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Статті в журналах з теми "Optical CT scanner"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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1

Ogilvy, A., S. Collins, W. Hare, M. Hilts, T. Tuokko, R. Deardon, and A. Jirasek. "Simulated design optimization of a prototype solid tank optical CT scanner for 3D radiation dosimetry." Journal of Physics: Conference Series 2167, no. 1 (January 1, 2022): 012009. http://dx.doi.org/10.1088/1742-6596/2167/1/012009.

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Abstract Optical computed tomography (CT) is one of the leading modalities for imaging gel dosimeters. There exist many prototype designs, as well as some commercial optical CT scanners that have showcased the value that gel dosimeters can provide to improve 3D dose verification for radiation treatments. However, due to factors including image accuracy, scan time, or demanding setup and maintenance there is currently no single scanner that has become a ubiquitous staple in a clinical setting. In this work, a prototype solid tank optical CT scanner is proposed that minimizes the need for a refractive index bath commonly found in optical CT systems. In addition to the design proposal, a ray-path simulator was created to optimize the design such that the solid tank geometry improves light collection across the detector array, maximizes the volume of the dosimeter scanned, and maximizes the dynamic range of the scanner.

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2

Mendricky, Radomir, and Jiri Sobotka. "Accuracy Comparison of the Optical 3D Scanner and CT Scanner." Manufacturing Technology 20, no. 6 (December 23, 2020): 791–801. http://dx.doi.org/10.21062/mft.2020.120.

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3

Campbell, W. G., A. Jirasek, and D. Wells. "Recent developments with a prototype fan-beam optical CT scanner." Journal of Physics: Conference Series 444 (June 26, 2013): 012066. http://dx.doi.org/10.1088/1742-6596/444/1/012066.

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4

Jordan, Kevin. "Scanning water phantom to optical laser CT scanner conversion kit." Journal of Physics: Conference Series 3 (January 1, 2004): 265–67. http://dx.doi.org/10.1088/1742-6596/3/1/043.

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5

Campbell, Warren G., D. A. Rudko, Nicolas A. Braam, Derek M. Wells, and Andrew Jirasek. "A prototype fan-beam optical CT scanner for 3D dosimetry." Medical Physics 40, no. 6Part1 (May 29, 2013): 061712. http://dx.doi.org/10.1118/1.4805111.

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6

Newton, J., A. Thomas, G. Ibbott, and M. Oldham. "Preliminary commissioning investigations with the DMOS-RPC optical-CT Scanner." Journal of Physics: Conference Series 250 (November 1, 2010): 012078. http://dx.doi.org/10.1088/1742-6596/250/1/012078.

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7

Sun, Li, Ya Juan Guo, Xiao Ju Liu, Hong Bo Li, Lin Liu, and Yu Xuan Gao. "The Accuracy of Tooth Image Reconstruction from Spiral CT, Micro-CT, and Cone-Beam CT Scans." Advanced Materials Research 791-793 (September 2013): 2053–57. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.2053.

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Objectives The aim of this study was to compare 3D accuracy of tooth image reconstruction from three kinds of CT scans using 3D superimpositional method. Methods 18 sound extracted human teeth were scanned by 3D optical system, spiral CT, micro-CT, and cone-beam CT scanner. The digital teeth images reconstructed from three kinds of CT scans were superimposed onto the standard image from optical scans respectively. Distribution patterns of shape discrepancy were presented using histogram, as well as showed in different colors on the superimposed imagines. The ratio of voluminal discrepancy versus the volume of the standard image (RVD/VS) was calculated and analyzed, using the matched-pair t-test and rank sum test. Results Compared with the standard tooth image, the average RVD/VS of digital teeth images by the micro-CT, cone-beam CT, spiral CT scans were 5.11%, 20.73%, 24.60% respectively, and there were statistically significant difference among the three kinds of CT scans (P<0.01). Significant difference were also found among the anterior teeth, bicuspids, and molars (P<0.01). Histogram gave the description about the counts and magnitude of the discrepancies. Marked by difference colors, the superimposed images could give visualized information about the magnitude and distribution patterns of discrepancies. Conclusions The digital teeth models reconstructed from the spiral CT, micro-CT, cone-beam CT images are inhomogeneous enlarged, compared with the original models. As the only realizable way to individualized FEM analysis, tooth modeling by CT scans needs more efforts and refinements to improve its accuracy.

