MDCT肺动脉成像:不同注射速率对周围肺动脉显示的影响  

MDCT Angiography of the Pulmonary Arteries :Influence of Different Flow Rate of Iodioneon Vessel Attenuation and Visualization

作　　者：张皓[1] 韩铭钧[1] 章作铨[1] 王颖[1] 秦培鑫[1] 刘小彬[1] 何燕丽[1] 钟国梅[1] 

机构地区：[1]中山大学附属第五医院放射科,广东珠海519000

出　　处：《实用放射学杂志》2007年第6期824-827,共4页Journal of Practical Radiology

摘　　要：目的探讨不同对比剂注射速率对外周肺动脉显示的差异,从而提高对外周肺动脉的显示率。方法40例胸部CT增强扫描的患者随机分为2组(每组各20例),分别以3ml/s和5ml/s的速率注入90ml对比剂(300mgI/ml),测量肺动脉亚段水平的CT值,并采用记分法评分5、6级肺动脉的显示情况。结果2组4级肺动脉显示良好,在4级肺动脉的平均CT值分别为(262.15±56.86)HU和(350.29±85.74)HU,二者相差88HU且有统计学意义(t=17.537,P<0.05);A、B2组5级肺动脉显示平均积分分别为15.98±6.93,17.18±7.45(Z=-2.672,P=0.024<0.05),6级肺动脉显示平均积分分别为21.73±9.78,25.93±11.92(Z=-2.974,P=0.003<0.05)且有统计学意义。结论增大对比剂注射速率将显著提高外周肺动脉的密度,同时有助于4级及其以下肺动脉更好地显示,可为研究外周肺动脉本身及相关疾病引发肺动脉改变提供较清晰的影像学资料。Objective To assess the influence of different iodione injected flow rate on attenuation and visualization of the pulmonary arteries in thoracic MDCT angiography. Methods Forty cases undergone thoracic enhanced CT scan were randomly divided into two groups （20 cases in each ） , the injecting flow rate was 3ml/s （ group A ） and 5 ml/s （ group B ） respectively,and 90 ml contrast medium （300 mg I/ml ） was used. The CT values of subsegmental pulmonary arteries were measured. The visualization of fifth - and sixth - order arteries were assessed by score. Results The mean enhancement of the fourth - order arteries along the Z - axis was （262.15 ± 56.86 ） HU in group A and （350.29 ± 85.74 ） HU in group B. The difference of 88 HU was statistically significant （ P 〈 0.05 ）. The detection score of fifth - and sixth - order arteries was 15.98 ± 6.93 （ group A ） , 17.18 ± 7.45 （ group B ） and 21.73 ± 9.78 （ group A ） , 25.93 ± 11.92 （ group B ） respectively. There were significantly higher in group B than in group A （ P 〈 0. 05 ） . Conclusion Using a high flow injected rate of iodine in MDCT angiography of the pulmonary arteries can significantly increase attenuation of the pulmonary arteries, thereby improving visualization of subsegmental and lower pulmonary arteries.

关 键 词：对比剂 血管造影术 肺动脉 体层摄影术 X线计算机 

分 类 号：R814.43[医药卫生—影像医学与核医学] R322.1[医药卫生—放射医学]