依据BMI值减少冠状动脉CTA辐射剂量

摘要

Objective To study how to reduce the radiation dose of coronary computed tomography angiogra-phy (CCTA) by iDOS3 technique according to the body mass index (BMI). Methods A total of 289 patients with sus-pected coronary heart disease who underwent CCTA in our hospital from October to December 2013 were selected. They were divided into three groups according to the different BMI value:group A (BMI<25, 168 cases), group B (2530, 16 cases). The radiation doses were reduced by 30%, 40%and 50%. Retrospective ECG gating and iDOS3 technology were used. The image quality of the three groups was compared. Results The aver-age score of image quality in group A, group B and group C were (3.80±0.47), (3.69±0.51) and (3.37±0.62) respectively. The difference was statistically significant (F=0.61, P=0.858>0.05). Conclusion The image quality of different groups is decreased under the condition of reducing the radiation dose, but all images meet the diagnostic requirements. There-fore, different scanning conditions can be adopted for patients with different BMI values, which can achieve the aim of keeping the image quality and reducing the radiation dose.%目的：探讨如何依据不同体质量指数(BMI)并使用iDOS3技术来减少256层螺旋CT冠状动脉血管成像(CCTA)的辐射剂量。方法对我院2013年10~12月289例怀疑冠心病患者行CCTA检查，按不同BMI值分为三组，其中BMI<25者168例(A组)；2530者16例(C组)。每组患者分别降低辐射剂量的30%(方案1)、40%(方案2)及50%(方案3)进行扫描。采用回顾性心电门控+iDOS3技术。对不同组图像质量进行比较。结果 A组、B组及C组的图像质量的平均评分分别为(3.80±0.47)分、(3.69±0.51)分和(3.37±0.62)分，三组间比较差异无统计学意义(F=0.61，P=0.858>0.05)。结论在降低不同百分比辐射剂量条件下的冠状动脉血管成像中，不同BMI患者的图像质量虽然均有所降低，但均符合诊断要求。因此，对不同BMI值人群可采取不同的扫描条件，可达到既使图像质量符合诊断要求，又减少患者辐射剂量的目的。