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8

Lee, Jae Choon, Ae Ran Kim, Young Hoon Ji, and Soo-Il Kwon. "Characteristics of CCD Based Optical CT Scanner for Therapeutic Radiation Dosimetry." Progress in Medical Physics 27, no. 2 (2016): 72. http://dx.doi.org/10.14316/pmp.2016.27.2.72.

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9

Vandecasteele, Jan, and Yves De Deene. "Optimization of a fast optical CT scanner for nPAG gel dosimetry." Journal of Physics: Conference Series 164 (May 1, 2009): 012024. http://dx.doi.org/10.1088/1742-6596/164/1/012024.

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10

Jirasek, A., D. Rudko, and D. Wells. "A prototype fan-beam optical CT scanner for polymer gel dosimetry." Journal of Physics: Conference Series 164 (May 1, 2009): 012025. http://dx.doi.org/10.1088/1742-6596/164/1/012025.

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11

De Deene, Yves. "Feasibility study of a dry optical CT scanner using aspherical lenses." Journal of Physics: Conference Series 1305 (August 2019): 012018. http://dx.doi.org/10.1088/1742-6596/1305/1/012018.

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12

Collins, Cielle, Suk Whan Yoon, Jacob Kodra, John Adamovics, and Mark Oldham. "Preliminary characterization of the Duke Integrated-Lens Optical-CT scanner (DIOS)." Journal of Physics: Conference Series 1305 (August 2019): 012019. http://dx.doi.org/10.1088/1742-6596/1305/1/012019.

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13

Conklin, J., R. Deshpande, J. Battista, and K. Jordan. "Fast laser optical CT scanner with rotating mirror and Fresnel lenses." Journal of Physics: Conference Series 56 (December 1, 2006): 211–13. http://dx.doi.org/10.1088/1742-6596/56/1/030.

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14

Jordan, Kevin. "Radiochromic film thickness correction with convergent cone- beam optical CT scanner." Journal of Physics: Conference Series 573 (January 12, 2015): 012059. http://dx.doi.org/10.1088/1742-6596/573/1/012059.

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15

Campbell, W. G., A. Jirasek, and D. Wells. "Preliminary investigations with a photodiode-based fan-beam optical CT scanner." Journal of Physics: Conference Series 250 (November 1, 2010): 012024. http://dx.doi.org/10.1088/1742-6596/250/1/012024.

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16

Chang, Yuan Jen, Hung Li Tseng, Chin Hsing Chen, Sun Yen Tan, Bor Tsung Hsieh, Wei Lun Chang, and Wen Tzeng Huang. "Development of a CCD-Based Optical Computed Tomography Scanner Used in 3D Gel Dosimetry." Applied Mechanics and Materials 300-301 (February 2013): 1632–35. http://dx.doi.org/10.4028/www.scientific.net/amm.300-301.1632.

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Анотація:

This study proposed a CCD-based (charge-coupled device) optical computed tomography scanner (CT-s2) for 3D gel dosimetry. A parallel laser light was generated to pass through the gel sample using a diffuser and collimating lens. A CCD was used to capture projection image of gel sample at each step. An image reconstruction algorithm, filtered-back projection (FBP) technique was used to reconstruct the 3D image. Two better rotational steps are suggested as 1.0 degree and 1.5 degree for considering both of angular resolution and position deviation. The un-irradiated and irradiated BANG gel samples were scanned and reconstructed using FBP technique. Some artifacts were found in reconstructed images. Some discussions for artifacts were conducted and some solutions provided by previous researches to reduce these artifacts will be evaluated in the future work.

