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Evaluation of tracking accuracy of the CyberKnife system using a webcam and printed calibrated grid

Tracking accuracy for the CyberKnife's Synchrony system is commonly evaluated using a film‐based verification method. We have evaluated a verification system that uses a webcam and a printed calibrated grid to verify tracking accuracy over three different motion patterns. A box with an attached...

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Autores principales: Sumida, Iori, Shiomi, Hiroya, Higashinaka, Naokazu, Murashima, Yoshikazu, Miyamoto, Youichi, Yamazaki, Hideya, Mabuchi, Nobuhisa, Tsuda, Eimei, Ogawa, Kazuhiko
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5875552/
https://www.ncbi.nlm.nih.gov/pubmed/27074474
http://dx.doi.org/10.1120/jacmp.v17i2.5914
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author Sumida, Iori
Shiomi, Hiroya
Higashinaka, Naokazu
Murashima, Yoshikazu
Miyamoto, Youichi
Yamazaki, Hideya
Mabuchi, Nobuhisa
Tsuda, Eimei
Ogawa, Kazuhiko
author_facet Sumida, Iori
Shiomi, Hiroya
Higashinaka, Naokazu
Murashima, Yoshikazu
Miyamoto, Youichi
Yamazaki, Hideya
Mabuchi, Nobuhisa
Tsuda, Eimei
Ogawa, Kazuhiko
author_sort Sumida, Iori
collection PubMed
description Tracking accuracy for the CyberKnife's Synchrony system is commonly evaluated using a film‐based verification method. We have evaluated a verification system that uses a webcam and a printed calibrated grid to verify tracking accuracy over three different motion patterns. A box with an attached printed calibrated grid and four fiducial markers was attached to the motion phantom. A target marker was positioned at the grid's center. The box was set up using the other three markers. Target tracking accuracy was evaluated under three conditions: 1) stationary; 2) sinusoidal motion with different amplitudes of 5, 10, 15, and 20 mm for the same cycle of 4 s and different cycles of 2, 4, 6, and 8 s with the same amplitude of 15 mm; and 3) irregular breathing patterns in six human volunteers breathing normally. Infrared markers were placed on the volunteers’ abdomens, and their trajectories were used to simulate the target motion. All tests were performed with one‐dimensional motion in craniocaudal direction. The webcam captured the grid's motion and a laser beam was used to simulate the CyberKnife's beam. Tracking error was defined as the difference between the grid's center and the laser beam. With a stationary target, mean tracking error was measured at 0.4 mm. For sinusoidal motion, tracking error was less than 2 mm for any amplitude and breathing cycle. For the volunteers’ breathing patterns, the mean tracking error range was 0.78‐1.67 mm. Therefore, accurate lesion targeting requires individual quality assurance for each patient. PACS number(s): 87.55.D‐, 87.55.km, 87.55.Qr, 87.56.Fc
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spelling pubmed-58755522018-04-02 Evaluation of tracking accuracy of the CyberKnife system using a webcam and printed calibrated grid Sumida, Iori Shiomi, Hiroya Higashinaka, Naokazu Murashima, Yoshikazu Miyamoto, Youichi Yamazaki, Hideya Mabuchi, Nobuhisa Tsuda, Eimei Ogawa, Kazuhiko J Appl Clin Med Phys Radiation Oncology Physics Tracking accuracy for the CyberKnife's Synchrony system is commonly evaluated using a film‐based verification method. We have evaluated a verification system that uses a webcam and a printed calibrated grid to verify tracking accuracy over three different motion patterns. A box with an attached printed calibrated grid and four fiducial markers was attached to the motion phantom. A target marker was positioned at the grid's center. The box was set up using the other three markers. Target tracking accuracy was evaluated under three conditions: 1) stationary; 2) sinusoidal motion with different amplitudes of 5, 10, 15, and 20 mm for the same cycle of 4 s and different cycles of 2, 4, 6, and 8 s with the same amplitude of 15 mm; and 3) irregular breathing patterns in six human volunteers breathing normally. Infrared markers were placed on the volunteers’ abdomens, and their trajectories were used to simulate the target motion. All tests were performed with one‐dimensional motion in craniocaudal direction. The webcam captured the grid's motion and a laser beam was used to simulate the CyberKnife's beam. Tracking error was defined as the difference between the grid's center and the laser beam. With a stationary target, mean tracking error was measured at 0.4 mm. For sinusoidal motion, tracking error was less than 2 mm for any amplitude and breathing cycle. For the volunteers’ breathing patterns, the mean tracking error range was 0.78‐1.67 mm. Therefore, accurate lesion targeting requires individual quality assurance for each patient. PACS number(s): 87.55.D‐, 87.55.km, 87.55.Qr, 87.56.Fc John Wiley and Sons Inc. 2016-03-08 /pmc/articles/PMC5875552/ /pubmed/27074474 http://dx.doi.org/10.1120/jacmp.v17i2.5914 Text en © 2016 The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/3.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Radiation Oncology Physics
Sumida, Iori
Shiomi, Hiroya
Higashinaka, Naokazu
Murashima, Yoshikazu
Miyamoto, Youichi
Yamazaki, Hideya
Mabuchi, Nobuhisa
Tsuda, Eimei
Ogawa, Kazuhiko
Evaluation of tracking accuracy of the CyberKnife system using a webcam and printed calibrated grid
title Evaluation of tracking accuracy of the CyberKnife system using a webcam and printed calibrated grid
title_full Evaluation of tracking accuracy of the CyberKnife system using a webcam and printed calibrated grid
title_fullStr Evaluation of tracking accuracy of the CyberKnife system using a webcam and printed calibrated grid
title_full_unstemmed Evaluation of tracking accuracy of the CyberKnife system using a webcam and printed calibrated grid
title_short Evaluation of tracking accuracy of the CyberKnife system using a webcam and printed calibrated grid
title_sort evaluation of tracking accuracy of the cyberknife system using a webcam and printed calibrated grid
topic Radiation Oncology Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5875552/
https://www.ncbi.nlm.nih.gov/pubmed/27074474
http://dx.doi.org/10.1120/jacmp.v17i2.5914
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