下腔静脉血流速度对合理选择布-加综合征CT静脉成像延迟时间的参考价值

Blood flow velocity in IVC for optimization of the scanning delay time in CT venography of Budd-Chiari syndrome

目的探讨多普勒超声所测下腔静脉血流速度对合理选择布-加综合征(BCS)CT静脉成像(CTV)延迟时间的参考价值。方法40例DSA证实的BCS患者,介入治疗前1周内均以多普勒超声测量下腔静脉血流速度值。CTV延迟时间设定为120s、180s、240s、300s,直至获取到满意的原始图像。将最佳延迟时间与下腔静脉血流速度值进行对照分析。结果40例BCS下腔静脉血流速度为(3.02±6.87)cm/s,其中血流速度≤5cm/s者6例,CTV最佳延迟时间均为300s;血流速度>5且≤10cm/s者22例,CTV最佳延迟时间均为240s;血流速度>10且≤15cm/s者11例,其中CTV最佳延迟时间180s者8例,240s者3例;血流速度>15cm/s者1例,CTV最佳延迟时间120s。结论多普勒超声所测下腔静脉血流速度对BCSCTV延迟时间的合理选择具有较高的参考价值。

Objective To evaluate the adjunctive value of blood flow velocity in inferior vene cava （IVC） for optimization of the scanning delay time in CT venography （CTV） of Budd Chiari syndrome （BCS）. Methods Blood flow velocity of 40 BCS patients were measured in IVC with Doppler ultrasonography before interventional therapy. The scanning delay time of CTV presented 120 s, 180 s, 240 s and 300 s until the ideal images appeared. The optimal scanning delay time and the blood flow velocity in IVC were analyzed. Results The blood flow velocity in IVC of 40 patients with BCS was （3.02 ＋＋ 6.87）cm/s. When the blood flow velocity in IVC was ≤5 cm/s, between 5 cm/s and 10 cm/s, between 10 cm/s and ≤15 cm/s, 〉15 cm/s, the optimal scanning delay time was 300 s, 240 s, 180 s and 240 s, 120 s, respectively. The optimal scanning delay time of CTV appeared much later while the blood flow velocity in IVC was slower. Conclusion The blood flow velocity in IVC is adjunctively valuable for optimization of the scanning delay time in CTV of BCS.