摘要
目的探讨低剂量双源CT冠状动脉成像技术在高体质量指数（BMI）患者中应用的必要性与可行性。方法选取BMI≥28kg／m2、心率65～90次／min患者60例，按随机数字表法分为采用前瞻性心电门控扫描和回顾性心电门控扫描，各30例，比较两组影像的图像质量、CT剂量加权指数（CTDI）和剂量长度积（DLP）。结果回顾性心电门控扫描患者冠状动脉图像质量评分为（3．47±0．61）分，前瞻性心电门控扫描患者为（3．18±0．94）分，两者比较差异无统计学意义（P〉0．05）。前瞻性心电门控扫描患者CTDI和DLP明显低于回顾性心电门控扫描患者[（32．44±10．18）mGy比（45．86±15．34）mGy和（458．00±95．27）mGy／cm比（532．15-．I-154．43）mGy／cm]，差异有统计学意义（P〈0．05）。结论对于高BMI患者，采用不同的双源CT低剂量扫描程序，尤其是前瞻性心电门控扫描，可以在保证成像质量的同时，有效减低受检者的辐射剂量，减少辐射损伤。
Objective To evaluate the necessity and feasibility of low-dose dual-source CT coronary angiography imaging in the evaluation of high body mass index （BMI） patients. Methods Sixty patients with BMI ≥ 28 kg/m^2 and heart rate 65 - 90 beats/min were selected, and they were divided into prospective electrocardiography gated scanning group and retrospective electrocardiography gated scanning group by random digits table method with 30 cases each. The image quality, CT dose weighing index （CTDI） and dose length product （DLP） were compared between 2 groups. Results There was no statistical difference in the score of coronary image quality between retrospective electrocardiography gated scanning group and prospective electrocardiography gated scanning group： （3.47 ± 0.61） scores vs. （3.18 ± 0.94） scores, P 〉 0.05. The CTDI and DLP in prospective electrocardiography gated scanning were significantly lower than those that in retrospective electrocardiography gated scanning： （32.44± 10.18） mGy vs. （45.86 ± 15.34） mGy and （458.00± 95.27） mGy/cm vs. （532.15 ± 154.43） mGy/cm, and there were statistical differences （P 〈 0.05）. Conclusion For high BMI patients, different low-dose dual-source CT scanning, especially prospective electrocardiography gated scanning, can guarantee image quality and reduce the radiation dose and the radiation damage at the same time.
出处
《中国医师进修杂志》
2015年第10期740-742,共3页
Chinese Journal of Postgraduates of Medicine
基金
新疆医科大学科研创新基金（XJC2012134）
