MSCT肺动脉成像不同参数对周围肺动脉显示率的对比研究

发布时间：2018-06-03 12:54

本文选题：肺动脉 + 体层摄影术　；参考：《兰州大学》2012年硕士论文

【摘要】：研究目的： 1、探讨MSCT肺动脉成像不同注射速率和对比剂浓度对周围肺动脉显示率的对比研究。 2、探讨MSCT肺动脉成像不同准直宽度对周围肺动脉显示率的对比研究。材料与方法：收集我院2011年2月至2011年10月行胸部增强扫描,排除肺肿瘤、肺结核、肺部手术史、肺部感染及支气管扩张、肺栓塞、严重肺心病及肺动脉高压、严重心衰及肺血管畸形患者。增强扫描采用Bolus-tracking技术,感兴趣区(ROI)均位于主动脉-主肺动脉层面肺动脉干腔中间,触发阈值设为100HU,延时3s开始监测,达到阂值后启动扫描,从肺尖至肺底扫描。扫描条件120kv,80mAs。对比剂总量50ml,按照不同对比剂浓度和注射速率分组：A组为350mgI/ml,3ml/s：B组350mgI/ml,5ml/s；C组300mgI/ml,3ml/s；D组300mgI/ml,5ml/s；按照不同准直宽度分组：D组0.6mm,E组1.5mm(300mgI/ml,5ml/s)；A、B、C、D组重建层厚0.75mm,E组重建层厚1.5mm。统计学分析不同组肺动脉干、左右肺动脉及4级肺动脉CT值和5、6肺动脉显示率。结果：最终纳入本研究患者100例；男性68例,女性32例。A、B、C、D组肺动脉干、左右肺动脉及4级肺动脉CT值比较有差异(P0.05),且4级肺动脉平均CT值比较B组值均大于其余三组；D组与E组比较无差异(P0.05)；五组4级肺动脉分支显示数目无统计学意义(P=0.19)；五组5级肺动脉显示率下叶区有统计学差异(P0.05)；6级肺动脉显示率每个叶区均有统计学差异(P0.05);D组与E组比较5级肺动脉显示率无统计学意义(P=O.78),6级肺动脉显示率有差异(P=0.00)。结论： 1、采用浓度350mgI/ml,注射速率5ml/s可以显著提高周围肺血管显示率； 2、采用较薄准直0.6mm可以提高5、6级肺动脉显示率
[Abstract]:Objectives of the study: 1. To investigate the contrast study of MSCT pulmonary artery imaging with different injection rate and concentration of contrast medium on peripheral pulmonary artery. 2. To investigate the contrast study of MSCT pulmonary artery imaging with different collimation width on peripheral pulmonary artery. Materials and methods: From February 2011 to October 2011, we performed chest enhanced scanning to exclude lung tumor, pulmonary tuberculosis, history of pulmonary surgery, pulmonary infection and bronchiectasis, pulmonary embolism, severe pulmonary heart disease and pulmonary hypertension, severe heart failure and pulmonary vascular malformation. Contrast-enhanced scanning was performed with Bolus-tracking technique. The region of interest (ROI) was located between aorta and pulmonary artery, and the trigger threshold was set to 100HU. the delay of 3s was monitored, and then the scan was started from the top of the lung to the bottom of the lung. The scanning condition was 120kvn 80 mAs. The total amount of contrast agent was 50 ml. According to the concentration of contrast agent and injection rate, we divided into two groups: group A: 350 mg / ml / 3ml / s: B: group B: 350mgIml / ml / s / B group: group C: group C 300mg / ml / s group: group C: 300mg / ml / d group: group C: 300mgIml / ml / 5ml / s; The CT value of pulmonary trunk, left and right pulmonary arteries and 4 grade pulmonary artery and the display rate of 5 ~ 6 pulmonary artery were analyzed statistically. Results: Finally, 100 patients were included in this study, including 68 males and 32 females. The CT values of left and right pulmonary arteries were significantly higher than those of grade 4 pulmonary arteries, and the mean CT values of grade 4 pulmonary arteries in group B were higher than those in group E (P 0.05), and there was no significant difference between group D and group E in the number of pulmonary artery branches of grade 4. There was significant difference in the display rate of the lower lobe area between the five groups. There was no significant difference in the display rate of the grade 5 pulmonary artery between the D group and the E group. There was no significant difference in the display rate of the grade 5 pulmonary artery between group D and group E (P 0.005). Conclusion: 1. The injection rate of 5ml/s at concentration 350 mg I / ml could significantly increase the peripheral pulmonary vascular display rate. 2Then using thin-collimated 0.6mm can improve the display rate of 5 ~ 6 grade pulmonary artery.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R816.41

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