256层CT冠状动脉成像技术因素和辐射剂量的对比研究  

Comparison study of coronary angiography techniques and radiation exposure dose with 256-slice spiral CT.

作　　者：李长清[1] 袁利[1] 王振平[1] 陈旺生[1] 余宁[1] 俞安伦[1] 

机构地区：[1]海南省人民医院放射科,海南海口570311

出　　处：《海南医学》2013年第11期1614-1616,共3页Hainan Medical Journal

基　　金：海南省卫生厅自然科学基金资助项目(编号:琼卫2011-25)

摘　　要：目的通过256层CT前瞻性心电门控与回顾性心电门控100kV与120kV冠状动脉成像的影像质量及辐射剂量等比较,探讨前瞻性心电门控100kV冠状动脉成像的可行性。方法拟诊冠状动脉粥样硬化性心脏病(CHD)患者分别进行前瞻性(前瞻组)和回顾性(回顾组)心电门控;分别以100kV与120kV扫描,并采用最大密度投影(MIP)、容积再现(VR)、多平面重组(MPR)及曲面重组(CPR)多种重组技术显示各节段冠状动脉,图像质量根据对诊断的影响分为优、良、差,计算各自有效辐射剂量并进行统计学分析。结果前瞻组平均辐射剂量为(2.26±0.48)mSv,100kV为(8.01±2.09)mSv,明显低于回顾组的(9.15±1.59)mSv(P<0.01),120kV为(16.2±2.09)mSv(P<0.01);前瞻组冠状动脉节段图像质量优良率与回顾组均为100%。100kV与120kV组图像噪声和主观评分差异无统计学意义(χ2=2.15,P=0.258)。结论 256层CT前瞻性心电门控,100kV冠状动脉成像能以较低的辐射剂量取得优质图像,更适合CHD患者的早期筛查。Objective To compare the image quality and radiation dosage of the prospective electrocardiogram （ECG） triggered computed tomography coronary angiography （CTCA） with retrospective ECG2 gated, 100 kV and 120 kV protocols CTCA. Methods Patients with suspected coronary artery disease were divided into two groups, in which the patients underwent CTCA with prospective ECG triggered or retrospective ECG gated 100 kV and 120 kV scanning （n=89 each）. Maximum intensity projection （MIP）, volume rendering （VR）, Multi2 planar recon- struction （MPR）, and curved planar reconstruction （CPR） were used to diagnosis the coronary arteries. Individual radiation exposure dose was estimated from the dose-length. Results The mean effective radiation dose of prospective ECG gated （2.26±0.48） mSv, 100 kV （8.01±2.09） mSv, was significantly lower than that of retrospective ECG gated （9.15±1.59） rosy. 120 kV （16.2±2.09） mSv. Segments of image quality （100%） in prospective ECG triggered group were similar as those of retrospective ECG gated group （100%）. No statistically significant difference was found in noise or subjective score in 100 kV and 120 kV. Conclusion The perfect images can be obtained with prospective ECG triggered and 100 kV CTCA with lower radiation dose, which is an optimal method for early screening.

关 键 词：X线计算机体层摄影术 冠状血管造影术 心电门控 管电压 

分 类 号：R445[医药卫生—影像医学与核医学]