MacMahon H, Vyborny C J, Metz C E, Doi K, Sabeti V, Solomon S L
Radiology. 1986 Jan;158(1):21-6. doi: 10.1148/radiology.158.1.3940383.
Forty conventional radiographs with examples of mild interstitial infiltrates and subtle pneumothoraces and 40 normal studies of the chest were selected and digitized, with pixel sizes of 1.0, 0.5, 0.2, and 0.1 mm. Observer performance tests were carried out using receiver operating characteristic analysis. Conventional radiographs and digitized images were compared. The results indicate that, in such cases, diagnostic accuracy increases significantly as the pixel size is reduced, at least to the 0.1-mm level. We conclude that, for digital systems using screen-film or similar image receptors, use of a pixel size substantially larger than 0.1 mm may result in some loss of diagnostic accuracy.
选取了40例有轻度间质浸润和细微气胸示例的传统X线片以及40例正常胸部检查影像，并进行数字化处理，像素大小分别为1.0、0.5、0.2和0.1毫米。使用接受者操作特征分析进行观察者性能测试。对传统X线片和数字化图像进行比较。结果表明，在此类情况下，随着像素大小减小，诊断准确性显著提高，至少在0.1毫米级别。我们得出结论，对于使用屏-片或类似图像接收器的数字系统，使用远大于0.1毫米的像素大小可能会导致一定程度的诊断准确性损失。
