胸部低剂量CT扫描在AIDS合并PCP体质量低者中的应用价值

Application value of low-dose chest CT scans in AIDS patients complicated with low PCP body mass

目的探讨低剂量CT扫描在AIDS合并PCP体质量低者中的应用可行性及临床价值。方法将69例AIDS合并PCP体质量低患者,随机分成3组,分别采用管电压固定为120kV,常规剂量(自动mAs)与低剂量扫描,低剂量扫描管电流分别采用40mAs,30mAs,20mAs,对图像质量、辐射剂量进行分析,得出AIDS合并PCP体质量低患者的最优低剂量扫描方案。结果常规剂量扫描与低剂量扫描获得图像均能达到影像诊断要求。采用管电压固定为120kV,管电流为常规剂量、40 mAs、30 mAs、20 mAs组获得的平均辐射剂量CTDIvol分别为:6.65mGy、2.06 mGy、1.54 mGy、1.03 mGy,管电流20 mAs组最低,为常规剂量的15.5%。结论采用管电压kV值固定为120kV,管电流20mAs胸部低剂量CT扫描在AIDS合并PCP体质量低患者中图像质量能满足临床诊断要求,同时降低辐射剂量,值得推广。

Objective To investigate the application feasibility and clinical value of low-dose CT scans in＆amp;nbsp;AIDS patients comp-licated with low PCP body mass. Methods 69 AIDS patients with low PCP body mass were ran-domly divided into 3 groups and scanned respectively with a tube voltage fixed at 120kV, conventional dose （automat-ic mAs） and low-dose, with the low-dose scanning tube current being 40mAs, 30mAs and 20mAs respectively. The image quality and radiation dose were analyzed in order to gain the optimal low dose scanning solution in AIDS pa-tients complicated with low PCP body mass. Results The images obtained by both conventional dose scanning and low-dose scanning could meet the requirements of imaging diagnosis. The average radiation CTDIvol obtained in the group using the fixed tube voltage 120kV, with a tube current of the conventional dose, 40 mAs, 30 mAs and 20 mAs was respectively：6. 65mGy, 2. 06 mGy, 1. 54 mGy and 1. 03 mGy, with the group using tube current 20 mAs being the lowest, 15. 5% of the group using conventional dose. Conclusion The image quality of low-dose chest CT scans using a tube voltage value fixed at 120kV and a tube current 20mAs in AIDS patients combined with low PCP body mass can meet the requirements of clinical diagnosis, and at the same time, it can reduce the radiation dose.