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KMID : 0384620090200040324
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Korean Journal of Medical Physics
2009 Volume.20 No. 4 p.324 ~ p.330
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Estimation of CyberKnife Respiratory Tracking System Using Moving Phantom
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Seo Jae-Hyuk
Jang Ji-Sun
Kang Young-Nam
Gwon Soo-Il
Lee Dong-Joon
Choi Byung-Ok
Lim Jong-soo
Shin Hun-Joo
Jung Ji-Young
Choi Ihl-Bohng
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Abstract
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In this study, we evaluated accuracy and usefulness of CyberKnife Respiratory Tracking System (, Accuray, USA) about a moving during stereotactic radiosurgery. For this study, we used moving phantom that can move the target. We also used Respiratory Tracking System called Synchrony of the Cyberknife in order to track the moving target. For treatment planning of the moving target, we obtained an image using 4D-CT. To measure dose distribution and point dose at the moving target, ion chamber (0.62 cc) and gafchromic EBT film were used. We compared dose distribution (80% isodose line of prescription dose) of static target to that of moving target in order to evaluate the accuracy of Respiratory Tracking System. We also measured the point dose at the target. The mean difference of synchronization for TLS (target localization system) and Synchrony were for desynchronization and for synchronization. The mean difference between static target plan and moving target plan using 4D CT images was . And, the accuracy of Respiratory Tracking System was less 1 mm. Estimation of usefulness in Respiratory Tracking System was for inactivity and for activity. The mean difference of absolute dose was in static target and in moving target. As a conclusion, when we treat about the moving target, we consider that it is important to use 4D-CT and the Respiratory Tracking System. In this study, we confirmed the accuracy and usefulness of Respiratory Tracking System in the Cyberknife.
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KEYWORD
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Stereotactic Radiosurgery (SRS), Moving phantom, Cyberknife, Respiratory Tracking System (Synchrony), Target localization system (TLS)
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