Clinical effectiveness of improved temporal subtraction for digital chest radiographs
Clinical effectiveness of improved temporal subtraction for digital chest radiographs
复制标题
改进的数字胸片时间减法的临床效果
DOI：
10.1117/12.462693
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发表时间：
2002
影响因子：
3.3
通讯作者：
K. Ohtomo
中科院分区：
文献类型：
--
作者：
K. Nakagawa;Akira Oosawa;Hiroshi Tanaka;K. Ohtomo
我们进行了一项回顾性评估，以评估颞骨减影在胸部筛查中的作用。选取19张异常和30张正常的胸部CR筛查图像，生成包含当前、以前和时间减影（T-sub）图像的数据集。从后续CT扫描证实的异常病例中选择异常病例进行密切检查。在评估实验中，首先只显示当前和以前的胸部图像。在x光片观察者通过5步评定法判断任何异常发现的存在后，同一观察者再次使用T-sub图像进行判断。参与实验的医师分为三种，即具有两年或以上临床经验的诊断放射科医师、经验不足的放射科医师和非放射科医师。ROC分析的结果证实，使用时间减法总体上提高了约10%的Az值。在经验不足的医生组中，Az值的增加更为显著。这些医生的ROC曲线与经验丰富的放射科医生的曲线接近。这些结果强烈表明评估系统在胸部筛查中的临床疗效。
We have performed a retrospective evaluation to assess the effects of temporal subtraction in chest screening. Nineteen abnormal and 30 normal examples of chest CR screening images were selected, and a data set comprising current, previous, and temporal subtraction (T-sub) images were generated. Abnormal examples were chosen from cases with abnormal findings that were confirmed by subsequent CT scanning to need close examination. In the evaluation experiments, only current and previous chest images were displayed at first. After a radiograph observer judged the existence of any abnormal findings by the 5-step rating method, the same observer judged the case again using the T-sub image. Physicians of three different categories, namely diagnostic radiologists with clinical experience of two years or more, less experienced radiologists, and non-radiologists participated in the experiments. As a result of ROC analysis, it was confirmed that the use of temporal subtraction improves the Az value by about 10% overall. The Az value increase was more significant in the group of less experienced doctors. The ROC curves using T-sub image of these physicians approached those of the well-experienced radiologists. These results strongly indicate the clinical efficacy of the assessed system in chest screening.