Gray J E, Taylor K W, Hobbs B B
AJR Am J Roentgenol. 1978 Aug;131(2):247-53. doi: 10.2214/ajr.131.2.247.
The detection accuracy of the diagnostic radiologist is important in everyday medical decision making. However, little work has been done relating the detection accuracy of the radiologist to the quality of the image. This study, using a thorax and lung phantom, simulated tissue-equivalent 6.4 mm lesions, and a 183 cm source-to-image distance, shows that the detection accuracy is not dependent on the focal spot size (over a range of 0.3-2.0 mm). However, the false positive rate increases when using small focal spots. In addition, the detection accuracy decreases with increasing root-mean-square (RMS) noise (a measure of the amount of quantum mottle in the image), while the false positive rate and intraobserver disagreement increase with increasing RMS noise. It is also shown that the nonradiologist responds to changes in noise in exactly the same way as the radiologist.
在日常医疗决策中，诊断放射科医生的检测准确性至关重要。然而，关于放射科医生的检测准确性与图像质量之间的关系，相关研究甚少。本研究使用胸部和肺部模型、模拟的等效组织6.4毫米病变以及183厘米的源-图像距离，结果表明检测准确性并不取决于焦点尺寸（在0.3 - 2.0毫米范围内）。然而，使用小焦点时假阳性率会增加。此外，检测准确性会随着均方根（RMS）噪声的增加而降低（RMS噪声是图像中量子斑点数量的一种度量），而假阳性率和观察者内分歧会随着RMS噪声的增加而增加。研究还表明，非放射科医生对噪声变化的反应方式与放射科医生完全相同。
