Development of Optical Fiber Based Measurement System for the Verification of Entrance Dose Map in Pencil Beam Scanning Proton Beam.
Development of Optical Fiber Based Measurement System for the Verification of Entrance Dose Map in Pencil Beam Scanning Proton Beam.
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DOI：
10.3390/s18010227
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发表时间：
2018-01-15
期刊：
影响因子：
--
通讯作者：
Shin D
中科院分区：
文献类型：
--
作者：
Son J;Lee SB;Lim Y;Park SY;Cho K;Yoon M;Shin D
介绍了基于光纤辐射传感器(FORS)的铅笔束扫描(PBS)质子治疗入射剂量图验证束流监测系统的研制，并通过可行性研究对该系统进行了验证。光束监测系统由128根光纤组成，光纤连接到光电倍增管上。通过比较使用Matrixx和EBT3胶片等常规剂量计获得的不同大小正方形野的二维剂量图与使用FORS测量的剂量图，验证了基于FORS的束流监测系统的性能。对PbS质子束的半峰全宽和半影全宽进行了比较，每个值之间的≤相差2%，这表明使用传统剂量测量工具的测量结果与基于FORS的测量结果相对应。对于不规则形野，使用Matrixx和EBT3胶片获得的2D剂量图与FORS测量的2D剂量图的伽马指数比较，通过率分别为96.9±1.3%和96.2±1.9%，证实了基于FORS的PBS质子治疗测量结果与传统剂量学工具测量的结果吻合良好。这些结果表明，所研制的基于FORS的束流监测系统是监测PbS质子治疗入射剂量图的理想方案。
This study describes the development of a beam monitoring system for the verification of entrance dose map in pencil beam scanning (PBS) proton therapy based on fiber optic radiation sensors (FORS) and the validation of this system through a feasibility study. The beam monitoring system consisted of 128 optical fibers optically coupled to photo-multiplier tubes. The performance of the beam monitoring system based on FORS was verified by comparing 2D dose maps of square-shaped fields of various sizes, which were obtained using conventional dosimeters such as MatriXX and EBT3 film, with those measured using FORS. The resulting full-width at half maximum and penumbra were compared for PBS proton beams, with a ≤2% difference between each value, indicating that measurements using the conventional dosimetric tool corresponded to measurements based on FORS. For irregularly-shaped fields, a comparison based on the gamma index between 2D dose maps obtained using MatriXX and EBT3 film and the 2D dose map measured by the FORS showed passing rates of 96.9 ± 1.3% and 96.2 ± 1.9%, respectively, confirming that FORS-based measurements for PBS proton therapy agreed well with those measured using the conventional dosimetric tools. These results demonstrate that the developed beam monitoring system based on FORS is good candidate for monitoring the entrance dose map in PBS proton therapy.
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