M. Mkimel , M.R. Mesradi , R. El Baydaoui , Y. Toufique , Z. Aitelcadi , A. El Kharrim , A. Hilali
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引用次数: 6
摘要
CT检查时的吸收剂量可以通过计算机断层扫描剂量指数(CTDI)来估计。本研究的目的是用16层CT系统的测量数据验证模拟CTDI。为了测量CTDI，我们使用了一个离子室，静电计和两个聚甲基丙烯酸甲酯(PMMA)模型(头部和身体)。GATE (GEANT4 Application for tomography Emission)平台是一个用于医学物理应用，特别是剂量学研究的蒙特卡罗代码。记录CTDI和CTDIw，将不同x射线管电流和电压下的模拟结果与幻体不同位置的实验数据进行比较。在所有条件下获得的结果表明，头部和身体幻觉的差异分别小于2.6%和4.3%。结果表明，GATE是模拟CTDIw值和研究管电流和电压对吸收剂量影响的良好工具。
Assessment of computed tomography dose index (CTDI) using the platform GEANT4/GATE
Absorbed dose during a CT exam can be estimated by the computed tomography dose index (CTDI). The aim of this study is to validate a simulated CTDI with measured data for a 16-slice CT system. To measure the CTDI we have used an ion chamber, electrometer and two polymethylmethacrylate (PMMA) phantoms (head and body). GATE (GEANT4 Application for Tomographic Emission) platform is a Monte Carlo code for medical physics applications, especially dosimetry studies. CTDI and CTDIw were recorded to compare simulated results for different X-ray tube currents and voltages with experimental data at different positions in the phantom. The results obtained for all conditions applied show a difference less than 2.6% and 4.3% for head and body phantom, respectively. It was demonstrated that GATE is a good tool to simulate CTDIw values and to study of the influence of tube current and voltage on the absorbed dose.
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