多排螺旋CT胰周血管成像技术的研究

目的:探讨多排螺旋电子计算机体层扫描(MSCT)胰周血管成像的扫描技术和成像方法。方法:40例无胰腺及胰周疾病的患者随机分2组:①A组准直器1.00mm,1.25mm重建;②B组准直器2.50mm,3.00mm重建。非离子型造影剂(Omnipaque300mgI/ml)按1.5ml/kg计算,注射速率3ml/s,通过造影剂跟踪技术来确定动脉期延迟时间,取T11腹主动脉为靶血管,阈值设为180～200Hu,门脉期延迟65～70s。将动脉期图像进行容积显示法(VR)和最大密度投影法(MIP)成像,统计正常腹腔动脉及其分支的显示率,并进行χ2检验。结果:腹腔干、肠系膜上动脉的显示率均为100%,胃十二指肠动脉的显示率为100%(A组)和90%(B组),P>0.05;胰十二指肠上动脉的显示率为95%(A组)和20%(B组),两组差异有显著性(P<0.05)。结论:造影剂按1.5ml/kg计算,注射速率3ml/s,准直器1.00mm,1.25mm重建,VR和MIP成像能获得良好的胰周血管图像。

Study on the Technique of MSCT Angiography for Peripancreatic Vessels

Objective: To study the scan technique and methods of multi-slic e helical computed tomography (MSCT) angiography for peripancreatic vessels. Metho ds: Forty patients without pancreatic and peripancreatic diseases were randomly divided into two groups. Group A used collimation 1.00 mm and reconstruction sli ce 1.25 mm, and Group B used collimation 2.50 mm and reconstruction slice 3.00 m m. The contrast agent (Omnipaque 300 mg I/ml) 1.5 ml/kg was injected to both gro ups and the injection rate was 3 ml/s. The arterial phase delay time was determi ned by Bolus Tracking technique, abdominal aorta (T11 level) was regarded as the target vessel and the threshold value was set at 180-200 Hu.The portal venous phase was delayed for 65-70 s.The images of arterial phase were reconstructed b y Volume Rendering(VR)and Maximum Intensity Projection(MIP), and the display rat e of abdominal artery and its branches was counted. Results: The display rate of celiac artery, superior mesenteric artery were both 100%, and the gastroduoden al artery were 100%in the group A and 90%in the group B (P >0.05), anterior su perior pancreaticodudenal artery(ASPDA) were 95%in the group A and 20%in the g roup B (P< 0.05). Conclusion: Using contrast agent 1.5 ml/kg, injection rate 3 m l/s, collimation 1 mm and reconstruction slice 1.25 mm, the VR and MIP can get a better image of peripancreatic vessels.