Abstract:Objective To verify the reconstruction parameters of the multi-channel cylinder applicator from template, and to complete
the end-to-end test before clinical use. Methods The 3D printed self-made phantom, multi-channel applicator, CC13 ionization
chamber and EBT3 film was used to complete the ETE test. Target area 1 and target area 2 were set at both ends of the applicator,
respectively, to complete the simulation plan design of the prescribed dose of 5~7 Gy and conduct irradiation, to obtain the measured
point dose and surface dose, and compare with the TPS dose. The dose thresholds of 2 mm/2% and 10% were used as evaluation
criteria, and the difference of plane dose distribution was analyzed by γ method. Results The reconstruction parameters of the
multi-channel cylinder meet the nominal range. After the reconstruction using the TPS template, the parameters need to be partially
changed. The tip length at the top of the central catheter is changed to 5.8 mm, and the surrounding catheters are changed to 4 mm,
of which the source length is corrected to 1493 mm. The measurement deviation of ionization chamber was 0.97±0.32%, and the
deviation of high dose area was smaller than that of low dose area. The results of the film dose analysis were in good agreement with
the dose distribution of the TPS. The passing rate of γ in the sagittal plane was 97.4%, 98.2% and 98.8%, in the horizontal plane was
99.3%, 98.4% and 98.7%, respectively. The average passing rate of γ was 98.5±0.63%. Conclusion Parameters of the new type
of multi-channel cylinder applicator should be measured before clinical use and to adjust the parameters of the template accordingly.
Through the ETE test, it is confirmed that the point dose and plane dose measurement results are satisfactory, which support the
applicator for clinical use.
于浪,杨波,刘峡,庞廷田,刘楠,李文博,董婷婷,王贝,汪之群,张杰,梁永广,邱杰. 多通道柱状施源器端到端测试[J]. 中国医疗设备, 2021, 36(4): 104-107.
YU Lang, YANG Bo, LIU Xia, PANG Tingtian, LIU Nan, LI Wenbo, DONG Tingting, WANG Bei,
WANG Zhiqun, ZHANG Jie, LIANG Yongguang, QIU Jie. End-To-End Test of Multi-channel Cylinder Applicator. China Medical Devices, 2021, 36(4): 104-107.