依据BMI值减少冠状动脉CTA辐射剂量

Reducing the radiation dose in coronary CT angiography according to body mass index of the patients

目的探讨如何依据不同体质量指数(BMI)并使用i DOS3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);25<BMI<30者105例(B组);BMI>30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+i DOS3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。

Objective To study how to reduce the radiation dose of coronary computed tomography angiography（CCTA） by iDOS3 technique according to the body mass index（BMI）.Methods A total of 289 patients with suspected 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（25〈BMI〈 30,105 cases）,group C（BMI〉30,16 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 average 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.Therefore,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.