MSCT Study On Anatomy And Angiography Of Collateral Vessels Of Hepatic Segment Of Inferior Vena Cava

Objective:measure and statistical analysis the parameters of the hepatic vein in multi-layer spiral CT angiography, and evaluate the three-dimensional reconstruction value of Collateral Vessels of Hepatic segment of Inferior vena cava. Methods:In this study, we collect 100 qualified patients, according to the inclusion criteria, received full abdominal enhanced scan with GE light speed VCT, post-processing including multi-planer reformation(MPR), maximum intensity projection(MIP), volume rendering(VR) were done in order to assess the hepatic vein and short hepatic vein, observation liver vein points type, the number of short hepatic vein, inferior right hepatic veins, measure the maximum inner diameter and length of hepatic vein, the extrahepatic length of inferior right hepatic veins,then statistical analysis. Results: Part I: anatomical characteristics of the collateral vessels of hepatic segment of Inferior vena cava.Right hepatic vein diameter at a mean of(9.23 ± 3.01) mm, hepatic vein diameter at a mean of(7.84 ± 2.06) mm, left hepatic vein diameter at a mean of(7.46 ± 1.63) mm. The angle of Right-Middle hepatic vein(52.04 ± 9.74 °), The angle of Left-Middle hepatic vein(59.08 ± 18.12 °). Hepatic vein into the inferior vena way, the present study 100 cases can be divided into: type I, alone right hepatic vein into the inferior vena cava, the left hepatic vein and middle hepatic vein common trunk, 57%(57/100), the common trunk length(13.4 ± 5.2) mm, the common trunk diameter(12.9 ± 4.0) mm; type II, 3 hepatic vein into the inferior vena cava separately, 42%(42/100). Hepatic vein type: A type accounted for 52%(52/100); B type accounted for 31%(31/100); C type accounted for 17%(17/100). Right Posterosuperior Vein accounted for 14.0%(12/86), pipe diameter(3.52 ± 1.21) mm; Middle Right Hepatic Vein accounted for 11.6%(10/86); Inferior Right Hepatic Vein accounted for 74.4%(64/86). Caudate lobe veins was 89%, which left type 66, right. type 29. Part II: The correlation between hepatic vein and Inferior Right Hepatic Vein.1.the relationships of Inferior Right Hepatic Vein(IRHV)diameter and number : the diameter and number of IRHV showed negative correlation(r s=﹣0.43; P=0.03), the greater number of IRHV, the smaller diameter.2. the relationship between IRHV and hepatic vein diameter(RHV): IRHV diameter and the diameter of RHV was negatively correlated(r s=﹣0.217, P=0.039), the larger the diameter of RHV, the smaller diameter of IRHV; IRHV positively correlated with the number of RHV was diameter,(r s=0.413, P <0.01) larger both RHV diameter, the greater the number of IRHV.3. There is no correlation between IRHV and LHV, MHV.Part III: Assessment of the three-dimensional reconstruction effect for the hepatic vein.100 patients were investigator for VR and MIP display capabilities of short hepatic veins, found that the two methods was significantly different for the short hepatic vein of diameter<3mm, however the short hepatic veins of 3mm≤diameter<5mm and diameter≥5mm showed no statistical difference. Conclusion:Variation of the hepatic vein is large, a larger number of short hepatic veins, shape and distribution of individual differences, the use of abdominal MSCTA can cover more anatomy to obtain high quality images of vascular anatomy and detailed practical information for preoperative fine individual the development of anatomy and surgery observation programs provide the basis for the best results and ensure the success rate of surgery to provide a convenient, practical and effective means of imaging.