不同感度数字化胸部X线摄影对图像质量的影响  

Effect of Different Sensitivity on Image Quality of Digital Chest Radiography

作　　者：朱纯生[1] 洪国斌[2] 何强[1] 范宪淼[1] 郑晓林[1] 

机构地区：[1]东莞市人民医院放射科,广东东莞523000 [2]中山大学附属第五医院放射科,广东珠海519000

出　　处：《中国医学影像学杂志》2013年第12期907-910,共4页Chinese Journal of Medical Imaging

摘　　要：目的探时不同感度数字化胸部X线正位摄影对图像顷最和辐射剂量的影响。资料与方法随机选择300例行胸部X线榆查的健康体检暂，按体再指数分为正常组150例和超晕组150例，每组再随机分为低感度组、小感度组和高感度组3个亚组（每亚组各50例），在其他参数不变的情况下每个亚组分别行S200、S400和S800数字化胸部X线正位摄影，并上传至PACS上作站，记录每次曝光的曝光量和辐射剂量面积乘积（DAP）值，由3位医师对图像质量进行评价，比较抨组受检者在不同感度下的曝光量、DAP、图像质量评分和噪声情况。结果正常组中低感度组、中感度组和高感度组的曝光量及DAP差异有统计学意义（F=443．19～829．895，P〈0．05），图像质量比较和噪声比较差异无统计学意义（F=0．686～2．516，P〉0．05）。超重组中低感度组、中感度组和高感度组下的曝光量、DAP、图像质量评分及噪声比较差异有统计学意义（F=163．358～290．656，P〈0．05）。单因素方差分析两两对比，两组曝光量值低感度组〉中感度组〉高感度组（F=0．626～31210，P〈0．05），DAP值低感度组〉中感度组〉高感度（F=0．416～1．416，P〈0．05），正常组图像质量比较及噪声比较无差别（F=O．001～0．100．P〉0．05），在超最组中低感度组与中感度组无差别（F=0．120～0．145，P〉0．05），低感度组与商感度组及中感度组与商感度组有筹异（F=1655～2．360，P〈0．05）。结论调节感度可以在不影响图像质量的前提下有效控制辐射剂量。正常体型可以选择高感度摄影，而趟重体型可以选择中感度或低感度摄影。Purpose To investigate the effect of sensitivity on image quality and radiation dosage of digital chest radiography. Materials and Methods A total of 300 healthy people undergoing chest X-ray examination were randomly enrolled and divided into two groups according to body weight （150 people with normal weight and 150 overweight）, which were further randomly divided into three subgroups （S200 subgroup with low sensitivity, S400 subgroup with mid-sensitivity, S800 subgroup with high sensitivity, each subgroup contained 50 people）. With other parameters unchanged, digital chest photography with different sensitivities was performed to each subgroup （S200, S400 and S800, respectively）, and then uploaded the data to PACS and recorded mAs value and dose area product （DAP） value for each time. Then the image quality was assessed by three doctors in terms ofmAs value, DAP, image quality score and noise score. Results In all subgroups of normal weight, differences on mAs and DAP were significant （F= 1443.191- 1829.895, P〈0.05） whilst differences on image quality score and noise score were not significant （F=0.686-2.516, P〉0.05）. In all overweight subgroups, differences in mAs, DAP, image quality score and noise score were significant （F=163.358-290.656, P〈0.05）. According to one-factor analysis of variance, mAs value was S200〉S400〉S800 （F=0.626- 3.210, P〈0.05）, DAP value was S200〉S400〉S800 （F=0.416-1.416, P〈0.05）, there was no difference in image quality score and noise score （F-0.001-0.100, P〉0.05）. In overweight group, there was no difference between subgroups of S200 and S400 （F=0.120-0.145, P〉0.05）; whilst diff＇erences between subgroups of S200 and S800 were significant, the same appeared in subgroups of S400 and $800 （F=1.655-2.360, P〈0.05）. Conclusion Radiation dose can be effectively controlled by regulating sensitivity with image quality unaffected. It is advisable to choose high-sensitivity photography for patients with normal weight and lo

关 键 词：放射摄影术 胸部 感光度 图像质量 质量控制 辐射剂量 

分 类 号：R445.9[医药卫生—影像医学与核医学]