MinDose技术在CT急性胸痛三联排查中的应用  

Application of MinDose technique in triple-rule-out CT angiography (TRO-CTA) in patients with acute chest pain

作　　者：王敏[1] 郭美玲[1] 李剑[1] 

机构地区：[1]山东省济宁市第一人民医院CT室,山东济宁272111

出　　处：《中国中西医结合影像学杂志》2014年第2期142-143,146,共3页Chinese Imaging Journal of Integrated Traditional and Western Medicine

摘　　要：目的：探讨MinDose技术对急性胸痛三联排查（triple-rule-out，TRO）图像质量和辐射剂量的影响。方法：50例临床症状表现为急性胸痛并行128层CT回顾性心电门控 TRO的患者，随机分为A组（常规组）、B组（MinDose组），每组25例。A、B组管电流调节技术窗均采用30％～70％的RR间期，A组窗外曝光剂量为全剂量的20％，B组应用MinDose技术，窗外曝光剂量为全剂量的4％。其余扫描参数相同。分析2组图像质量，记录剂量长度乘积，比较有效剂量。采用 t检验比较2组的图像质量和辐射剂量。结果：A、B组图像质量评分分别为（3.06±0.40）分、（2.91±0.44）分，差异无统计学意义（ P＞0.05）。B组辐射剂量为（6.47±1.03）mSv ，明显低于 A组的（7.25±1.43）mSv ，差异有统计学意义（P＜0.05）。结论：Min-Dose技术可以在保证图像质量的前提下，降低患者的辐射剂量，在TRO低剂量扫描中具有重要价值。Objective：To explore the value of MinDose technique in triple-rule-out CT angiography （TRO-CTA） in patients who were with acute chest pain .Methods ：Fifty patients with acute chest pain were randomly assigned to two different retrospectively ECG-gated TRO-CTA protocols ：group A （regular group ,n=25） with the tube current reduced to 20% of the normal tube cur-rent outside the pulsing window and group B （low-dose group ,n=25） with the tube current reduced to 4% of the normal tube current outside the pulsing window （MinDose） .Subjective image quality was assessed by two observers in consensus using a four-point scale .Vascular attenuation of aorta and pulmonary artery were analyzed .Estimation of effective dose （ED） was per-formed on the basis of dose length product （DLP） .Image quality and radiation dose were compared with t-test between the two groups .Results：Subjective image quality was rated similar in both groups （3 .06 ± 0 .40 vs .2 .91 ± 0 .44 ,P〉0 .05） .The effective dose of group A was significantly lower than group B （（6 .47 ± 1 .03）mSv vs .（7 .25 ± 1 .43）mSv ,P〈0 .05） .Conclusions ：MinD-ose technique in TRO-CTA can provide diagnostic image quality at reduced radiation dose in patients with chest pain .

关 键 词：体层摄影术  X线计算机 胸痛 辐射剂量 

分 类 号：R816.4[医药卫生—放射医学]