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17

Ramm, D. "Laser beam optical CT scanner for in-air gel readout: imaging artefacts." Journal of Physics: Conference Series 444 (June 26, 2013): 012078. http://dx.doi.org/10.1088/1742-6596/444/1/012078.

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18

Xu, Y., C. Wuu, and M. Maryanski. "SU-GG-T-290: A Fast Optical CT Scanner for Gel Dosimetry." Medical Physics 35, no. 6Part13 (June 2008): 2791–92. http://dx.doi.org/10.1118/1.2962042.

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19

Carpentier, E. E., K. M. Alexander, and L. J. Schreiner. "Quantifying refractive index mismatch effects on cone beam optical CT scanner measurements." Journal of Physics: Conference Series 847 (May 2017): 012007. http://dx.doi.org/10.1088/1742-6596/847/1/012007.

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20

Qian, Xin, John Adamovics, and Cheng-Shie Wuu. "Performance of an improved first generation optical CT scanner for 3D dosimetry." Physics in Medicine and Biology 58, no. 24 (November 22, 2013): N321—N331. http://dx.doi.org/10.1088/0031-9155/58/24/n321.

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21

Chang, Y. J. "Development of CCD-based optical computed tomography and comparison with single-beam optical CT scanner." Journal of Physics: Conference Series 573 (January 12, 2015): 012060. http://dx.doi.org/10.1088/1742-6596/573/1/012060.

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22

Brindha, S., Vinoth Kumar, S. Vasanth, and B. Ravindran Paul. "Adaptation of radiation field analyser (RFA) as optical CT scanner for gel dosimetry." Journal of Medical Physics 31, no. 1 (2006): 22. http://dx.doi.org/10.4103/0971-6203.25666.

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23

Miller, J., J. Adamovics, and J. Dietrich. "WE-D-T-617-08: Cone Beam Optical CT Scanner for 3D Dosimetry." Medical Physics 32, no. 6Part19 (May 26, 2005): 2138. http://dx.doi.org/10.1118/1.1998568.

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24

Guo, P., and M. Oldham. "SU-FF-T-230: Evaluation of the Performance of An Optical CT Scanner." Medical Physics 33, no. 6Part10 (June 2006): 2101. http://dx.doi.org/10.1118/1.2241153.

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25

Qian, X., J. Admovics, and C. Wuu. "SU-E-T-68: Improvement of Optical CT Scanner for 3-D Dosimetry." Medical Physics 40, no. 6Part11 (June 2013): 219. http://dx.doi.org/10.1118/1.4814503.

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26

Yao, C. H., W. T. Hsu, S. M. Hsu, P. Y. L. Ma, B. T. Hsieh, and Y. J. Chang. "NIPAM polymer gel dosimetry for IMRT four-field box irradiation using optical-CT scanner." Journal of Physics: Conference Series 444 (June 26, 2013): 012030. http://dx.doi.org/10.1088/1742-6596/444/1/012030.

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27

Ramm, D., and T. P. Rutten. "Feasibility of a dual wavelength laser optical CT scanner with in-air gel readout." Journal of Physics: Conference Series 573 (January 12, 2015): 012057. http://dx.doi.org/10.1088/1742-6596/573/1/012057.

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28

Babic, Steven, and Kevin Jordan. "The performance of an optical cone-beam CT scanner adapted for radiochromic film dosimetry." Physics in Medicine and Biology 57, no. 21 (October 16, 2012): N377—N389. http://dx.doi.org/10.1088/0031-9155/57/21/n377.

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29

Maxwell, S. K., P. H. Charles, N. Cassim, T. Kairn, and S. B. Crowe. "Assessing the fit of 3D printed bolus from CT, optical scanner and photogrammetry methods." Physical and Engineering Sciences in Medicine 43, no. 2 (March 23, 2020): 601–7. http://dx.doi.org/10.1007/s13246-020-00861-8.

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30

Babic, S., and K. Jordan. "Poster - Thur Eve - 06: Radiochromic Film Densitometry with Vista15 Optical Cone Beam CT Scanner." Medical Physics 37, no. 7Part2 (July 2010): 3887. http://dx.doi.org/10.1118/1.3476111.

