基于离体头颅标本牙齿CT扫描探讨CARE kV技术降低辐射剂量的准确性  

Based on the teeth in vitro skull specimen to investigate CARE kV CT scan technology of decreasing radiation dose

作　　者：曾宪 春王 玉权 蒲伟[1] 徐睿[1] 王荣品[1] 

机构地区：[1]贵州省人民医院影像科,贵阳市550002

出　　处：《实用医学杂志》2016年第11期1813-1816,共4页The Journal of Practical Medicine

基　　金：贵州省卫生计生委科学技术基金资助项目(编号:gzwk J2014-1-056)

摘　　要：目的:基于离体头颅标本牙齿CT扫描探讨CARE k V技术降低辐射剂量的可行性及准确性。方法:对8具防腐固定离体头颅标本牙齿重复行A、B、C组扫描,A组常规扫描(100 k Vp/150 m As);B组开启CARE Dose 4D扫描,电压100 k Vp,参考电流150 m As;C组CARE k V扫描,参考电压100 k V、参考电流150 m As,其余条件保持不变。比较3组的辐射剂量、图像的平均CT值、噪声、SNR、CNR、主观评分等。结果:3组方案实际扫描管电流、管电压及辐射剂量均有统计学差异(P<0.05),与A组比较,B组ED减低约13.76%,C组ED减低26.61%;图像的平均CT值、噪声、SNR、CNR及主观评分比较无明显统计学差异(P>0.05)。结论:基于离体头颅标本牙齿运用CARE k V技术行CT扫描能降低扫描辐射剂量、保障图像质量,其准确性与不同个体间相同部位的研究报道一致。Objective Based on the teeth in vitro skull specimen to investigate the feasibility and accuracy of CARE kV CT scan for reducing radiation dose. Methods Of eight fixed and preserved skull teeth were scanned repeatedly in groups of A, B, C. In expose factors of 100 kVp/150 mAs in conventional scanning of group A, open CARE Dose 4D scan of group B and CARE kV scan of group C. We assessed the radiation dose in the group A, B and C, the average CT values of the images, noise, SNR, CNR and subjective ratings. Results Three groups of actual scan tube current, tube voltage and radiation dose were statistically significant （P 〈 0.05）. Compared with group A, the radiation dose in the group B was reduced by about 13.76% and 26.61% reduced in the C group. The average CT values of the images and the noise SNR, CNR and subjective ratings hasd no significant difference （P 〉 0.05）. Conclusion CARE kV technology based on the use specimens tooth can reduce the radiation dose, protect image quality, and be consistent to the reports of previous researches.

关 键 词：离体头颅标本 CARE KV 牙齿CT扫描 辐射剂量 

分 类 号：R816.98[医药卫生—放射医学]