能谱CT双低剂量高清共轭采集在冠状动脉狭窄诊断中的价值

发布时间：2018-03-25 13:37

本文选题：体层摄影术　切入点：X线计算机　出处：《放射学实践》2015年10期

【摘要】：目的:探讨能谱CT使用低管电压和低浓度对比剂结合高清共轭采集技术对冠状动脉CTA检查的图像质量和辐射剂量的影响。方法:选择临床拟诊冠心病及支架术后行冠状动脉CTA复查的患者152例,随机分成A、B两组,各76例。A组:使用管电压100kVp,对比剂浓度270mg I/mL,128层40mm的高清(HD)共轭容积数据采集。B组:使用管电压120kVp,对比剂浓度为320mg I/mL,采用128层40mm的标准(STD)共轭容积数据采集。两组其它扫描参数不变。对两组图像质量进行评分,并记录和计算图像主动脉根部对比噪声比(CNR)、冠状动脉各段CT值的均值及冠状动脉显示节段数,计算两组的辐射剂量(ED)和人均碘摄入量,对两组间上述指标进行统计学分析。结果:A、B组图像质量评分分别为(3.52±0.48)和(3.12±0.56)分,且差异具有统计学意义(t=5.01,P0.05);A组图像CNR高于B组(t=4.18,P0.05);两组冠状动脉各段CT值均无统计学差异(P均0.05),均可满足诊断需求;A组冠状动脉可评价节段数为1064,B组为1032;A、B组的ED值分别为(2.72±0.58)和(3.59±0.62)mSv,差异有统计学意义(t=9.66,P0.05);A组人均碘摄入量[(234.42±10.23)mg I/kg]低于B组[(294.32±12.07)mg I/kg,t=33.09,P0.001]。结论:能谱CT冠状动脉成像中,使用100kVp和低浓度等渗对比剂结合高清共轭采集技术,可有效降低辐射剂量,减少人体碘摄入量,同时提高整体图像质量,对冠状动脉狭窄病变的诊断提供了一定的帮助。
[Abstract]:Objective: to investigate the effect of low tube voltage and low concentration contrast medium combined with high definition conjugate acquisition technique on the image quality and radiation dose of coronary artery CTA by EDS. Methods: clinical prospective coronary heart disease and stent operation were selected. 152 patients underwent coronary CTA reexamination, They were randomly divided into two groups: group A and group B. 76 cases. Group A: conjugate volume data acquisition with tube voltage 100kVpand contrast agent concentration 270mg I / mLL128-layer 40mm. Group B: using tube voltage 120kVp, contrast agent concentration 320mg I / mL, using 128-layer 40mm standard / std conjugate volume data acquisition. Other scanning parameters remained unchanged. The quality of the two groups of images was evaluated, The noise ratio of aortic root contrast, the mean CT value of coronary artery and the number of displayed segments of coronary artery were recorded and calculated. The radiation dose (EDN) and iodine intake per capita were calculated. Results the image quality scores of the two groups were 3.52 卤0.48 and 3.12 卤0.56, respectively. The difference was statistically significant (P < 0.05). The CNR of group A was higher than that of group B (4.18%), and there was no significant difference in CT values between the two groups (P < 0.05), which could meet the diagnostic needs. The number of coronary artery segments in group A was 1064% and the number of segments in group B was 1032AB. There was significant difference in iodine intake per capita between group A (2.72 卤0.58) and group A (3.59 卤0.62mSv.Conclusion: the intake of iodine per capita in group A [234.42 卤10.23)mg I/kg] was significantly lower than that in group B [294.32 卤12.07)mg I / kg / kg P 0.001]. The use of 100kVp and low-concentration isosmotic contrast agent combined with high-definition conjugate acquisition technology can effectively reduce the radiation dose, reduce the intake of iodine, improve the overall image quality, and provide some help for the diagnosis of coronary artery stenosis.
【作者单位】：大连市中心医院放射线科;
【分类号】：R541.4;R816.2

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