多层螺旋CT评价右膈下动脉起源的初步应用

Origin of right inferior phrenic artery on multislice spiral CT:preliminary application

目的 评价多层螺旋CT显示右膈下动脉 (RIPA)起源的能力。方法 MSCT行上腹部增强扫描 2 6例 ,对比剂80～ 90ml,流率 3ml/s ,重建层厚 1.2 5mm ,重建间隔 0 .6mm ,将数据传至工作站行MPR、MIP及VR处理。结果 回顾性薄层重建图像显示RIPA起源 2 2例 ,4例无法显示。后处理方法中 ,MIP能最佳显示RIPA的大体解剖学形态 ,MPR及VR显示能力不足。结论 MSCT回顾性薄层重组图像可以评价RIPA起源 ,MIP可以大体观察其解剖学形态 ,两者结合 ,能更好地为血管造影术前提供有价值的解剖学信息。

Objective To evaluate the ability of multislice spiral CT (MSCT) in showing the origin of right inferior phrenic artery (RIPA). Methods Twenty six patients were performed enhanced MSCT of upper abdomen, the volume of contrast agent was 80-90 ml, injection rate 3 ml/s, reformatted slice thickness 1.25 mm, reformatted slice increment 0.6 mm. The data were transferred to the workstation and postprocessed with maximum intensity projection (MIP), multiple planar reformatting (MPR) and volume rendering (VR). Results On the retrospective thin slice reformatting images, the origin of RIPA showed in 22 patients, 4 cases failed to show. Of all postprocessing modes, MIP was the best method to show the main anatomy of RIPA, MPR and VR had no capability enough to indicate RIPA. Conclusion Retrospective thin slice reformatting images of MSCT can evaluate the origin of RIPA. MIP can demonstrate the main anatomy of RIPA. A combination of MSCT and MIP may provide valuable anatomical information for angiography.