@article{oai:kanazawa-u.repo.nii.ac.jp:00013789,
 author = {田中, 利恵 and 市川, 勝弘 and 川嶋, 広貴 and 真田, 茂 and Tanaka, Rie and Ichikawa, Katsuhiro and Mori, Shinichiro and Dobashi, Suguru and Kumagaya, Motoki and Kawashima, Hiroki and Morita, Shinichi and Sanada, Shigeru},
 issue = {PART 3},
 journal = {Progress in Biomedical Optics and Imaging - Proceedings of SPIE},
 month = {Jan},
 note = {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 image: 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 1 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 ii 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 a: exposure dose, target size and shape, imaging rate, and thickness of a patient's body. © 2010 SPIE.},
 title = {Effects of image lag on real-time target tracking in radiotherapy},
 volume = {7622},
 year = {2010}
}