4层螺旋CT的VR\MPR对门静脉血管重建技术的探讨
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[摘要] 目的 探讨4层螺旋CT的VR、MPR对门静脉重建的技术。方法 收集肝脏平扫加增强扫描80例，着重对肝脏平扫CT值的研究来确定门静脉对比剂延迟时间，应用三维容积再现(VR)与多层面重组(MPR)两种重建技术门静脉重建技术的研究。结果 VR和MPR重建图能清晰显示病变位置、范围，血管和周围邻近关系及侵犯情况，使病变情况观察更直观。平扫肝脏CT值越低，门静脉扫描延迟时间越长，正常CT值组45s时门静脉成像效果一级图像高达80%，偏低CT值组50s时门静脉成像效果一级图像达60%。结论 门静脉延迟时间的掌握，对比剂总量和流速的测量，都是CTP高质量图像的重要环节；大多数患者延迟时间45-50s可获得较理想成像效果，更好为的VR、MPR等后处理技术提供保证，为临床提供更多直观、准确的有关门静脉的信息。
[关键词] 体层摄影术，X线计算机； 门静脉； 延迟时间； 容积再现； 多平面重组
[中图分类号] R657.3+4[文献标识码] A[文章编号] 1005-0515(2011)-05-001-01
[Abstract] Objective To evaluate the reconstruction techniques of VR, MPR for the portal vein. with 4 silces spiral CT.Method Eighty patients were performed a 4 slices spiral CT together with enhancement. Portal vein and their branches were constructed by volume rendering(VR) and multiple planar reformation(MPR) techniques.The delay time of the portal vein were evaluated with the CT value of the hepatic parenchyma on pre-contrast image. Result Portal vein branch could be revealed by VR and MIP technique clearly，which could directly demonstrate the location and the extent of the lesion，and show the relationship and invasion with surrounding structure. The lower CT value of the hepatic parenchyma, the longer of delay time of the portal vein.If the CT value (of hepatic parenchyma of pre-contract) was normal, the delay time of portal vein was 40s, and the display rate of one-level image were up to 80%. The delay time (50s) was longer and the display rate of one-level image (60%) was lower when the CT value decreased. ConclusionTo get high quality images, the delay time of portal vein controlling, contrast agent volume and flow rate measurements are all the important parts of CT portography(CTP)and the recommended delay time of portal vein was 40s to 45s. Also the reconstruction techniques ; the VR, MPR ect, could directly and exactly show the information about the portal vein for clinical.
[Keywords] Tomography, X-ray computed; portal vein; delay time; volume rendering (VR); multiple planar reformation(MPR)
血管成像在多层螺旋CT的应用中是常用的技术之一，其对门静脉解剖及病变的诊断价值已得到肯定[1]，尤其在肝癌和肝移植及其他一些肝脏手术前，准确而直观地显示肝内外门静脉和肝静脉是术前设计必不可少的[2]。门静脉的特殊供血体系、心功能的正常与否，在进行CT门静脉血管成像(CT port ography, CTP) 时对比剂达到门静脉的时间较难统一、浓度不均 ......
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