低剂量迭代重建对肝脏CT增强扫描图像质量的影响

发布时间：2018-07-25 11:37

【摘要】：目的探讨低剂量迭代重建对肝脏CT增强扫描图像质量的影响。方法选择疑似肝肿瘤或肝肿瘤复查者84例,根据入院顺序分为低剂量组和常规剂量组各42例。两组均采用西门子64排128层螺旋CT机行肝脏CT增强扫描检查,低剂量组与常规剂量组管电压分别为80、120 k V,采用迭代重建技术重建门静脉数据。比较两组有效辐射剂量、图像质量客观评价指标[肝CT值、噪声、信噪比(SNR)、对比噪声比(CNR)]及图像质量主管评价指标(分辨率评分、图像失真评分、诊断信心评分)。结果低剂量组、常规剂量组有效辐射剂量分别为(4.23±0.27)、(7.64±0.67)m Sv,P0.05。低剂量组肝CT值、SNR、CNR均高于常规剂量组,P均0.05;两组噪声比较,P0.05。低剂量组分辨率评分低于常规剂量组,P0.05。两组图像失真评分、诊断信心评分比较,P均0.05。结论低剂量迭代重建的有效辐射剂量少,对肝脏CT增强扫描图像质量的影响较小。
[Abstract]:Objective to investigate the effect of low dose iterative reconstruction on the quality of liver CT enhanced scanning. Methods 84 patients with suspected liver tumor or liver tumor were selected and divided into low dose group (42 cases) and routine dose group (42 cases) according to the order of admission. Both groups were examined by Siemens 64-slice 128-slice spiral CT. The tube voltages of low dose group and conventional dose group were 80120 kV respectively. The portal vein data were reconstructed by iterative reconstruction technique. The effective radiation dose, objective evaluation index of image quality [liver CT value, noise, SNR (SNR), contrast noise ratio (CNR)] and image quality supervisor evaluation index (resolution score, image distortion score, diagnostic confidence score) were compared between the two groups. Results the effective radiation doses of low dose group and routine dose group were (4.23 卤0.27), (7.64 卤0.67) MV P 0.05, respectively. The liver CT value of the low dose group was higher than that of the normal dose group (P 0.05), and the noise of the two groups was higher than that of the control group (P 0.05). The resolution score of low dose group was lower than that of routine dose group (P 0.05). The comparison of image distortion score and diagnostic confidence score between the two groups (P < 0.05). Conclusion the effective radiation dose of low dose iterative reconstruction is less, and the effect on the quality of liver enhanced CT scan image is small.
【作者单位】：无锡市第五人民医院;
【分类号】：R816.5

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