Korean J Med Phys.
2009 Dec;20(4):324-330.
Estimation of CyberKnife Respiratory Tracking System Using Moving Phantom
- Affiliations
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- 1Cyberknife Clinic, Wooridul Spine Hospital,Seoul, Korea.
- 2Department of Radiation Oncology, Seoul, Korea. k3yn@catholic.ac.kr
- 3Cyberknife Center, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
- 4Department of Radiation Oncology, Incheon St. Mary's Hospital, Incheon, Korea.
- 5Department of Neurosurgery, Ilsan Paik Hospital, College of Medicine, Inje University, Goyang, Korea.
- 6Department of Medical Physics, Graduate School of Kyonggi University, Suwon, Korea.
Abstract
- In this study, we evaluated accuracy and usefulness of CyberKnife Respiratory Tracking System (SynchronyTM, 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 11.5+/-3.09 mm for desynchronization and 0.14+/-0.08 mm for synchronization. The mean difference between static target plan and moving target plan using 4D CT images was 0.18+/-0.06 mm. And, the accuracy of Respiratory Tracking System was less 1 mm. Estimation of usefulness in Respiratory Tracking System was 17.39+/-0.14 mm for inactivity and 1.37+/-0.11 mm for activity. The mean difference of absolute dose was 0.68+/-0.38% in static target and 1.31+/-0.81% 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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