基于身体质量指数优化管电流降低256层螺旋CT的冠状动脉成像辐射剂量的研究  

The study of optimization of tube current based on BMI to reduce 256-slice CT coronary angiography radiation dose

作　　者：雷勇[1] 陈自谦[2] 付丽媛[3] 钱根年[3] 

机构地区：[1]南京军区福州总医院医务部,福建福州350025 [2]第二军医大学福州总院临床医学院医学影像中心,福建福州350025 [3]南京军区福州总医院医学影像中心,福建福州350025

出　　处：《东南国防医药》2014年第1期1-5,9,共6页Military Medical Journal of Southeast China

基　　金：国家自然科学基金(81271607)

摘　　要：目的探讨基于身体质量指数(BMI)优化管电流在256层螺旋极速CT冠状动脉检查降低辐射剂量中的可行性与应用价值,即常规回顾性心电门控技术与基于BMI优化管电流回顾性心电门控术的对比研究。方法按拟定的标准将120例病例纳入本研究,随机分为A、B两组,每组60例。A组:常规回顾性心电门控组(对照组);B组:基于BMI优化管电流回顾性心电门控组(实验组)。记录每例患者的性别、年龄、体重、身高、BMI、平均心率及扫描长度,测量并计算出原始轴位冠状动脉增强图像的图像噪声、信号噪声比和对比噪声比,同时进行图像质量评价,并计算出有效辐射剂量。然后对客观与主观图像质量评估指标及有效辐射剂量进行统计学分析。结果①A、B两组患者的图像噪声分别为:30.48±5.60、32.08±3.56,组间比较无显著差异(P>0.05)。A、B两组患者的图像信噪比分别为:15.42±3.73、14.47±2.72,组间比较无显著差异(P>0.05)。A、B两组患者的图像对比噪声比分别为:13.29±3.52、12.40±2.60,组间比较无显著差异(P>0.05)。A、B两组患者的图像总评分分别为:(3.63±0.41)分、(3.58±0.44)分,组间比较无显著差异(P>0.05)。②A、两组患者的有效辐射剂量分别为:(14.34±0.92)mSv、(7.16±1.40)mSv,组间比较有显著差异(P<0.05)。结论基于BMI优化管电流回顾性心电门控与常规回顾性心电门控技术相比,前者在满足诊断要求的图像质量的同时,可有效地降低辐射剂量。Objective To investigate the feasibility and application value of optimization of tube current based on BMI to reduce 256-slice CT coronary angiography radiation dose. Methods According to the exclusion criteria, 120 cases were included in the study and divided into two groups randomly. Group A ： conventional retrospective ECG-gating group （ control group ）, group B ： BMI-based optimization of tube current retrospective ECG-gating group （ experiment group）. Record the gender, age, weight, height, BMI, average heart rate and scanning length of each patient, and measurement background noise （BN）, signal noise ratio （SNR） and contrast noise ratio （CNR） in axial original coronary artery enhancement image, assessment of the image quality of coronary artery subjectively, and calculated effective dose （ED）. Then the basic information, the objective and subjective image quality assessment index and ED of the patients in the two groups were analyzed statistically. Results ① The BN of image in A and B groups were 30.48 ± 5.60 and 32. 08 ±3.56,no significant differences between the two groups （P 〉0.05）. The SNR of image in A and B groups were 15.42 ±3.73 and 14.47 ± 2.72 ,no significant differences between the two groups （P 〉 0. 05 ）. The CNR of image in A and B groups were 13.29 ± 3.52 and 12.40 ± 2.60, no significant differences between the two groups （ P 〉 0.05 ）. The total score of image in A and B groups were 3.63 ± 0.41 and 3.58 ± 0. 44, no significant differences between the two groups （ P 〉 0.05 ）. （±）The ED of patients in A and B groups were （ 14.34 ± 0.92 ） mSv and （ 7.16 ± 1.40 ） mSv, significant differences between the two groups （ P 〈 0.05 ）. Conclusion Compared conventional retrospective ECG-gating CT coronary angiography with BMI-based optimization of tube current retrospective ECG-gating CT coronary angiography, the BMI-based optimization of tube current retrospective ECG-gating CT coronary angiography can reduce ra- diation d

关 键 词：256层螺旋CT 冠状动脉成像 回顾性心电门控技术 身体质量指数 优化管电流 图像质量 辐射剂量 

分 类 号：R816.2[医药卫生—放射医学] R541.4[医药卫生—临床医学]