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Proceedings Paper

Tumor image extraction from fluoroscopy for a markerless lung tumor motion tracking and prediction
Author(s): Noriyasu Homma; Keita Ishihara; Yoshihiro Takai; Haruna Endo; Kei Ichiji; Masao Sakai; Yuichiro Narita; Makoto Abe; Norihiro Sugita; Makoto Yoshizawa
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Paper Abstract

We develop a markerless tumor motion tracking technique for accurate and safer image-guided radiation therapy (IGRT). The technique is implemented based on a new image model of the moving tumor and the background structure in an x-ray fluorocopic image sequence. By using the technique, the moving tumor image can be extracted from the sequential fluoroscopic images. The extraction from the fluoroscopy is obviously ill- posed, but we have suggested that it can be regularized into a well-posed problem by temporally accumulating constraints that must be satisfied by the extracted tumor image and the background. In this paper, the effect of the tumor extraction and motion of both the tumor and background in the image model is extensively studied on the tracking accuracy. The tracking accuracy of the proposed method with extraction of both the moving tumor and background was within $0.2$ mm of the spatial resolution for a phantom dataset. The accuracy within 1 mm can be clinically sufficient and is superior to the results by the previous method with extraction model of only the moving tumor and by a conventional method without extraction. Thus, the results clearly demonstrate the efficiency and usefulness of the proposed extraction model for the IGRT.

Paper Details

Date Published: 17 February 2012
PDF: 7 pages
Proc. SPIE 8316, Medical Imaging 2012: Image-Guided Procedures, Robotic Interventions, and Modeling, 831639 (17 February 2012); doi: 10.1117/12.911960
Show Author Affiliations
Noriyasu Homma, Tohoku Univ. (Japan)
Keita Ishihara, Tohoku Univ. (Japan)
Yoshihiro Takai, Hirosaki Univ. Graduate School of Medicine (Japan)
Haruna Endo, St. Luke's International Hospital (Japan)
Kei Ichiji, Tohoku Univ. (Japan)
Masao Sakai, Tohoku Univ. (Japan)
Yuichiro Narita, Hirosaki Univ. Graduate School of Medicine (Japan)
Makoto Abe, Tohoku Univ. (Japan)
Norihiro Sugita, Tohoku Univ. (Japan)
Makoto Yoshizawa, Tohoku Univ. (Japan)


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

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