Benchmarking the DACS-integrated Radiation Dose Monitor® skin dose mapping software using XR-RV3 Gafchromic® films
Benchmarking the DACS-integrated Radiation Dose Monitor® skin dose mapping software using XR-RV3 Gafchromic® films
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DOI：
10.1002/mp.13125
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发表时间：
2018-10-01
期刊：
影响因子：
3.8
通讯作者：
Farah, Jad
中科院分区：
文献类型：
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作者：
Geryes, Bouchra Habib;Hadid-Beurrier, Lama;Farah, Jad
目的：利用Gafchromic（(R)）薄膜对新型dacs集成患者皮肤剂量测量溶液进行基准测试。材料和方法使用辐射剂量监测器（RDM, Medsquare）以1厘米(2)分辨率计算患者皮肤累积剂量分布，使用辐射剂量结构化报告（RDSR），表示背散射和质量能量吸收系数，以及特定地点对表、床垫衰减和空气度校准因子的校正。考虑到两种广泛使用的x射线设备，将RDM计算的峰值皮肤剂量（PSD）和二维皮肤剂量分布与XR-RV3 Gafchromic（(R)）胶片的幻象测量结果进行比较。17种不同的设置，包括简单和多光束投射，极端角度（高达75度），所有可用的视场（fov 48-11cm），额外的准直，可变工作台高度和横向位置，以及可变幻影厚度（12,20和30cm）。结果利用临床光束质量对膜进行了仔细校准，总体测量不确定度达到22.8% （k=2）。在西门子Artis Zee和GEMS Innova IGS介入系统上进行的34种测试条件下，计算和测量的PSD值的平均差异分别为10% - 7%和9%+/- 7%。最后，考虑到1厘米(2)分辨率，RDM的2D皮肤剂量图与XR-RV3胶片上记录的剂量图密切匹配。虽然RDM由于可变的管投影、视场、工作台位置等因素可以正确地再现光束重叠，但RDSR中矩形视场转换为方形区域以及大管投影（>45度）可见的阶梯效应方面的挑战很少。结论考虑到与Gafchromic（(R)）膜相关的测量不确定度，RDM的dacs集成皮肤剂量测量软件的准确性是可以接受的。
PurposeTo perform a benchmark of a new DACS-integrated patient skin dose mapping solution using on-phantom measurements with Gafchromic((R)) films.Materials and methodsTo calculate cumulative patient skin dose distribution with 1-cm(2) resolution, a Radiation Dose Monitor (RDM, Medsquare), using the Radiation Dose Structured Report (RDSR), tabulated backscatter and mass energy absorption coefficients together with site-specific corrections for table, mattress attenuation, and air kerma calibration factor. Peak skin dose (PSD) and two-dimensional (2D) skin dose distributions calculated with RDM were compared against on-phantom measurements with XR-RV3 Gafchromic((R)) films considering two widely used x-ray equipment. Seventeen different settings which include simple and multiple beam projections with extreme angulations (up to 75 degrees), all available fields-of-view (FOVs 48-11cm), additional collimation, variable table height and lateral positions, and variable phantom thickness (12, 20, and 30cm) were involved.ResultsDue to a careful calibration of films using clinical beam qualities, 22.8% (k=2) overall measurement uncertainty was achieved. Calculated and measured PSD values agreed with an average difference of 10%7% and 9%+/- 7% for 34 test conditions performed on Siemens Artis Zee and GEMS Innova IGS interventional systems, respectively. Finally, RDM's 2D skin dose maps closely matched those registered on XR-RV3 films considering the 1-cm(2) resolution. While RDM correctly reproduced beam overlapping due to variable tube projections, FOV, table positions, etc., few challenges were identified related to conversion of rectangular fields to square areas in the RDSR and a stair-step effect visible for large tube projections (>45 degrees).ConclusionThe accuracy of RDM's DACS-integrated skin dose mapping software was acceptable considering measurement uncertainties associated with Gafchromic((R)) films.