Abstract：Objective According to the verification results of the intensity modulated radiotherapy treatment plan using IBA MatriXX
with the other results of the quality assurance (QA) method, the Synergy accelerator 10 MV Xray flatness and symmetry was found to
exceed the standard, the causes were analyzed, and the three-dimensional water tank measurement was used to confirm the problem
and solve the problem by adjustment. Methods A batch of Synergy accelerator 10 MV IMRT plans were found to have a low
Gamma pass rate and obvious problems in the second quadrant of plane dose by using IBA MatriXX flatting dose verification system
before radiotherapy, and the Synergy accelerator 10 MV Flatness and Symmetry were found to be excessive in combination with
PTW quickcheck daily surveyor. Through detailed data analysis and the use of MatriXX to inspect the 10 MV X-ray 10 cm×10 cm
field profile, it was preliminarily determined that the 10 MV flatness and symmetry of the synergy accelerator exceeded the standard,
and then the profile was further detected by the three-dimensional water tank and the absolute dose was measured by the ionization
chamber. Finally the reason for the abnormal result was confirmed. Results Under the three-dimensional water tank inspection, it
was found that the 10 MV X-ray profile of the Synergy accelerator exceeded the standard in the G-T and A-B directions. The absolute
dose recheck was normal and adjusted to the normal range. Re-doing the verification of this batch of strengthening plan, Gamma
analysis all passed. Conclusion Intensity modulated radiation plan is an important means of radiotherapy QA, which can timely find
all kinds of problems of accelerator machinery and dose including MLC, and combined with other QA method plays an important
role in the presice radiotherapy quality control.
孔旭东，孔栋. MatriXX调强验证在精确放疗质量控制中的作用[J]. 中国医疗设备, 2021, 36(12): 54-57.
KONG Xudong, KONG Dong. Role of the IMRT Dose Verification with MatriXX in the Quality Control of Precise Radiotherapy. China Medical Devices, 2021, 36(12): 54-57.
