前门控低kV收缩末期采集联合迭代重建技术在高心率超体质量患者冠状动脉成像中的应用价值

发布时间：2018-07-05 08:36

本文选题：冠心病 + 体层摄影术　；参考：《中华实用诊断与治疗杂志》2016年01期

【摘要】：目的探讨高心率超体质量患者行冠状动脉CT血管造影时应用前门控低kV收缩末期采集联合迭代重建(sinogram affirmed iterative reconstruction,SAFIRE)技术对图像质量和辐射剂量的影响。方法行冠状动脉CT血管造影80例高心率超体质量患者,随机分为观察组和对照组各40例,2组均采用前瞻性心电门控触发序列进行扫描,观察组应用前门控100kV联合收缩末期35%~50%的R-R时间窗采集加SAFIRE重建;对照组应用前门控120kV联合30%~80%的R-R时间窗采集加常规滤过反投影(filtered back projection,FBP)重建。测量2组噪声,计算信噪比,记录剂量长度乘积(dose length product,DLP),计算有效辐射剂量,比较2组图像质量。结果 80例患者1 164个冠状动脉节段中1 151个节段(98.88%)的图像质量可满足诊断要求,其中观察组578个节段中图像质量优+良好者549段(94.98%),对照组586个节段中图像质量优+良好者559段(95.39%),二者优良率比较差异无统计学意义(P0.05);观察组有效辐射剂量[(2.76±0.43)mSv]低于对照组[(7.68±0.86)mSv](P0.05),信噪比(21.69±5.65)、噪声[(24.51±6.46)Hu]、图像质量评分[(3.48±0.32)分]与对照组[信噪比(19.54±4.46)、噪声(22.35±5.27)Hu、图像质量评分(3.50±0.57)分]比较差异无统计学意义(P0.05)。结论高心率超体质量患者行冠状动脉CT血管造影时应用前门控100kV收缩末期采集联合SAFIRE技术可获得临床满意图像,并可降低辐射剂量。
[Abstract]:Objective to investigate the effect of (sinogram affirmed iterative reconstruction and SAFIRE technique on image quality and radiation dose in patients with high heart rate superbody mass (HHR) undergoing coronary artery CT angiography (CAA). Methods 80 patients with high heart rate superbody mass were randomly divided into observation group and control group, 40 patients in each group were scanned by prospective electrocardiogram trigger sequence. In the observation group, 50% of R-R time window acquisition and SAFIRE reconstruction were used in the front door control 100kV combined with 35% of the late systolic phase, while in the control group, the former 120 kV plus 30% R-R time window acquisition and conventional filter backprojection (filtered back project were used to reconstruct the control group. Two groups of noise were measured, signal-to-noise ratio (SNR) was calculated, dose length product (dose length product DLP) was recorded, effective radiation dose was calculated, and the quality of two groups of images was compared. Results the image quality of 11151 segments (98.88%) of 11 164 coronary artery segments in 80 patients could meet the diagnostic requirements. There were 549 segments (94.98%) with good image quality in 578 segments in the observation group and 559 segments (95.39%) in the 586 segments in the control group. There was no significant difference in the excellent and good rate between the two groups (P0.05), and the effective radiation dose [(2.76 卤0.43) mSv] in the observation group was lower than that in the control group (95.39%), and the effective radiation dose in the observation group [(2.76 卤0.43) mSv] was lower than that in the control group. There was no significant difference between the control group [(7.68 卤0.86) mSv] (P0.05), SNR (21.69 卤5.65), noise (24.51 卤6.46) Hu, image quality score (3.48 卤0.32) and control group [SNR (19.54 卤4.46), noise (22.35 卤5.27) Hu, image quality score (3.50 卤0.57)] (P0.05). Conclusion in patients with high heart rate superbody mass coronary artery CT angiography combined with SAFIRE can obtain satisfactory clinical images and reduce the radiation dose.
【作者单位】：新疆医科大学第一附属医院影像中心;
【基金】：新疆乌鲁木齐市科学技术计划项目(Y121320019)
【分类号】：R816.2;R541.4

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