眼眶部低剂量CT扫描的辐射防护  

Radiation Protection of Low Dose CT Scanning in Orbit

作　　者：王刚[1] 白艳[1] 向建斯[1] 郑树卿[1] 

机构地区：[1]湖北省新华医院放射科,湖北武汉430015

出　　处：《实用放射学杂志》2007年第7期960-962,共3页Journal of Practical Radiology

摘　　要：目的探讨眼眶部低剂量CT扫描的辐射防护方法对126例眼眶部患者分别用原机标准条件(130kV,100mA),2种不同低剂量条件(130kV,50mA或30mA),在征得其同意的情况下进行CT扫描,然后采用不同卷积函数值(Kernel)重建成像;比较不同毫安组的图像质量及权重CT剂量学指数(CTDIw)的差别结果30mA时CTDIw最小,为常规剂量扫描的30%,但图像质量与常规剂量相比差异有高度显著性(P<0.01);50mA时,CTDIw为常规剂量扫描的50%,图像质量与常规剂量相比差异无显著性(P>0.05)结论眼眶部低剂量(50mA)CT扫描既可保证眼眶部病变的影像质量。Objective To study radiation protection of low dose CT scanning in orbit. Methods 126 eases of orbital disease were scanned by original standard parameter （ 130 kV,100 mA） and two different low dose parameters （ 130 kV,50 mA and 30 mA） respectively. All the images were reconstructed by different Kernels. The image quality and difference of the CTDIw （ weighted CT dose index ） of each group were compared. Results CTDIw was 30% of that of the conventional scanning and least when 130 kV 30 mA, but the difference of the image quality compared with that by conventional scanning was highly statistical significance （ P 〈 0.01 ） ; CTDIw was 50% of that of the conventional scanning when 130 kV 50 mA and the difference of the image quality compared with that by conventional scanning had no statistical signifieanee （ P 〉 0.05 ）. Conclusion Low dose CT scanning （50mA） in orbit not only can assure the image quality but also can de- crease the radiation dose.

关 键 词：低剂量 眼眶 辐射防护 体层摄影术 X线计算机 

分 类 号：R322.91[医药卫生—人体解剖和组织胚胎学] R814.42[医药卫生—基础医学]