A 'quad-phantom' film dosimeter for use as a multi-planar verification tool for PRESAGE/optical-CT.
A 'quad-phantom' film dosimeter for use as a multi-planar verification tool for PRESAGE/optical-CT.
复制标题
“四体模”胶片剂量计，用作 PRESAGE/光学 CT 的多平面验证工具。
DOI：
10.1088/1742-6596/250/1/012097
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Oldham,M
中科院分区：
文献类型：
--
作者：
Stunja,L;Thomas,A;Adamovics,J;Deasy,J;Oldham,M
IntroductionTo develop and characterize the accuracy and reproducibility of a'quad-phantom'dosimeter which will serve as an independent verification tool during commissioning of a PRESAGE/optical-CT 3D dosimetry system.MethodsA 16cm× 12cm cylindrical quad-phantom was constructed from four pieces of solid polyurethane mimicking the PRESAGE material. Films were placed and anchored in orthogonal planes and the quad-phantom was fastened tightly together and placed in a water-filled Styrofoam container for irradiation. A simple, two-field plan consisting of 6× 6cm anterior-posterior and right-lateral 6MV photon beams (400cGy) was delivered three times (fresh films inserted for each) with a Varian Clinac 600C. Image registration was performed in the Computational Environment for Radiological Research (CERR) and dose profiles and gamma analysis was performed in CERR and MATLAB.Results & DiscussionExcellent reproducibility was observed during the irradiations, with∼ 2.3% standard deviation between all pixels. Using a 3%, 3mm gamma criteria, excellent dosimetric accuracy was observed, with 98.8% and 96.3% passing rates in the sagittal and axial planes, respectively.ConclusionThe preliminary results indicate that the quad-phantom can serve as a reproducible and accurate system for high resolution dosimetry in orthogonal planes and should serve as an effective verification tool for PRESAGE/optical-CT in more challenging clinical scenarios.
