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Proceedings Paper

Effects of image lag on real-time target tracking in radiotherapy
Author(s): Rie Tanaka; Katsuhiro Ichikawa; Shinichiro Mori; Suguru Dobashi; Motoki Kumagaya; Hiroki Kawashima; Shinichi Morita; Shigeru Sanada
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Paper Abstract

There is a concern that image lag may reduce accuracy of real-time target tracking in radiotherapy. This study was performed to investigate influence of image lag on the accuracy of target tracking in radiotherapy. Fluoroscopic images were obtained using a direct type of dynamic flat-panel detector (FPD) system under conditions of target tracking during radiotherapy. The images continued to be read out after X-irradiations and cutoff, and image lag properties in the system were then determined. Subsequently, a tungsten materials plate with a precision edge was mounted on to a motor control device, which provided a constant velocity. The plate was moved into the center of the detector at movement rate of 10 and 20 mm/s, covering lung tumor movement of normal breathing, and MTF and profile curves were measured on the edges covering and uncovering the detector. A lung tumor with blurred edge due to image lag was simulated using the results and then superimposed on breathing chest radiographs of a patient. The moving target with and without image lag was traced using a template-matching technique. In the results, the target could be traced within a margin for error in external radiotherapy. The results indicated that there was no effect of image lag on target tracking in usual breathing speed in a radiotherapy situation. Further studies are required to investigate influence by the other factors, such as exposure dose, target size and shape, imaging rate, and thickness of a patient's body.

Paper Details

Date Published: 4 March 2010
PDF: 10 pages
Proc. SPIE 7622, Medical Imaging 2010: Physics of Medical Imaging, 76224S (4 March 2010); doi: 10.1117/12.844202
Show Author Affiliations
Rie Tanaka, College of Medical, Pharmaceutical, and Health Sciences, Kanazawa Univ. (Japan)
Katsuhiro Ichikawa, College of Medical, Pharmaceutical, and Health Sciences, Kanazawa Univ. (Japan)
Shinichiro Mori, National Institute of Radiological Sciences (Japan)
Suguru Dobashi, National Institute of Radiological Sciences (Japan)
Motoki Kumagaya, National Institute of Radiological Sciences (Japan)
Hiroki Kawashima, College of Medical, Pharmaceutical, and Health Sciences, Kanazawa Univ. (Japan)
Shinichi Morita, National Institute of Radiological Sciences (Japan)
Shigeru Sanada, College of Medical, Pharmaceutical, and Health Sciences, Kanazawa Univ. (Japan)


Published in SPIE Proceedings Vol. 7622:
Medical Imaging 2010: Physics of Medical Imaging
Ehsan Samei; Norbert J. Pelc, Editor(s)

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