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31

Papadakis, A. E., T. G. Maris, G. Zacharakis, V. Papoutsaki, C. Varveris, J. Ripoll, and J. Damilakis. "Technical Note: A fast laser-based optical-CT scanner for three-dimensional radiation dosimetry." Medical Physics 38, no. 2 (January 20, 2011): 830–35. http://dx.doi.org/10.1118/1.3538924.

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32

Sakhalkar, H. S., and M. Oldham. "Fast, high-resolution 3D dosimetry utilizing a novel optical-CT scanner incorporating tertiary telecentric collimation." Medical Physics 35, no. 1 (December 19, 2007): 101–11. http://dx.doi.org/10.1118/1.2804616.

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33

Battista, J., J. Miller, R. Taylor, K. Jordan, and I. MacDonald. "WE-G-BRC-02: A Portable Optical CT Scanner for Interactive Teaching of Imaging Principles." Medical Physics 38, no. 6Part33 (June 2011): 3829. http://dx.doi.org/10.1118/1.3613417.

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34

Takanashi, Takaoki, Kazuya Hayashi, Mikio Nemoto, Hiraku Kawamura, Shin-Ichiro Hayashi, and Hiroaki Gotoh. "Cause of cupping artifacts from radiochromic micelle gel dosimeters used in optical CT scanner measurement." Journal of Physics: Conference Series 1305 (August 2019): 012020. http://dx.doi.org/10.1088/1742-6596/1305/1/012020.

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35

Xu, Y., M. Maryanski, and C. Wuu. "SU-GG-T-357: Initial Evaluation of a Fast Optical CT Scanner for Gel Dosimetry." Medical Physics 37, no. 6Part21 (June 2010): 3268. http://dx.doi.org/10.1118/1.3468754.

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36

Ramm, Daniel, Thomas P. Rutten, Justin Shepherd, and Eva Bezak. "Optical CT scanner for in-air readout of gels for external radiation beam 3D dosimetry." Physics in Medicine and Biology 57, no. 12 (May 30, 2012): 3853–68. http://dx.doi.org/10.1088/0031-9155/57/12/3853.

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37

Xu, Y., Cheng-Shie Wuu, and Marek J. Maryanski. "Performance of a commercial optical CT scanner and polymer gel dosimeters for 3-D dose verification." Medical Physics 31, no. 11 (October 25, 2004): 3024–33. http://dx.doi.org/10.1118/1.1803674.

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38

Lee, S., J. Yi, J. Park, S. Cho, J. Shim, K. Chang, Y. Cao, S. Lee, H. Huh, and C. Kim. "Development of 3D Dosimetry System using Polymer Gel (TENOMAG) and Optical-CT Scanner in Prostate IMRT." International Journal of Radiation Oncology*Biology*Physics 78, no. 3 (November 2010): S748. http://dx.doi.org/10.1016/j.ijrobp.2010.07.1732.

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39

Elbashti, Mahmoud, Pedro Molinero-Mourelle, Himanshi Aggarwal, Amel Aswehlee, Martin Schimmel, Samir Abou-Ayash, Tetsuo Yamamori, Kazuyoshi Baba, and Yuka Sumita. "Feasibility and accuracy of using intraoral scanners to digitize maxillectomy defects for prosthetic rehabilitation: A systematic review." International Journal of Maxillofacial Prosthetics 5, no. 1 (May 17, 2022): 3–9. http://dx.doi.org/10.26629/ijmp.2022.03.

