Young-Min Steven A, Shakhapur Sanjeev, Marshall Nicky, Griffiths Ian, Cawston Tim, Grainger Andrew
Department of Rheumatology, University of Newcastle-upon-Tyne, Newcastle-upon-Tyne, UK.
J Rheumatol. 2003 Feb;30(2):238-40.
To facilitate storage, retrieval, and analysis of radiographic images we assessed the validity of a film digitizer and computer based system.
A total of 101 sets of radiographs of hands and feet from patients with early rheumatoid arthritis were digitized according to standards defined by the American College of Radiology. Two blinded observers applied the modified Larsen score to the digitized images and the original radiographs.
There was good concordance between the scoring of digitized images and radiographic films; intraclass correlation coefficient was 0.89. Regression analysis of a Bland-Altman plot revealed that there was no significant systematic bias. It was noted that scoring the digital images took more than twice as long as scoring the radiographic films.
Our results indicate that modified Larsen scoring of adequately digitized films on standard computer displays is valid and shows good agreement with conventional techniques. Scoring digitized images appears to require more time, but this may be outweighed by the considerable advantages of computer storage and retrieval of radiographic images.
为便于X线影像的存储、检索及分析，我们评估了胶片数字化仪和基于计算机的系统的有效性。
按照美国放射学会定义的标准，对101例早期类风湿关节炎患者的手足X线片进行数字化处理。两名盲法观察者对数字化图像和原始X线片应用改良Larsen评分。
数字化图像评分与X线片评分之间具有良好的一致性；组内相关系数为0.89。Bland-Altman图的回归分析显示无显著的系统偏差。值得注意的是，对数字图像评分所需时间是对X线片评分的两倍多。
我们的结果表明，在标准计算机显示器上对充分数字化的胶片进行改良Larsen评分是有效的，并且与传统技术有良好的一致性。对数字化图像评分似乎需要更多时间，但计算机存储和检索X线影像的显著优势可能会弥补这一不足。
