척추 방사선수술 시 다엽콜리메이터 위치 오차의 임상적 위험성 평가

• Published in: 방사선기술과학 Vol. 46; no. 6; pp. 527 - 533
• Main Authors: 강동진(Dong‑Jin Kang), 오건(Geon Oh), 신영주(Young‑Joo Shin), 강진규(Jin-Kyu Kang), 정재용(Jae-Yong Jung), 이보람(Boram Lee)
• Format: Journal Article
• Language: Korean
• Published: 대한방사선과학회(구 대한방사선기술학회) 31.12.2023; KOREAN SOCIETY OF RADIOLOGICAL TECHNOLOGY; 대한방사선과학회
• Subjects: 방사선과학; 전산모사 알고리즘; Multi-leaf collimator positioning error; Dose verification program; 척추 방사선수술; Monte-Carlo algorithm; 선량 검증 프로그램; Stoichiometric calibration; 화학 양론적 교정; Spinal radiosurgery; 다엽콜리메이터 위치 오차
• ISSN: 2288-3509; 2384-1168

The purpose of this study is to evaluate the clinical risk of spinal radiosurgery by calculating the dose difference due to dose calculation algorithm and multi-leaf collimator positioning error. The images acquired by the CT simulator were recalculated by correcting the multi-leaf collimator position in the dose verification program created using MATLAB and applying stoichiometric calibration and Monte Carlo algorithm. With multi-leaf collimator positioning error, the clinical target volume (CTV) showed a dose difference of up to 13% in the dose delivered to the 95% volume, while the gross tumor volume (GTV) showed a dose difference of 9%. The average dose delivered to the total volume showed dose variation from -8.9% to 9% and -10.1% to 10.2% for GTV and CTV, respectively. The maximum dose delivered to the total volume of the spinal cord showed a dose difference from -14.2% to 19.6%, and the dose delivered to the 0.35 ㎤ volume showed a dose difference from -15.5% to 19.4%. In future research, automating the linkage between treatment planning systems and dose verification programs would be useful for spinal radiosurgery.