眼眶多层螺旋CT低剂量扫描技术的临床应用  

Clinical application of low-dose CT scan technique in orbit

作　　者：冯丰吟[1] 郑兆华[1] 邓家秀[1] 

机构地区：[1]深圳市宝安区西乡人民医院放射科,广东省深圳518000

出　　处：《中国基层医药》2011年第23期3211-3212,I0004,共3页Chinese Journal of Primary Medicine and Pharmacy

摘　　要：目的探讨眼眶多层螺旋CT低剂量扫描技术对图像质量及眼晶状体所受辐射剂量的影响。方法对60例受检者设置不同扫描条件进行轴位CT扫描，A组采用120kV、120mA，B组采用120kV、50mA，C组采用120kV、30mA进行扫描，评价三组图像质量和受检者眼晶状体所受的辐射剂量（CTDIv01）。结果A组图像评质量分为（11．2±0．7）分，高于c组的（4．9±．I．8）分（t=12．634，P〈0．05），与B组的（10．6±1．1）评分差异无统计学意义（P〉0．05）。A组、B组、c组CTDIv01分别为18．32mGy、7．63mGy和4．58mGy，B组和C组与A组差异有统计学意义（t=15．625、14．037，均P〈0．05）；B组与c组差异无统计学意义（P〉0．05）。结论眼眶多层螺旋CT低剂量（120kV、50mA）扫描既可保证眼眶部病变的影像质量，又可降低患者的辐射剂量。Objective To explore the effects of low-dose CT scan on diagnostic quality of images and the radiation dose to the lens. Methods 60 cases were scanned in axial orientation at different mA. Lens radiation dose was measured and image quality was evaluated. Results Image quality score of group A was （ 11. 2 ± 0.7） points, higher than the group C （4.9±1.8） points （ t = 12.634, P 〈 0.05 ）, and score difference of group B （ 10.6± 1.1 ） was significantly different（P 〉0.05）. CTDIvol of group A,group B and group C were 18.32mGy,7.63mGy and 4.58mGy, group B, group C and group A difference was statistically significant （ t = 15. 625 and 14.037, P 〈 0.05 ）. Group B and C groups difference was not statistically significant（P 〉0.05）. Conclusion Low dose CT scanning（50mA） in orbit not only could assure the image quality, but also decrease the radiation dose.

关 键 词：体层摄影术 X线计算机 辐射剂量 眼眶 

分 类 号：R77[医药卫生—眼科] R816[医药卫生—临床医学]