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Proceedings Paper

Improvement of tracking accuracy and stability by recursive image processing in real-time tumor-tracking radiotherapy system
Author(s): Naoki Miyamoto; Kenneth Sutherland; Ryusuke Suzuki; Taeko Matsuura; Chie Toramatsu; Seishin Takao; Hideaki Nihongi; Rumiko Kinoshita; Shinichi Shimizu; Rikiya Onimaru; Kikuo Umegaki; Hiroki Shirato; Masayori Ishikawa
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Paper Abstract

In the real-time tumor-tracking radiotherapy (RTRT) system, the fiducial markers are inserted in or near the target tumor in order monitor the respiratory-induced motion of tumors. During radiation treatment, the markers are detected by continuous fluoroscopy operated at 30 frames/sec. The marker position is determined by means of a template pattern matching technique which is based on the normalized cross correlation. With high tube voltage, large current and long exposure, the fiducial marker will be recognized accurately, however, the radiation dose due to X-ray fluoroscopy increases. On the other hand, by decreasing the fluoroscopy parameter settings, the fiducial marker could be lost because the effect of statistical noise is increased. In the respiratory-gated radiotherapy, the error of the image guidance will induce the reduction of the irradiation efficiency and accuracy. In order to track the marker stably and accurately in low dose fluoroscopy, we propose the application of a recursive filter. The effectiveness of the image processing is investigated by tracking the static marker and the dynamic marker. The results suggest that the stability and the accuracy of the marker tracking can be improved by applying the recursive image filter in low dose imaging.

Paper Details

Date Published: 16 February 2012
PDF: 8 pages
Proc. SPIE 8316, Medical Imaging 2012: Image-Guided Procedures, Robotic Interventions, and Modeling, 83160B (16 February 2012); doi: 10.1117/12.912734
Show Author Affiliations
Naoki Miyamoto, Hokkaido Univ. (Japan)
Kenneth Sutherland, Hokkaido Univ. (Japan)
Ryusuke Suzuki, Hokkaido Univ. Hospital (Japan)
Taeko Matsuura, Hokkaido Univ. (Japan)
Chie Toramatsu, Hokkaido Univ. (Japan)
Seishin Takao, Hokkaido Univ. (Japan)
Hideaki Nihongi, Hokkaido Univ. (Japan)
Rumiko Kinoshita, Hokkaido Univ. (Japan)
Shinichi Shimizu, Hokkaido Univ. (Japan)
Rikiya Onimaru, Hokkaido Univ. (Japan)
Kikuo Umegaki, Hokkaido Univ. (Japan)
Hiroki Shirato, Hokkaido Univ. (Japan)
Masayori Ishikawa, Hokkaido Univ. (Japan)

Published in SPIE Proceedings Vol. 8316:
Medical Imaging 2012: Image-Guided Procedures, Robotic Interventions, and Modeling
David R. Holmes III; Kenneth H. Wong, Editor(s)

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