应用CT轴位扫描降低腰椎间盘病变放射辐射剂量的研究

Applications with axial scanning of CT to reduce radiation dose in lumbar intervertebral disc diseases

目的探讨CT轴位扫描应用于腰椎间盘扫描以降低辐射剂量的可行性及其临床应用价值。方法随机抽取正常BMI的60例志愿者行CT腰椎间盘检查,在其他参数均相同情况下分别进行常规剂量(270 mA)和低剂量(180 mA、135 mA)扫描,比较两种不同低剂量CT扫描所得图像与常规剂量的图像质量差异,以及发现椎间盘病变的差异。结果在扫描图像质量方面,两种不同低剂量与常规剂量扫描有统计学差异(P<0.05)。但在诊断疾病方面,两种不同低剂量扫描与常规剂量扫描无统计学差异(P>0.05)。在满足诊断需要的同时,患者接受的辐射剂量分别降低36.5%及54.0%。结论轴位扫描应用于腰椎间盘CT扫描具有一定的可行性,并可大幅度降低患者辐射剂量。

Objective To discuss the clinical significance and the possibilities of low dose CT scanning with axial CT technology in lumbar intervertebral disc. Methods The sample was randomly selected of 60 volunteers from healthy body mass index （BMI） in patients with lumbar intervertebral disc diseases, with the other scanning parameters kept unchanged for all the cases in each group, were examined by MSCT respectively in standard dose （270 mA） and different low-dose （180 mA, 135 mA）. Then, a comparison was made to evaluate the differences in image quality and detection of the lesion between the low-dose CT scanning and the standard dose CT scanning. Results The imaging was evaluated by the image quality score, there was statistical difference between the low-dose CT scanning and the standard dose CT scanning （P〈0.05）. However, there was not statistical difference in detection of the lesion between the low-dose CT scanning and the standard dose CT scanning （/〉〉0.05）, which did not influence doctor to view and make diagnosis.Comparing to 270 mA as the standard, the dose length product （DLP） of 180 mA and 135 mA was decreased by 36.5% and 54.0% respectively. Conclusion Low-dose CT scanning with axial technology in lumbar intervertebral disc is practicable and the radiation dose can be greatly reduced.