320排容积CT冠脉成像低剂量扫描的应用

目的评价320排容积CT在冠脉成像低剂量扫描的应用价值。方法对临床拟诊断为冠心病的120例患者,进行宽探测器平台下动态容积扫描,将其分为常规组（A组）和低剂量组（P组）,每组60例。A组采用CTA/CFA扫描方法,P组采用前瞻性冠脉扫描方法,对A组和P组图像质量、容积CT剂量指数（CTD Ivol）和有效剂量（ED）进行评估。结果 A组和P组冠脉成像的图像质量两组间无显著差异（P〉0.05）。A组和P组的CTDIvol分别为（36.3±3.48）mGy/cm和（17.4±1.67）mGy/cm,ED分别为（9.87±0.96）mSv和（4.73±0.43）mSv,P组的CTD Ivol和ED均明显低于A组（P〈0.05）。结论低剂量扫描方法能明显降低受检者的射线剂量,又能达到诊断要求,值得推广。

Applications of 320 Slice CT in Coronary Artery Imaging with Low-dose Scanning

Objective To evaluate the value of 320 slice CT in coronary artery imaging with low-dose scanning.Methods 120 pati ents diagnosed for coronary heart disease were scanned dynamically on the wide probe platform,and were divided into the conventional group（A group） and low-dose group（P group）,60 cases each group.The scanning method of CTA/CFA was used in the Group A and prospective CTA in the Group P,the image quality,CTA Ivol and ED in both Group A and Group P were evaluated.Results The image quality had no significantly difference between the two groups（P0.05）.CTD Ivol of Group A and Group P was（36.3±3.48） mGy/cm and（17.4±1.67） mGy/cm respectively,（9.87±0.96） mSv and（4.73±0.43） mSv for ED.CTD Ivol and ED of Group P were obviously lower than those of Group A（P0.05）.Conclusion The low-dose scanning method can significantly reduce radiating dose of the patients,and can meet the demands of diagnose,which is worth popularizing.