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논문 기본 정보

자료유형
학술저널
저자정보
조진동 (서울대학교병원) 전민수 (서울대학교병원) 손재만 (서울대학교병원) 안현준 (서울대학교병원) 윤정민 (서울대학교병원) 최창헌 (서울대학교병원) 김정인 (서울대학교병원) 박종민 (서울대학교병원) 김진성 (연세대학교)
저널정보
한국의학물리학회 의학물리 의학물리 제29권 제3호
발행연도
2018.9
수록면
92 - 100 (9page)
DOI
https://doi.org/10.14316/pmp.2018.29.3.92

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The manufacturer of a linear accelerator (LINAC) has reported that the target melting phenomenon could be caused by a non-recommended output setting and the excessive use of monitor unit (MU) with intensity-modulated radiation therapy (IMRT). Due to these reasons, we observed an unexpected beam interruption during the treatment of a patient in our institution. The target status was inspected and a replacement of the target was determined. After the target replacement, the beam profile was adjusted to the machine commissioning beam data, and the absolute doses-to-water for 6 MV and 10 MV photon beams were calibrated according to American Association of Physicists in Medicine (AAPM) Task Group (TG)-51 protocol. To verify the beam data after target replacement, the beam flatness, symmetry, output factor, and percent depth dose (PDD) were measured and compared with the commissioning data. The difference between the referenced and measured data for flatness and symmetry exhibited a coincidence within 0.3% for both 6 MV and 10 MV, and the difference of the PDD at 10 cm depth (PDD10) was also within 0.3% for both photon energies. Also, patient-specific quality assurances (QAs) were performed with gamma analysis using a 2-D diode and ion chamber array detector for eight patients. The average gamma passing rates for all patients for the relative dose distribution was 99.1%±1.0%, and those for absolute dose distribution was 97.2%±2.7%, which means the gamma analysis results were all clinically acceptable. In this study, we recommend that the beam characteristics, such as beam profile, depth dose, and output factors, should be examined. Further, patient-specific QAs should be performed to verify the changes in the overall beam delivery system when a target replacement is inevitable; although it is more important to check the beam output in a daily routine.

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