Isocenter Check and QA of the Stereotactic Radiosurgery Devices Using EPID

Kyo Chul Shin; Sang Gyu Choi; Jung Kee Kim; Dong Hyeok Jeong

Article

Original Article

Korean Journal of Medical Physics 2014; 25(4): 281-287

Published online December 30, 2014

Isocenter Check and QA of the Stereotactic Radiosurgery Devices Using EPID

Kyo Chul Shin^*, Sang Gyu Choi^*, Jung Kee Kim^†, Dong Hyeok Jeong^†

Author Info ⁺

^*Department of Radiation Oncology, Dankook University Hospital, Cheonan,^†Research Center, Dongnam Institute of Radiological and Medical Sciences, Busan, Korea

Received: December 5, 2014; Revised: December 15, 2014; Accepted: December 20, 2014

Abstract

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Abstract

The Winston Lutz test, which checks the accuracy of the isocenter for stereotactic radiosurgery (SRS), was performed with the commercial electronic portal imaging device (EPID). The usual Winston Lutz test with film was also performed for comparison with the test with EPID. The maximum difference in isocenter between the two methods was 0.32 mm. The Winston Lutz test using EPID is practical as it can reduce time and avoid human errors compared to the test with film.

KeywordsSRS, EPID, Winston Lutz Test, Quality assurance