Korean J Med Phys.
2009 Sep;20(3):174-179.
Verification of X-sight Lung Tracking System in the CyberKnife
- Affiliations
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- 1Department of Radiation Oncology, College of Medicine, Inha University, Incheon, Korea.
- 2Department of Nuclear Technology, Hanyang University, Seoul, Korea.
- 3Department of Radiation Oncology, College of Medicine, Hanyang University, Seoul, Korea.
- 4Department of Radiation Oncology, Medical Center, Eulji University, Seoul
- 5Department of Radiation Oncology, College of Medicine, Konyang Univerisity, Daejeon, Korea.
- 6Department of Radiation Oncology, College of Medicne, Soonchunhyang University, Seoul, Korea.
- 7Department of Radiation Oncology, College of Medicine, Kwandong Univerisity, Kangrung, Korea.
- 8Department of Radiation Oncology, Gachon, Medical School, Gil Medical, Incheon, Korea.
- 9Department of Radiation Oncology, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea.
- 10Department of Medical Physics, Kyonggi University, Suwon, Korea.
- 11Department of Radiation Oncology, College of Medicine, KyungHee University, Seoul, Korea. ohsd32@naver.com
Abstract
- To track moving tumor in real time, CyberKnife system imports a technique of the synchrony respiratory tracking system. The fiducial marker which are detectable in X-ray images were demand in CyberKnife Robotic radiosurgery system. It issued as reference markers to locate and track tumor location during patient alignment and treatment delivery. Fiducial marker implantation is an invasive surgical operation that carries a relatively high risk of pneumothorax. Most recently, it was developed a direct lung tumor registration method that does not require the use of fiducials. The purpose of this study is to measure the accuracy of target applying X-sight lung tracking using the Gafchromic film in dynamic moving thorax phantom. The X-sight Lung Tracking quality assurance motion phantom simulates simple respiratory motion of a lung tumor and provides Gafchromic dosimetry film-based test capability at locations inside the phantom corresponding to a typical lung tumor. The total average error for the X-sight Lung Tracking System with a moving target was 0.85+/-0.22 mm. The results were considered reliable and applicable for lung tumor treatment in CyberKnife radiosurgery system. Clinically, breathing patterns of patients may vary during radiation therapy. Therefore, additional studies with a set real patient data are necessary to evaluate the target accuracy for the X-sight Lung Tracking system.
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