256层螺旋CT低辐射剂量检查联合迭代重建技术在肺动脉栓塞诊断中的应用价值

Application of 256-slice spiral CT low radiation dose examination and iterative reconstruction technique in diagnosis of pulmonary embolism

目的:观察256层螺旋CT低辐射剂量检查联合迭代重建技术在肺动脉栓塞诊断中的应用价值。方法:选取80例肺动脉栓塞患者为研究对象,按随机数字表法分为对照组和观察组各40例,两组均采用256层螺旋CT检查,对照组采用常规辐射剂量(管电压120 kV)检查联合迭代重建技术,观察组采用低辐射剂量(管电压100 kV)检查联合迭代重建技术。比较两组辐射剂量[剂量长度乘积(DLP)、容积CT剂量指数(CTDIvol)]水平、肺动脉主干和肺叶的图像噪声情况[CT值、信噪比(SNR)、对比信噪比(CNR)、标准差(SD)]。结果:观察组DLP和CTDIvol水平均低于对照组,差异有统计学意义(P<0.05);两组肺动脉主干、肺叶动脉的CT值、SNR、CNR和SD水平比较,差异均无统计学意义(P>0.05)。结论:256层螺旋CT低辐射剂量检查联合迭代重建技术应用于肺动脉栓塞诊断中可在维持图像质量基础上降低辐射剂量水平,效果优于256层螺旋常规辐射剂量检查联合迭代重建技术诊断。

Objective:To observe application value of 256-slice spiral CT low radiation dose examination and iterative reconstruction technique in diagnosis of pulmonary embolism.Methods:80 patients with pulmonary embolism were selected as the research objects,and were divided into control group and observation group according to the random number table method,40 cases in each group.Both groups were examined by 256-slice spiral CT.The control group was given the conventional radiation dose(tube voltage 120 kV)examination combined with iterative reconstruction technique,while the observation group used the low radiation dose(tube voltage 100 kV)examination combined with iterative reconstruction technique.The radiation dose levels[dose-length product(DLP),CT dose index volume(CTDIvol)]and the image noise of the main pulmonary artery and lung lobes[CT value,signal-to-noise ratio(SNR),contrast-to-noise ratio(CNR),standard deviation(SD)]levels were compared between the two groups.Results:The levels of DLP and CTDIvol in the observation group were lower than those in the control group,and the differences were statistically significant(P<0.05).However,there were no significant differences in the CT value,SNR,CNR and SD levels of the main pulmonary artery and lobar artery between the two groups(P>0.05).Conclusions:256-slice spiral CT low-radiation dose examination combined with iterative reconstruction technique in the diagnosis of pulmonary embolism can reduce the radiation dose level on the basis of maintaining the image quality.Moreover,it is superior to 256-slice spiral conventional radiation dose examination combined with iterative reconstruction technique diagnosis.