螺旋CT的临床应用

Study of Spiral CT in Clinical Application

探讨螺旋ＣＴ在临床应用价值。选择部分典型病例３０例，其中血管性病变或累及血管的病变８例，骨病变２１例，胆道病变１例。扫描机为ＰｈｉｌｉｐａＴｏｍｏｓｃａｎＡｖｅｐ。血管成像为主的，选择２—５ｍｍ的准直器宽度和床速，１２ｍｍ间隔重建，其它病变选择５—７ｍｍ的准直器宽度和床速，２—３ｍｍ间隔重建，增强扫描使用６０％的碘造影剂８０—１２０ｍｌ，以肘静脑用高压注射器注入，速率３ｍｌ／ｓ，脑血管和腹腔大血管延迟１５２５秒扫描，门脉成像延迟７０秒。结果：１０例以ＭＩＰ方作了ＣＴＡ，２９例用ＳＳＤ进行了三维重建（３－Ｄ），２９例作了ＭＰＲ，结论：ＭＩＰ可观察兴趣区血管的全程及分枝，能分辨强化的管腔与管壁的动脉硬化钙斑，可以选择不同时相进行血管成像，还可进行胆道造影的ＭＩＰ成像。ＳＳＤ可直观病变与周围结构的立体关系，可以任意旋转选择最佳视角观察。ＭＰＲ可以从冠矢状位或任意斜位观察，了解病变各方面的关系。

Purpose: To evaluate the value of spiral CT in clinical application, Materials and methods:30 typical cases were selected, which include vascular or involved vascular lesions in 8 cases ,bone lesions in 21,and biliary tract lesion in 1,Scanner was Philips Tomoscan AVEL,2——5mm collimation and table feed,2—3mm reconstruction increment were chosen for vascula rmaging and 5—7mm collimation and table feed ,23 mm reconstruction increment for bone imaging.with enhancementscan, 60% iodinated contrast medium was injected by high pressure injector though cubital vein, flow rate eas 3ml/second with 15—20s delay for cerebral vessels and abdominal large vessels and 70s foe portal veins,Result:CTA were performed by MIP methods in 10 cases ,three dimensional reconstruction by SSD in 29 and MPR in 29, Conclusion: the vascular course and its branches were showed by MIP which could differentiate enhanced lumen from atherosclerosis calcification and choose varied phase for vessel imaging, Cholangiogram could be smade by MIP also,The lesions and their 3-D relations with surrounding structure could be demonstrated by SSD method though any viewpoint, Coronal or sagittal or any oblique view could be performed by MRP for understanding every related part of the lesion.