高感度数字化全脊柱摄影的对照研究  

A comparative study of different sensitivity in full length spine digital radiography

作　　者：华建明[1] 蒋飚[1] 李万里[2] 章伟敏[1] 

机构地区：[1]浙江大学医学院附属第二医院放射科,杭州310009 [2]浙江大学医学院附属第二医院骨科,杭州310009

出　　处：《中华放射医学与防护杂志》2013年第3期323-325,共3页Chinese Journal of Radiological Medicine and Protection

摘　　要：目的探讨选择高感度数字化（DR）全脊柱摄影的临床应用及其x射线辐射防护价值。方法选取90例脊柱侧凸患者按感度等分成$200、$400和$8003组摄取正侧位全脊柱片。以$400组作为对照组计算，并比较3组不同感度曝光所产生的照射剂量（mGy）、曝光量（mAs）；盲式评判3组不同感度全脊柱片影像质量。结果当感度升至800时其照射剂量均值和曝光量均值约为对照组S400的43％和41％，两组差异有统计学意义（t=4．573、8．038，P〈0．05）；当感度设置为200时其照射剂量均值和曝光量均值约为对照组$400的187％和178％，两组差异有统计学意义（t=-5．624、-4．052，P〈0．05）。感度为200、400时，其正位、侧位影像质量均为优或良，优良率均为100％；感度为800时，其正位、侧位影像质量仍以优、良为主，优良率分别为100％和97％，侧位出现1例中等级影像。结论对以观察椎体及大范围的脊柱主体形态为主要诊治目的的DR全脊柱摄影可适宜地选择感度S800进行拍摄。Objective To explore the value of high sensitivity total spine digital radiography in radiation protection and clinical application. Methods A total of 90 patients suffering from seoliosis were randomly divided into three groups with different sensitivity such as S200, S400 and S800. All of them were examined with anterior-posterior and lateral full length spine digital radiography. The S400 group was designated as control group. The doses （mGy） and exposures （mAs） resulted from different groups were calculated and compared, including their means and deviations. Image quality was evaluated with blind method. Results In the S800 group, the doses and exposures were about 43% and 41% compared to the S400 group. The differences were statistically significant （t = 4. 573, 8. 038, P 〈 0. 05 ）. Doses and exposures in the S200 group were about 187% and 178% compared to the control group. The differences were also significant（t = -5. 624, -4. 052, P 〈 0.05）. In the S200 and S400 group, image quality of anterior-posterior and lateral position was 100% good. When sensitivity was S800 was selected, image quality of the anterior-posterior position was 100% good, and 97% for lateral images. One lateral image was considered noisy. Conclusions In full length spine radiography, high sensitivity （S800） could greatly reduce radiation dose to patients. It is a good choice to use the sensitivity to observe wide-range spine. [ Key words] Digitalization; Full length spine radiography; Scoliosis; Sensitivity; Radiation dose

关 键 词：数字化 全脊柱摄影 脊柱侧凸 感度 照射剂量 

分 类 号：R816[医药卫生—放射医学] R6[医药卫生—临床医学]