离体猪肺动脉性纹理和静脉性纹理CT研究

Computed Tomography Research About the Artery and Vein of Separated Pig Lung

目的 评估CT能否区分正常离体猪肺动脉性纹理和静脉性纹理。方法 对正常成年新鲜猪肺共 3 0只(左肺 14只 ;右肺 16只。运用螺旋CT进行扫描 ,并应用三维重建MIP等技术对其动静脉性纹理分析 ,应用标本动静脉分别解剖 ,血管铸形标本制作等进行证实。结果 离体猪肺皆分左、舌、右三肺 ;左肺 :上、中、下叶均有占85 .7% ,仅有上、下叶占 14.3 % ;右肺 :上、中、下均有占 93 .75 % ,仅有上、下叶占 8.3 %。通过薄层SpiralCT扫描及MIP技术重建 ,可较好地进行分段及亚段 ;应用经Kassab等人改良的Strahler氏分级系统来评价猪肺动静脉的分级、直径大小 ,发现在CT上能分辨 6～ 7级 ,但只能测量至 4～ 5级 ;段级以上和亚段级以下至 6～ 7级动静脉走行位置和发出角度有差异。结论 螺旋CT可较好辨识至 6～ 7级离体猪肺的动脉和静脉 。

Objective To evaluate the artery and vein of the seperateded lung of pig,and analyse the value of routine CT in differentiating the arteries from veins ,and to prove the results by anatomizing,making vessel cast specimens, 3-D reconstruction techniques and so on. Method Thirty normal fresh pig lungs, GE spiral CT Hispeed/I and workstation,anatomic tools,red and blue dyestuff 100ml and so on were used. Result Pig lungs are devided into left,lingua and right lung.85.7% left lungs have three lobes coded as superior,middle and inferior; 93.75% right have the three lobes coded in the same way. Segments and subsegments can be analysed through thin thickness scanning and MIP of spiral CT;arteries and veins of separated pig lung can be resolved to order of 6-7,by Kassab improved Strahler ordering system ,but can only be measured to order 5-6; their angles of going out and going positions of those arteries and veins above segments and below subsegments were statisticly different( P <0.05). Conclusion CT can discriminate the arteries well from the veins to order 11-12 in separated pig lung which demonstrates that CT can differentiate the arterial grain and venous grain.