双能量CT非线性融合技术对胰腺占位显示的初步研究

发布时间：2018-03-05 01:19

本文选题：双能量CT　切入点：线性融合　出处：《临床放射学杂志》2017年08期 　论文类型：期刊论文

【摘要】：目的探讨双能量CT非线性融合技术对胰腺占位显示的情况及最优重组参数。方法回顾性分析32例胰腺占位患者的双能量CT(80 k Vp/Sn140 k Vp)增强扫描图像。将胰腺实质期图像数据进行不同方式的非线性融合重组,融合中心(BC)为胰腺占位与胰腺正常实质CT值的平均值,融合宽度(BW)分别设置为0、50 HU、100HU、200 HU、500 HU,最终得到5组非线性融合图像。以常规线性融合(M=0.3)的图像为参考,比较各组非线性融合图像中病灶的对比度和对比噪声比(CNR),并进行主观评价。结果所有非线性融合图像质量均高于参考图像。实性占位BW=50 HU、囊性占位BW=0时CNR值最高(P0.001),主观评价结果示读片者倾向对实性占位选择BW=0~100 HU重建图像,对囊性占位选择BW=0~200 HU重建图像。结论非线性融合技术显示胰腺占位优于常规线性融合图像,推荐使用较窄的融合宽度(BW=0~100 HU)进行重建。
[Abstract]:Objective to investigate the display of pancreatic mass by dual energy CT nonlinear fusion technique and the optimal recombination parameters. Methods dual energy CT(80 k Vp/Sn140 k Vp images of 32 patients with pancreatic mass were analyzed retrospectively. Image data are fused and reorganized in different ways, The fusion center (BCC) was the average value of CT value of pancreatic mass and normal pancreatic parenchyma, and the fusion width was set to 0 ~ (50) HUT ~ (100) HUT ~ (200) HUC _ (500 HUU) respectively. Finally, five groups of nonlinear fusion images were obtained. The contrast and contrast noise ratio of lesions in each group of nonlinear fusion images were compared and evaluated subjectively. Results the quality of all nonlinear fusion images was higher than that of reference image. The CNR value of solid occupying BW=50 HUW was the highest at 0:00. The subjective evaluation results showed that the readers tended to choose BW=0~100 Hu images for real occupation. Conclusion the nonlinear fusion technique is superior to the conventional linear fusion image, and a narrower fusion width is recommended for reconstruction.
【作者单位】：北京大学第一医院医学影像科;
【分类号】：R735.9;R816.5

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