新双源CT冠脉成像的不同心电采集模式的人体X线吸收剂量及应用价值

目的:研究新双源CT冠脉成像的3种不同心电采集模式的人体X线吸收剂量及价值。方法:2012年3月～2012年6月CT冠脉成像的患者共362例,根据心率分为三组,A组161例为节律规整,心率≤75次/min,B组126例为节律规整,心率>75次/min的患者,C组75例为心律不齐,早搏≥5次/min,心率>75次/min的患者,三组患者根据心率分别采取三种扫描模式(Flash Cardio SAFIRE)扫描模式即高螺距低剂量螺旋扫描模式;DS_CoronaryCTA_AdaptSeq扫描模式即前瞻性ECG触发三维序列扫描模式;DS_CoronaryCTA_SAFIRE扫描模式即回顾性ECG门控并通过SAFIRE减少剂量的螺旋扫描模式)进行扫描,所有患者检查前均未使用心率控制药物,观察三组患者X线吸收剂量:结果:41例因呼吸运动图像出现错列,确定为成像失败,其中A组失败7例(7/161),B组失败22例(22/126),C组失败14例(14/75);失败率为11.33%,符合诊断要求的321例(321/362),占88.67%。比较三种不同心电采集模式的人体X线吸收剂量,A组DLP为(53±19)mGry.cm,ED为(0.601±0.361)mSv,B组DLP为(241±81)mGry.cm,ED为(1.252±0.802)mSv;X线吸收剂量大大低于C组。组间比较差异具有显著性,有统计学意义P<0.05。结论:Flash_Cardio_SAFIRE扫描模式和DS_Coronar-yCTA_AdaptSeq扫描模式的X线吸收剂量大大低于DS_CoronaryCTA_SAFIRE扫描模式,并且可同样获得有价值的冠脉成像。

X-ray absorption dosage of new dual-source CT coronary imaging of three kinds of ecg acquisition model and its application value

Objective:To explore the X-ray absorption dosage of new dual-source CT coronary imaging of three kinds of ecg acquisition model and its application value.Methods:A total of 362 patients that underwent coronary CT imaging during March 2012-June 2012 were enrolled and divided into 3 groups,of which group A were patients with regular rhythm,heart beat rates were less than 75 / min(n=161 cases),group B were patients with regular rhythm,heart beat rates were more than 75 / min(n=126 cases),group C were patients with irregular rhythm,heart beat rates were more than 75 / min(n=126 cases),premature heart beat rates were more than 5 / min(n=126 cases).The three groups underwent Flash_Cardio_SAFIRE mode;DS_CoronaryCTA_AdaptSeq mode;DS_CoronaryCTA_SAFIRE mode of CT coronary imaging,respectively.All patients were given drugs to control heart beats,and X-ray absorption dosage were observed and compared.Results:Imaging failure occurred in 41 cases due to breathing,of which 7 patients were from group A(7/161),22 from group B(22/126),and 14 cases from group C(14/75).Failure rate was 11.33%.For 321 cases,image quality met the requirements for diagnosis(321/362,88.67%).Human body X-ray absorption dosage was DLP(53 ± 19) mGry.cm and ED(0.601 + /-0.361) mSv for group A;DLP(241 + 81) mGry.Cm,ED(1.252 + /-0.802 mSv for group B;X-ray absorption dosage were both significant lower than that of group C(P<0.05).Conclusion:X-ray absorption dosage of Flash_Cardio_SAFIRE scanning mode and DS_CoronaryCTA_AdaptSeq scanning mode is much lower than that of the DS_CoronaryCTA_SAFIRE scanning mode,but the coronary images quality were helpful for diagnosis.