Caon M, Bibbo G, Pattison J, Bhat M
School of Nursing, Flinders University of South Australia, Bedford Park, South Australia.
Med Phys. 1998 Jun;25(6):1021-7. doi: 10.1118/1.598281.
Theoretical x-ray spectra calculated by four different codes for the same tube parameters are compared by calculating and measuring doses to computed tomography (CT) body and head phantoms. The effect on the 120 kV spectrum, and hence on the calculated dose, of varying the anode angle, tube voltage, and total filtration of the x-ray tube is investigated. Codes used were those of Nowotny and Höfer (XCOMP), Boone, Iles, and Tucker et al. The code based on the work of Tucker et al. produced calculated doses noticeably lower than the other codes and compared best to the measured value. The variation in calculated dose between the Tucker code and the others is of the same order as the variation introduced by uncertainties in total filtration of about 20%, in peak tube voltage of +/- 4 kV, and in change of anode angle from 7 degrees to 13 degrees.
通过计算并测量对计算机断层扫描（CT）体模和头部体模的剂量，比较了使用四种不同代码针对相同管参数计算出的理论X射线光谱。研究了改变X射线管的阳极角度、管电压和总滤过对120 kV光谱以及由此对计算剂量的影响。使用的代码有诺沃特尼和赫费尔的代码（XCOMP）、布恩、艾尔斯以及塔克等人的代码。基于塔克等人工作的代码所计算出的剂量明显低于其他代码，并且与测量值的比较最为吻合。塔克代码与其他代码之间计算剂量的差异，与总滤过约20%的不确定性、峰值管电压±4 kV的不确定性以及阳极角度从7度变为13度所引入的差异处于同一数量级。