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Анотація:

Purpose: Few studies have focused on the feasibility and accuracy of intraoral digital impressions for maxillectomy defects, especially for extensive soft tissue defects. Using intraoral scanners alone might be feasible for producing maxillary obturator prostheses, albeit with some limitations. It seems logical to investigate this ambiguity. Therefore, this systematic review aimed to assessing the feasibility and accuracy of using intraoral scanners (IOSs) to digitize maxillectomy defects. Materials and Methods: PubMed, the Cochrane Oral Health Group Trials Register, and the Cochrane Central Register of Controlled Trials were electronically searched, and five prosthodontics journals were manually searched for English-language articles published as of December 2020 that assessed the feasibility and accuracy of using intraoral scanners to acquire digital impressions for maxillectomy defects. Results: Two in vitro studies, three clinical studies, six clinical reports, and three techniques were included (N=14). Aramany’s and Brown’s classifications were used to classify defects in twelve and one articles, respectively; the remaining article did not specify defect class. The 3M True definition IOS with Cone-beam computed tomography (CBCT), Computed tomography (CT), and/or optical scanners were used in both in vitro studies, mainly to evaluate accuracy. The Trios 3 scanner was used in nine studies as the main resource for data acquisition (75.0%), whereas the Trophy 3DI, Lava, and Cerec Omnicam scanners were used in three articles (25.0%). Four degrees of feasibility were identified: feasible (14.3%), feasible with limitations (28.6%), feasible with CBCT or CT (35.7%), and feasible with conventional impressions (21.4%). Accuracy was evaluated in four studies but was not mentioned in ten studies. Conclusion: The results revealed a low level of evidence for the feasibility and accuracy of using intraoral scanners to digitize maxillectomy defects. Additional multicenter clinical studies are needed to evaluate the feasibility and accuracy of digital workflow compared with the conventional approach.

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40

Kulczyk, Tomasz, Michał Rychlik, Dorota Lorkiewicz-Muszyńska, Monica Abreu-Głowacka, Agata Czajka-Jakubowska, and Agnieszka Przystańska. "Computed Tomography versus Optical Scanning: A Comparison of Different Methods of 3D Data Acquisition for Tooth Replication." BioMed Research International 2019 (April 10, 2019): 1–7. http://dx.doi.org/10.1155/2019/4985121.

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Objectives. The study aimed to compare the accuracy of different methods of data acquisition and data reconstruction and to assess their usefulness for 3D printing of tooth replicas. Methods. 3-dimensional models of molar and canine teeth obtain utilizing CBCT examination with different protocols, and optical scanning was compared with models derived from micro-computed (micro-CT) examination using Geomagic Studio Qualify software. A pairwise comparison of 3D models with analysis of standard deviation and the value of the mean distance of given surfaces was performed. Results. Standard deviation and the value of the mean distance were lowest for optical scanning followed by CBC in high and standard resolution in all tested protocols. Models, obtained with high-resolution CBCT protocols, of teeth in and outside of alveolar bone showed similar average distance parameters, but standard deviation parameter was significantly lower for models of teeth scanned outside of the socket. Good surface representation on all models was seen at relatively smooth areas while in areas of high changes in the geometry CBCT based models performed inferiorly to those obtained from an optical scanner. Conclusions. In case of teeth of noncomplicated texture, independently from a position (within or outside the alveolar socket), the high-resolution CBCT seems to be a sufficient method to obtain data for 3D printed tooth replica. Optical scanning performs better when a detailed replica is necessary.

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41

Massillon-JL, G., R. Minniti, C. G. Soares, M. J. Maryanski, and S. Robertson. "Characteristics of a new polymer gel for high-dose gradient dosimetry using a micro optical CT scanner." Applied Radiation and Isotopes 68, no. 1 (January 2010): 144–54. http://dx.doi.org/10.1016/j.apradiso.2009.08.016.

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42

Campbell, W., A. Jirasek, and D. Wells. "SU-E-T-95: Imaging Protocol Investigations with a Fan-Beam Optical CT Scanner for 3D Dosimetry." Medical Physics 38, no. 6Part11 (June 2011): 3507. http://dx.doi.org/10.1118/1.3612046.

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43

Begg, J., M. L. Taylor, L. Holloway, T. Kron, and R. D. Franich. "Effect of light source instability on uniformity of 3D reconstructions from a cone beam optical CT scanner." Australasian Physical & Engineering Sciences in Medicine 37, no. 4 (September 28, 2014): 791–98. http://dx.doi.org/10.1007/s13246-014-0302-9.

