宝石能谱CT低电压联合自适应性统计迭代重建在腹部扫描中的应用

发布时间：2018-05-01 17:27

本文选题：低电压 + 迭代重建　；参考：《山东医药》2015年35期

【摘要】：目的观察宝石能谱CT低电压联合自适应性统计迭代重建在腹部扫描中的应用价值及对图像质量的影响。方法 200例行上腹部增强检查的患者随机分为A、B两组各100例,A组采用低电压(100 k V),并进行自适应性统计迭代重建40%重建。B组采用常规电压(120 k V),并进行滤波反投影(FBP)重建;另根据BMI(23、23~28、28)将每组分为3个亚组(A组分为A1、A2、A3组,B组分为B1、B2、B3组)。记录各亚组剂量报告中CT剂量容积指数(CTDIvol)及剂量长度乘积(DLP),并计算有效剂量(ED);测量腹主动脉、门静脉血管腔内的CT值,并计算以上血管的信号噪声比(SNR)和对比噪声比(CNR);从肠系膜动脉的清晰度、门脉分支的清晰度、图像整体质量、主观噪声评分四个方面对图像进行主观评价。结果与B2组比较,A2组CTDIvol、DLP、ED减小(P均0.05);与B3组比较,CTDIvol、DLP、ED减小(P均0.05)。与B1组比较,A1组主动脉CT值、门静脉CT值、门静脉CNR增大(P均0.05);与B2组比较,A2组主动脉CT值、主动脉CNR、门静脉CT值增大(P均0.05);与B3组比较,主动脉CT值、门静脉CT值增大(P均0.05)。A1、B1组肠系膜血管清晰度、门静脉分支的清晰度、图像整体质量、主观噪声评分比较,P均0.05,其各自相应秩和检验量为486、475、502.5、370.75;A2、B2组肠系膜血管清晰度、门静脉分支的清晰度、图像整体质量、主观噪声评分比较,P均0.05,其各自相应秩和检验量为1 316、1 316、1 385.5、1 223;A3、B3组肠系膜血管清晰度、门静脉分支的清晰度、图像整体质量、主观噪声评分比较,P均0.05,其各自相应秩和检验量为140、130、161、118。结论低电压腹部扫描能明显降低辐射剂量,提高血管内碘浓度,结合自适应性统计迭代重建,可以降低图像噪声,改善图像质量,满足临床诊断要求。
[Abstract]:Objective to observe the application value of low voltage combined adaptive statistical iterative reconstruction of gemstone energy dispersive CT in abdominal scanning and its effect on image quality. Methods 200 patients with epigastric enhancement were randomly divided into two groups: group A (n = 100) and group A (n = 100). In addition, each group was divided into three subgroups: group A, group A, group A, group A, group A, group A, group A, group B, group B, group B, group B, group B, group B, group B, group B, group B, group B, group B, group B, group B, group B, group B, group B, group The CT dose volume index (CTDIvoll) and dose length product (DLPN) were recorded in each subgroup dose report, and the effective dose EDV was calculated, and the CT values of abdominal aorta and portal vein were measured. The signal noise ratio (SNR) and contrast noise ratio (CNR) of the above vessels were calculated, and the image was evaluated subjectively from four aspects: the definition of mesenteric artery, the clarity of portal branch, the overall image quality, and the subjective noise score. Results compared with group B2, the Ed of CTDIvolo DLPnD in group A _ 2 decreased by 0.05 and that in group B _ 3 decreased by 0.05. Compared with group B1, CT value of aorta, CT value of portal vein and CNR of portal vein were 0.05 in group A1, 0.05 in group A 2, 0.05 in group A and 0.05 in group B 2, respectively, and in group B 3, CT value of aorta was higher than that in group B 3, the CT value of aorta in group A 2 was higher than that in group B 2, and the CT value in group B 2 was higher than that in group B 2. Portal CT increased mesenteric vascular clarity, resolution of portal vein branches, overall image quality, subjective noise score (P < 0.05), and the corresponding rank sum test was 486475502.5n370.75A _ 2 / B _ 2 in group B _ 2 of mesenteric blood vessel clarity, and the results showed that the resolution of mesenteric vessels in group B _ 2 was significantly higher than that in group B _ 2 (P < 0.05). The definition, overall image quality and subjective noise score of portal vein branches were all 0.05. The corresponding rank sum test of portal vein branches was 1 316 / 1 3165 / 1 223A 3 / B 3 group respectively, and the definition of portal vein branches and the overall image quality of each group were compared. The scores of subjective noise were 0.05, and the corresponding rank sum test was 1401301 161118. Conclusion low voltage abdominal scan can significantly reduce radiation dose, increase intravascular iodine concentration, combined with adaptive statistical iterative reconstruction, can reduce image noise, improve image quality, and meet the requirements of clinical diagnosis.
【作者单位】：鄂尔多斯市中心医院;
【分类号】：R816.5

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