双能量CT线性融合技术在胰周血管成像中的应用:最佳权重因子的选择

发布时间：2018-02-12 12:43

本文关键词： 胰腺胰周血管血管成像双能量CT 线性融合技术权重因子　出处：《放射学实践》2017年08期 　论文类型：期刊论文

【摘要】：目的:在双能量CT胰腺成像中采用线性融合技术进行图像重建,比较不同权重因子(M)重建图像上胰周血管的显示情况,以提高胰腺CT成像质量。方法:对38例怀疑胰腺占位的患者行双能量CT增强扫描(80kVp/Sn140kVp),采用11种权重因子(M=0~1.0,以0.1为单位递增)对动脉晚期图像进行线性融合重建。测量并比较11组图像上腹主动脉、腹腔干、肝总动脉、脾动脉、胃十二指肠动脉和肠系膜上动脉的CT值、信噪比(SNR)和对比噪声比(CNR),并由两位放射科医师对图像质量进行主观评价。结果:各支血管的SNR及CNR在11组图像间的总体差异具有统计学意义(P0.001)。M=0.7组中的SNR最高,仅与M=0.8组间的差异无统计学意义(P0.05)。M=0.8组中的CNR最高,仅与M=0.7组间的差异无统计学意义(P0.05)。主观评价结果显示权重因子0.7组的图像质量最佳。结论:双能量CT胰腺增强扫描中,使用动脉晚期图像进行线性融合重建时权重因子值为0.7时胰周血管成像质量最佳。
[Abstract]:Objective: to compare the display of peripancreatic vessels in dual-energy CT pancreatic imaging using linear fusion technique. In order to improve the quality of CT imaging of pancreas, 38 patients suspected of pancreatic occupation were examined with dual-energy CT enhanced CT scan of 80kVp / Sn140kVpP, and 11 weighting factors (M0. 0 1.0, 0. 1 as unit increments) were used to perform linear fusion reconstruction of late arterial images. The abdominal aorta was measured and compared in 11 groups. Ct values of celiac trunk, common hepatic artery, splenic artery, gastroduodenal artery and superior mesenteric artery, The image quality was evaluated by two radiologists. Results: the overall difference of SNR and CNR among the 11 groups was statistically significant. There was no significant difference between the two groups (P 0.05, P 0. 05, P 0. 05, P 0. 8, P 0. 05). The subjective evaluation showed that the weight factor 0. 7 group had the best image quality. Conclusion: in the dual energy CT pancreatic enhancement scan, there is no significant difference between the two groups (P 0. 05), but there is no significant difference between the two groups (P 0. 05). When the weighted factor value is 0.7, the imaging quality of peripancreatic vessels is the best when the late arterial images are used for linear fusion reconstruction.
【作者单位】：北京大学第一医院医学影像科;
【分类号】：R576;R816.5

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