelf electronics components and 3D-printed housing, thus demonstrating the feasibility of a market-ready product at a more affordable cost compared to existing solutions. After further development, this device may serve as an important tool in enabling more confidence, greater independence, and less stigma to the visually impaired community.

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