Fetterly K A, Gerbi B J, Alaei P, Geise R A
Department of Diagnostic Radiology, University of Minnesota, Minneapolis 55455, USA.
Med Phys. 2001 Feb;28(2):205-9. doi: 10.1118/1.1344206.
The purpose of this study was to characterize the x-ray dose distribution of fluoroscopy beams by measuring their percent depth dose curves and lateral dose profiles in a water phantom. Percent depth dose curves were measured near the surface with an Attix parallel plate chamber and deep within the water phantom with a Farmer-type cylindrical chamber. Percent depth dose curves were compared to published data where applicable. Lateral dose profiles were measured at depths of 2, 5, 10, and 15 cm in phantom with a Farmer chamber. Pulsed, 50 mA x-ray beams with peak tube potentials of 60, 80, 100, and 120 kV and half value layers of 1.89, 2.52, 3.20, and 4.09 mm Al, respectively, were investigated.
本研究的目的是通过在水模体中测量透视束的百分深度剂量曲线和侧向剂量分布来表征其X射线剂量分布。使用Attix平行板电离室在水模体表面附近测量百分深度剂量曲线，使用Farmer型圆柱形电离室在水模体深处测量。适用时，将百分深度剂量曲线与已发表的数据进行比较。使用Farmer电离室在模体中2、5、10和15 cm深度处测量侧向剂量分布。研究了脉冲式50 mA X射线束，其峰值管电压分别为60、80、100和120 kV，半值层分别为1.89、2.52、3.20和4.09 mm铝。
