宝石CT小剂量对比剂肺动脉成像不同阈值的应用研究

发布时间：2018-02-09 09:19

本文关键词： 肺动脉体层摄影术螺旋计算机　出处：《中国临床医学影像杂志》2015年11期 　论文类型：期刊论文

【摘要】：目的:探讨利用智能触发技术在选择相同触发位置、不同阈值时小剂量对比剂肺动脉CT成像效果,以期提高肺动脉CTA图像质量。方法:72例接受肺动脉CTA患者随机平均分成A、B、C组,以主动脉弓平面上腔静脉为监测点,分别以50、80、110 HU作为监测阈值进行智能触发扫描,比较肺动脉主干、亚段肺动脉、静脉、主动脉强化CT值及亚段肺动脉与肺静脉强化CT值差值的差异,同时比较不同监测阈值图像之间的差异。结果:肺动脉主干、亚段肺动脉和肺静脉、主动脉强化CT值及亚段肺动脉与肺静脉强化CT值差值和不同监测阈值下等级图像差异在50 HU与其它2组有显著性差异(P0.05),图像质量好;80 HU和110 HU两组比较除了亚段肺动、静脉CT值的差值外,其它统计量差异无统计学意义(P0.05),图像质量较差。结论:以主动脉弓平面上腔静脉为监测点,50 HU作为触发阈值时肺动脉强化CT值最大,能获得更理想的肺动脉CTA图像。
[Abstract]:Objective: to investigate the effect of low-dose contrast medium pulmonary CT imaging with the same trigger position and different threshold in order to improve the CTA image quality of pulmonary artery. Methods: 72 patients receiving pulmonary artery CTA were randomly divided into two groups: group A (n = 72) and group C (n = 7). The superior vena cava in the plane of the aortic arch was used as the monitoring point, and the monitoring threshold of 50 ~ 80 Hu was used to perform intelligent trigger scanning to compare the main pulmonary artery, the subsegmental pulmonary artery and the vein. Ct value of aortic enhancement and difference of CT value between subsegmental pulmonary artery and pulmonary vein were compared. Results: pulmonary artery trunk, subsegmental pulmonary artery and pulmonary vein, pulmonary artery, subsegmental pulmonary artery, pulmonary vein, pulmonary artery, pulmonary artery, subsegmental pulmonary artery and pulmonary vein were compared. The CT value of aortic enhancement, the difference of CT value between subsegmental pulmonary artery and pulmonary vein, and the difference of grade images under different monitoring thresholds were significant difference between 50 Hu and the other two groups (P 0.05). The image quality of the two groups was better than that of the other two groups (80 Hu and 110 Hu), except subsegmental pulmonary movements. In addition to the difference of CT value of vein, there was no significant difference in other statistics (P 0.05), but the image quality was poor. Conclusion: the CT value of pulmonary artery enhancement is the largest when 50 Hu is used as the monitoring point in the superior vena cava in the plane of aortic arch, and the CT value of pulmonary artery enhancement is the highest when 50 Hu is used as the trigger threshold. A better CTA image of pulmonary artery can be obtained.
【作者单位】：宝鸡市人民医院CT室;
【分类号】：R816.4

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