多层螺旋CT在胸部扫描中减少辐射剂量的技术探讨  

The Exploration of Radiation Dosage Control in the Chest Multi-slice CT Scan

作　　者：陈波[1] 王海军[1] 

机构地区：[1]解放军总医院西院放射科,北京100839

出　　处：《中国医学影像学杂志》2009年第2期95-97,共3页Chinese Journal of Medical Imaging

摘　　要：目的:探讨多层螺旋CT在胸部扫描过程中调整了扫描的参数减少患者的辐射剂量。材料和方法:将120例胸部多层面CT检查患者随机分为对照组及实验组2组,对照组63例,实验组57例。CT扫描采用GElightspeedQX/I多层螺旋CT机,对照组扫描参数为管球电压120kV,电流300mA;实验组扫描参数为管球电压120kV,电流30～50mA,并分别测量两组患者所接受的辐射剂量。结果:实验组与对照组CT图像质量无显著差异,均达到诊断要求。对照组与实验组CT剂量加权指数(CTDI)平均值分别为9.8mGy,1.1mGy,实验组辐射剂量低于对照组(P<0.05)。结论:采用低剂量扫描技术可减少对患者的照射剂量,且能达到诊断要求。Purpose： To investigate the feasibility of reducing the radiation dose by adjusting the scan parameter in chest multi-slice CT examination. Materials and Methods： Randomly grouped 120 patients into control group and experimental group. The control group was consist of 63 cases, the scan parameter was 120 kV and 300 mA; the experimental group was consist of 57 cases, the scan parameter was 120 kV and 30-50 mA. Results： The image equality of the tow groups was of no significant difference, both reached the diagnostic stand-ard. The mean CT dose indexes of control group and experimental group were 9.8mGy and 1.1mGy respectively. The dose of experimental group was lower than that of control group （ P 〈 0.05 ）. Conclusion： Low-dose chest CT scan provides diagnostically acceptable images with relevant diagnostic information, and the patients get the best radiation protection as well.

关 键 词：多层螺旋CT 扫描剂量 辐射防护 

分 类 号：R814.3[医药卫生—影像医学与核医学]