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44

Doran, Simon J., Koen Klein Koerkamp, Mamdouh A. Bero, Paul Jenneson, Edward J. Morton, and Walter B. Gilboy. "A CCD-based optical CT scanner for high-resolution 3D imaging of radiation dose distributions: equipment specifications, optical simulations and preliminary results." Physics in Medicine and Biology 46, no. 12 (November 14, 2001): 3191–213. http://dx.doi.org/10.1088/0031-9155/46/12/309.

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45

Wuu, C., Y. Wang, X. Qian, Y. Na, J. Adamovics, and A. Xu. "PH-0601 3D dosimetry with a novel fast optical CT scanner utilizing fiber optic taper for collimated images." Radiotherapy and Oncology 161 (August 2021): S466—S468. http://dx.doi.org/10.1016/s0167-8140(21)07373-4.

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46

Cheng-Shie, W., Y. Xu, M. Maryanski, and M. Maryanski. "525 Evaluation of polymer gels and laser-beam optical CT scanner as a 3-D dosimeter for IMRT." European Journal of Cancer Supplements 1, no. 5 (September 2003): S159. http://dx.doi.org/10.1016/s1359-6349(03)90557-x.

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47

Chang, K., S. Lee, J. Shim, Y. Cao, S. Choi, H. Jeong, D. Yang, Y. Park, W. Yoon, and C. Kim. "Which Is an Optimal Dosimeter to New Optical CT Scanner (P3DS) Between BANGkit and PRESAGE? A Feasibility Study for Brain SRT Case." International Journal of Radiation Oncology*Biology*Physics 87, no. 2 (October 2013): S704—S705. http://dx.doi.org/10.1016/j.ijrobp.2013.06.1867.

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48

Zhang, Xuezhu, Simon R. Cherry, Zhaoheng Xie, Hongcheng Shi, Ramsey D. Badawi, and Jinyi Qi. "Subsecond total-body imaging using ultrasensitive positron emission tomography." Proceedings of the National Academy of Sciences 117, no. 5 (January 21, 2020): 2265–67. http://dx.doi.org/10.1073/pnas.1917379117.

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Анотація:

A 194-cm-long total-body positron emission tomography/computed tomography (PET/CT) scanner (uEXPLORER), has been constructed to offer a transformative platform for human radiotracer imaging in clinical research and healthcare. Its total-body coverage and exceptional sensitivity provide opportunities for innovative studies of physiology, biochemistry, and pharmacology. The objective of this study is to develop a method to perform ultrahigh (100 ms) temporal resolution dynamic PET imaging by combining advanced dynamic image reconstruction paradigms with the uEXPLORER scanner. We aim to capture the fast dynamics of initial radiotracer distribution, as well as cardiac motion, in the human body. The results show that we can visualize radiotracer transport in the body on timescales of 100 ms and obtain motion-frozen images with superior image quality compared to conventional methods. The proposed method has applications in studying fast tracer dynamics, such as blood flow and the dynamic response to neural modulation, as well as performing real-time motion tracking (e.g., cardiac and respiratory motion, and gross body motion) without any external monitoring device (e.g., electrocardiogram, breathing belt, or optical trackers).

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Ramm, Daniel. "A fast dual wavelength laser beam fluid-less optical CT scanner for radiotherapy 3D gel dosimetry II: dosimetric performance." Physics in Medicine & Biology 63, no. 4 (February 16, 2018): 045020. http://dx.doi.org/10.1088/1361-6560/aaaa46.

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Papadakis, A. E., T. G. Maris, G. Zacharakis, J. Ripoll, C. Varveris, and J. Damilakis. "Development of a new laser-line and CCD based optical-CT scanner for the readout of 3D radiation dosimeters." Journal of Physics: Conference Series 250 (November 1, 2010): 012025. http://dx.doi.org/10.1088/1742-6596/250/1/012025.

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