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KMID : 0364920090340030137
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Journal of Radiation Protection and Research
2009 Volume.34 No. 3 p.137 ~ p.143
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Accuracy Evaluation of CyberKnife Synchrony TM Respiratory Tracking System Using Phantom
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Kim Gha-Jung
Kim Chong-Yeal
Lim Chang-Seon
Bae Seok-Hwan
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Abstract
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This study was conducted to evaluate the accuracy of CyberKnife Synchrony TM respiratory tracking system which was applied to Stereotactic Radiosurgery (SRS) for moving tumors in chest and abdomen with breathing motion. For accurate evaluation, gold fiducial marks were implanted into a moving phantom. The moving phantom was a cube imbedding an acryl ball as a target. The acryl ball was prescribed to 20 Gy at 70% of isodose curve in a virtual treatment and radiochromic films were inserted into the acryl ball for dose verification and tracking accuracy evaluation. The evaluation of position tracking consists of two parts: fiducial mark tracking in a stationary phantom and Synchrony TM respiratory tracking in a moving phantom. Each measurement was done in three directions and was repeated to 5 times. Range of position error was 0.1957 mm to 0.6520 mm in the stationary phantom and 0.4405 mm to 0.7665 mm in the moving phantom. Average position error was 0.3926 mm and 0.5673 mm in the stationary phantom and the moving phantom respectively. This study evaluates the accuracy of CyberKnife Synchrony TM Respiratory tracking system, and confirms the usefulness when it’s used for Stereotactic Radiosurgery of body organs.
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KEYWORD
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CyberKnife, Synchrony TM, Respiratory tracking system, Stereotactic Body Radiotherapy, Stereotactic Radiosurgery
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