生理盐水冲洗提高多层CT门脉造影图像质量的临床研究  

Clinical application of normal saline flush in multi-detector CT photography on portal vein

作　　者：肖亮[1] 徐克[1] 

机构地区：[1]中国医科大学附属第一医院放射科,辽宁省沈阳市110001

出　　处：《世界华人消化杂志》2005年第19期2343-2348,共6页World Chinese Journal of Digestology

摘　　要：目的:评价生理盐水冲洗技术对于改善多层螺旋CT三维门脉造影MIP图像质量的临床应用价值．方法:58例疑有肝脏转移瘤的患者,随机分为A,B 组．A组给与2．0 mL／kg对比剂及30 mL盐水冲洗;B组仅给与等量的对比剂．对比剂注射时间均为33 s,盐水的注射速度为3 mL／s．扫描延迟45 s,原始数据采用 1 mm间隔重建．测量原始横断图像中肝右叶实质、门脉右干、门脉主干以及腹主动脉增强后的CT值．采用 4分评定法评估最大密度投影法(MIP)图像质量．结果:A组的门脉主干、门脉右干的CT值以及门脉右支与肝右叶CT值的差异均较B组高,两组的差值分别为25．0,19．7,17．6 Hu(P=0．006,0．047及0．042);A组 MIP图像质量为优或者良的比例为60．7％(17／28),而B 组为33.3％(10／30),两组的3D-CTP MIP图像质量平均评分差值为0．59,差异均具有统计学意义(P=0．040)．结论:生理盐水冲洗技术可以提高门脉对比强化程度、改善MIP图像的质量．AIM： To evaluate the clinical application of normal saline flush technique in improving the three-dimensional image quality of multi-detector helical CT-photography obtained by maximum intensity projection （MIP）. METHODS： Fifty-eight patients were randomly divided into two groups. Patients in the two groups were both injected with 2.0 mL/kg contrast material （300 gl/L）, and patients in group A were also treated with 30 mL saline flush （3 mL/s）. The injection of the contrast material lasted 33 s in both groups. The scanning was performed 45 s after injection. The scanning started at the level of the diaphragm and covered the entire liver and spleen. The acquired raw data were reconstructed at an interval of 1 mm. The CT values of the right hepatic lobe （RHL）, main portal vein （MPV）, right portal vein （RPV）, and abdominal aorta were assessed. MIP images of 3D-CTP were visually graded by the four point-scoring system. RESULTS： The mean CT attenuation values of MPV, RPV, and RPV-RHL were higher in group A. The differences between the two groups were 25.0, 19.7, and 17.6 Hu （P = 0.006, 0.047, and 0.042, respectively）. The rates of the excellent or good MIP images were 60.7% （17/28） in group A, and 33.3% （10/30） in group B. The mean score of the differences was 0.59, which was significant between the two groups （P = 0.040）. CONCLUSION： The saline flush technique can increase the CT attenuation value of portal vein as well as improve the quality of its MIP images.

关 键 词：螺旋CT 三维门脉造影 生理盐水冲洗 图像质量 最大密度投影法 

分 类 号：R816.5[医药卫生—放射医学]