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Fundamental study on quality assurance (QA) procedures for a real-time tumor tracking radiotherapy (RTRT) system from the viewpoint of imaging devices

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Title: Fundamental study on quality assurance (QA) procedures for a real-time tumor tracking radiotherapy (RTRT) system from the viewpoint of imaging devices
Authors: Kimura, Suguru Browse this author
Miyamoto, Naoki Browse this author →KAKEN DB
Sutherland, Kenneth L. Browse this author →KAKEN DB
Suzuki, Ryusuke Browse this author →KAKEN DB
Shirato, Hiroki Browse this author →KAKEN DB
Ishikawa, Masayori Browse this author →KAKEN DB
Keywords: image quality
quality assurance
quality assurance for imaging devices
quality control
real-time tumor tracking
Issue Date: 2-Jun-2021
Publisher: John Wiley & Sons
Journal Title: Journal of applied clinical medical physics
Volume: 22
Issue: 7
Start Page: 165
End Page: 176
Publisher DOI: 10.1002/acm2.13307
Abstract: Purpose: The real-time tumor tracking radiotherapy (RTRT) system requires periodic quality assurance (QA) and quality control. The goal of this study is to propose QA procedures from the viewpoint of imaging devices in the RTRT system. Methods: Tracking by the RTRT system (equips two sets of colored image intensifiers (colored I.I.s) fluoroscopy units) for the moving gold-marker (diameter 2.0 mm) in a rotating phantom were performed under various X-ray conditions. To analyze the relationship between fluoroscopic image quality and precision of gold marker coordinate calculation, the standard deviation of the 3D coordinate (sigma 3D [mm]) of the gold marker, the mean of the pattern recognition score (PRS) and the standard deviation of the distance between rays (DBR) (sigma DBR [mm]) were evaluated. Results: When tracking with speed of 10-60 mm/s, sigma DBR increased, though the mean PRS did not change significantly (p>0.05). On the contrary, the mean PRS increased depending on the integral noise equivalent quanta (integral NEQ) that is an indicator of image quality calculated from the modulation transfer function (MTF) as an indicator of spatial resolution and the noise power spectrum (NPS) as an indicator of noise characteristic. Conclusion: The indicators of NEQ, MTF, and NPS were useful for managing the tracking accuracy of the RTRT system. We propose observing the change of these indicators as additional QA procedures for each imaging device from the commissioning baseline.
Type: article
URI: http://hdl.handle.net/2115/82339
Appears in Collections:保健科学院・保健科学研究院 (Graduate School of Health Sciences / Faculty of Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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