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 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.
Journal
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- Progress in Biomedical Optics and Imaging - Proceedings of SPIE
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Progress in Biomedical Optics and Imaging - Proceedings of SPIE 7622 (PART 3), 76224S-, 2010-01-01
Society of Photo-optical Instrumentation Engineers (SPIE)
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Details 詳細情報について
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- CRID
- 1390859758186619136
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- NII Article ID
- 120005253827
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- ISSN
- 16057422
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- Web Site
- http://hdl.handle.net/2297/34125
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- CiNii Articles