肺动脉血栓CT值的测量对于诊断及鉴别急性肺栓塞的意义

Attenuation of emboli in diagnosis and differentiation of acute and chronic pulmonary embolism

目的探讨多层螺旋CT扫描在诊断和鉴别急性肺栓塞时,肺动脉血栓CT值的测量是否具有临床意义.方法回顾性分析我院2004年1月-2005年10月期间临床诊断急、慢性肺栓塞患者56例（全部患者均有完整的临床、实验室及影像资料）.其中女23例,男33例.平均年龄（62.9±15.3）岁.CT扫描机为GE 16层螺旋CT,1.25 mm探测器.由两位放射科医师采用盲法阅读CT图像,评价血栓形态,并对血栓的CT值进行测量.结果 56例肺栓塞中急性37例,慢性19例.急性血栓CT值为15.9～70 Hu,平均值（36.35±17.61） Hu;慢性肺栓塞肺动脉血栓CT值为33～169 Hu,平均值为（71.94±37.95） Hu.两者存在显著性差异（P=0.004）.结论对肺动脉血栓CT值进行测量,可以帮助诊断急性肺栓塞.

Objective To evaluate the attenuation of emboli in acute and chronic＂pulmonary embolism （PE）. Methods Fifty-six patients with acute and chronic PE from Jan 2004 to Oct 2005, who have complete data （clinic, laboratory and CT pulmonary angiography）, including 23 women and 33 men （mean age, [62.9±15. 3] years; range, 24- 88 years）. Images were acquired with a 16-slice CT scanner and 1. 25 mm collimation. Two readers made independent attenuation measurements of the largest thrombus in each patient at a workstation. Results Thirty-seven patients were acute PE, and the other 19 were chronic PE. The mean attenuation for both readers was 36.3 Hu for acute PE, and 71.9 Hu for chronic PE （P= 0. 004）. Conehlsion The mean attenuation measurement in chronic PE is significantly higher than in acute PE.