A motion-compensated image filter for low-dose fluoroscopy in a real-time tumor-tracking radiotherapy system

Miyamoto, Naoki; Ishikawa, Masayori; Sutherland, Kenneth; Suzuki, Ryusuke; Matsuura, Taeko; Toramatsu, Chie; Takao, Seishin; Nihongi, Hideaki; Shimizu, Shinichi; Umegaki, Kikuo; Shirato, Hiroki

A motion-compensated image filter for low-dose fluoroscopy in a real-time tumor-tracking radiotherapy system

Miyamoto, Naoki; Ishikawa, Masayori; Sutherland, Kenneth et al.

Journal Of Radiation Research, 2015, 56(1), 186-196

Permalink : https://hdl.handle.net/2115/58563

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アクセス権	open access
URI	https://hdl.handle.net/2115/58563
タイトル	A motion-compensated image filter for low-dose fluoroscopy in a real-time tumor-tracking radiotherapy system
著者	Miyamoto, Naoki ; Ishikawa, Masayori ; Sutherland, Kenneth ; Suzuki, Ryusuke ; Matsuura, Taeko ; Toramatsu, Chie ; Takao, Seishin ; Nihongi, Hideaki ; Shimizu, Shinichi ; Umegaki, Kikuo ; Shirato, Hiroki
e-Rad_Researcher 00552879 著者名 Miyamoto, Naoki
e-Rad_Researcher 80314772 著者名 Ishikawa, Masayori
e-Rad_Researcher 30451446 著者名 Sutherland, Kenneth
e-Rad_Researcher 00400052 著者名 Suzuki, Ryusuke
e-Rad_Researcher 90590266 著者名 Matsuura, Taeko
著者名 Toramatsu, Chie
e-Rad_Researcher 10614216 著者名 Takao, Seishin
著者名 Nihongi, Hideaki
e-Rad_Researcher 50463724 著者名 Shimizu, Shinichi
e-Rad_Researcher 40643193 著者名 Umegaki, Kikuo
e-Rad_Researcher 20187537 著者名 Shirato, Hiroki
言語	英語
キーワード	respiratory-gated radiotherapy
	real-time tracking
	respiratory motion
	image processing
	motion compensation
	imaging dose
発行日	2015-01
出版者	Oxford University Press
収録物名	Journal Of Radiation Research
巻(号)	56(1)
ページ	186-196
抄録	In the real-time tumor-tracking radiotherapy system, a surrogate fiducial marker inserted in or near the tumor is detected by fluoroscopy to realize respiratory-gated radiotherapy. The imaging dose caused by fluoroscopy should be minimized. In this work, an image processing technique is proposed for tracing a moving marker in low-dose imaging. The proposed tracking technique is a combination of a motion-compensated recursive filter and template pattern matching. The proposed image filter can reduce motion artifacts resulting from the recursive process based on the determination of the region of interest for the next frame according to the current marker position in the fluoroscopic images. The effectiveness of the proposed technique and the expected clinical benefit were examined by phantom experimental studies with actual tumor trajectories generated from clinical patient data. It was demonstrated that the marker motion could be traced in low-dose imaging by applying the proposed algorithm with acceptable registration error and high pattern recognition score in all trajectories, although some trajectories were not able to be tracked with the conventional spatial filters or without image filters. The positional accuracy is expected to be kept within +/- 2 mm. The total computation time required to determine the marker position is a few milliseconds. The proposed image processing technique is applicable for imaging dose reduction.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution-NonCommercial 4.0 International
PISSN	0449-3060
関連情報	PMID 25129556
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1093/jrr/rru069