目的 通过CT血管造影(CTA)和磁共振血管成像(MRA)原始图像分别构建腹盆腔血管数字化三维模型,用三维模型评估CTA及MRA对腹盆腔血管显示的差异.方法 采集25例健康青年女性的CTA及MRA原始数据集,利用三维重建软件(Mimics 10.01)分别构建腹盆腔动静脉血管的三维模型,观察两类模型中腹主动脉、下腔静脉、髂总动静脉、髂内外动静脉、子宫动脉、闭孔动静脉、臀上下动脉及其分支、阴部内动脉、骶正中动静脉、卵巢动静脉、骶前静脉丛的重建情况.并用卡方检验统计分析两类模型中上述血管显示率是否有差异.结果 两种方法对于腹主动脉、下腔静脉、髂总动静脉、髂内外动静脉、臀上下动脉、子宫动脉几乎均能达到100％显示,CTA模型对于左右闭孔动静脉的显示率分别为92 9、80％、44％、32％;MRA模型则分别是84％、72％、36％、44％,二者显示差异无统计学意义(P=0.382、P=0.508、P=0.564、P=0.382).对于骶前静脉丛,包括骶1横静脉、骶2横静脉、骶3横静脉、骶4横静脉,25例CTA模型的显示率分别是4％、8％、0％、4％;而MRA模型的显示率分别是76％、92％、96％、44％,二者差异具有统计学意义(P＜0.01、P＜0.01、P＜0.01、P=0.01).结论 基于三维模型的观察,MRA对于腹盆腔四级血管的显示率与CTA差异无统计学意义,且MRA对于骶前血管网的显示优于CTA.%Objective To construct the digitalized 3 dimensional(3D)model by using the CTA and MRA original images and to assess the differences in the pelvic and abdominal vessel display between CTA and MRA.Methods The original data set in 25 healthy youth female cases of CTA and MRA were collected.The datasets,reconstructed the 3D models of arteries and venous on 3D reconstruction software Mimics10.0 was used to construct the 3D model of pevic and abdominal vessels.The reconstruction situation of abdominal aorta,inferior vena cava,common iliac artery and common iliac venous,internal and external iliac artery and iliac venous,uterine artery,obturator artery and obturator venous,hip artery and its branches,internal pudendal artery,middle sacral artery and venous,ovarian artery and venous and sacral venous plexus were observed.Moreover the chi-square test was used to analyze whether the above vessel display rate having differences between the two kinds of model.Results The abdominal aorta,inferior vena cava,common iliac artery and common iliac venous,internal and external iliac artery and iliac venous and uterine artery almost reached 100 ％ display.The display rates of CTA model for right and left obturator artery and venous were 92 ％,80 ％,44 ％ and 32 ％ respectively,while which of MRA model were 84 ％,72 ％,36 ％ and 4％ respectively,the difference was not statistically significant(P =0.382,P=0.508,P =0.564,P =0.382).The sacral venous plexus,including S1,2,3,4 transverse vein,the display rates in 25 cases of CTA 3D models were 4％,8％,0％and 4％respective,while which of MRA models were 76％,92％,96％and 44％respectively,the differences between them were statistically significant(P＜0.01,P＜0.01,P＜0.01,P=0.01).Conclusion Based on the observation of 3D models,the displaying rate of grade 4 pelvic and abdominal vessels has no statistical difference between MRA imaging technology and currently widely used CTA technology,moreover the MRA technology is superior to the CTA technology in presacral vessel net display.
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