双能CT在增强检查中的应用:体模研究

发布时间：2018-03-02 06:12

本文关键词： 体层摄影术 X线计算机双能量对比剂体模　出处：《中国医学影像技术》2015年09期 　论文类型：期刊论文

【摘要】：目的探讨双能CT(DECT)成像技术在增强检查中的应用价值。方法将浓度不同的碘乙醇溶液和碘水溶液封装于塑料试管中,按顺序固定后浸浴在装满水的截面近似椭圆、周长为86cm的尼龙复合膜中制成体模原型。于Siemens Somatom Definition Flash扫描仪分别采用常规上腹部条件进行单能和DECT扫描。于专用图像工作站采用Liver VNC软件测量各溶液的碘浓度,并回顾性重建权重为0.5的线性混合图像、最优非线性混合图像(OCM)和CNR最大的单能量图像。结果两种溶液碘浓度测量值与理论值均呈强相关(r=0.998、0.999,P均0.001),但相对误差较大(最大值25.00%)。OCM图像和65keV单能量图像的CNR碘浓度比均显著高于120kVp图像(P0.001)。结论 DECT可准确区分不同碘溶液的浓度,应用于增强检查可提高图像质量。
[Abstract]:Objective to study the application value of dual-energy CT-DECT imaging technique in enhancement examination. Methods the different concentrations of iodoethanol solution and iodine aqueous solution were encapsulated in plastic test tube, and then fixed in sequence, then immersed in the ellipse of the section filled with water. The phantom prototype of nylon composite membrane with a circumference of 86 cm was made. The single energy and DECT scans were performed in the Siemens Somatom Definition Flash scanner under conventional upper abdominal conditions. The iodine concentration of each solution was measured by Liver VNC software in a special image workstation. And retrospective reconstruction of linear mixed images with a weight of 0.5, Results the measured values of iodine concentration of the two solutions were strongly correlated with the theoretical values, but the relative error was larger (the maximum value was 25.00%) and the CNR iodine concentration of 65keV single energy image was higher than that of the single energy image of 65keV. The degree ratio was significantly higher than that in 120kVp image (P 0.001). Conclusion DECT can accurately distinguish the concentration of different iodine solutions. Image quality can be improved when applied to enhancement check.
【作者单位】：第三军医大学生物医学工程学院;
【基金】：全军医学科技“十二五”重点课题(BWS11J015)
【分类号】：R814

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