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目的 对离体猪肺血管铸型标本进行测量 ,计算其 1～ 5级血管的上 /下级和同级血管静脉 /动脉的相对比值 ,以评估使用CT测量、计算相对比值的价值。方法 CT扫描灌注铸型药液的 4个标本 ,在铸型标本制成后 ,分别选取血管主干 /左肺后叶 /下段至 5级动脉和静脉 ,测量其径值并计算上 /下级血管和同级静脉 /动脉的相对比值。对CT测量和计算的相对比值和铸型标本上测量和计算的相对比值进行统计学比较。结果 同级静脉 /动脉相对比值中 2级与CT扫描计算的相对比值有差异 (P <0 .0 5 ) ,在 3～ 5级无差异 (P >0 .0 5 ) ;上下级动脉和静脉相对比值均无差异 (P >0 .0 5 )。结论 CT对血管的上 /下级相对比值评估具有较高价值。
OBJECTIVE: To measure the relative ratio of the superior / inferior vessels of the first to fifth vessels and the venous / arterial vessels of the same grade in vitro to evaluate the value of using the CT measurement to calculate the relative ratio. Methods CT scanning was used to perfuse four specimens of the cast medicinal solution. After the cast specimens were made, the main artery, the posterior lobe of the left lung, the fifth artery and vein were selected, the diameters were measured, and the upper / lower vessels and The same ratio of venous / arterial relative. The relative ratio between CT measurement and calculation and the relative ratio measured and calculated on the mold specimens were statistically compared. Results There was a significant difference between the two groups (P <0.05) in the relative venous / arterial ratio at the same level (P <0.05), with no difference at the third to fifth level (P> 0.05) There was no significant difference in relative ratio (P> 0.05). Conclusion CT has a high value in assessing the relative ratio of upper and lower vessels.