earticle

영어

This study was conducted to evaluate the accuracy of CyberKnife SynchronyTMrespiratory tracking system which wasapplied 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. Theacryl ball was prescribed to 20 Gy at 70% of isodose curve in a virtual treatment and radiochromic films were inserted into the acrylball for dose verification and tracking accuracy evaluation. The evaluation of position tracking consists of two parts: fiducial marktracking in a stationary phantom and SynchronyTMrespiratory tracking in a moving phantom. Each measurement was done in threedirections 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 mmto 0.7665 mm in the moving phantom. Average position error was 0.3926 mm and 0.5673 mm in the stationary phantom and themoving phantom respectively. This study evaluates the accuracy of CyberKnife SynchronyTMRespiratory tracking system, and confirmsthe usefulness when it’s used for Stereotactic Radiosurgery of body organs.