Kimme-Smith C, Sun H, Bassett L W, Gold R H
Iris Cantor Center for Breast Imaging, University of California Los Angeles Medical Center 90024-1721.
Radiographics. 1992 Nov;12(6):1137-46. doi: 10.1148/radiographics.12.6.1439016.
With the increasingly stringent standards of image quality in mammography, film processor quality control is especially important. Current methods are not sufficient for ensuring good processing. The authors used a sensitometer and densitometer system to evaluate the performance of 22 processors at 16 mammographic facilities. Standard sensitometric values of two films were established, and processor performance was assessed for variations from these standards. Developer chemistry of each processor was analyzed and correlated with its sensitometric values. Ten processors were retested, and nine were found to be out of calibration. The developer components of hydroquinone, sulfites, bromide, and alkalinity varied the most, and low concentrations of hydroquinone were associated with lower average gradients at two facilities. Use of the sensitometer and densitometer system helps identify out-of-calibration processors, but further study is needed to correlate sensitometric values with developer component values. The authors believe that present quality control would be improved if sensitometric or other tests could be used to identify developer components that are out of calibration.
随着乳腺钼靶摄影图像质量标准日益严格，胶片冲洗机的质量控制尤为重要。目前的方法不足以确保良好的冲洗效果。作者使用感光计和密度计系统评估了16家乳腺钼靶摄影机构中22台冲洗机的性能。确定了两种胶片的标准感光值，并评估了冲洗机性能与这些标准的差异。分析了每台冲洗机的显影剂化学成分，并将其与感光值相关联。对10台冲洗机进行了重新测试，发现9台未校准。对苯二酚、亚硫酸盐、溴化物和碱度等显影剂成分变化最大，在两家机构中，对苯二酚浓度较低与平均梯度较低有关。使用感光计和密度计系统有助于识别未校准的冲洗机，但需要进一步研究以将感光值与显影剂成分值相关联。作者认为，如果能使用感光测试或其他测试来识别未校准的显影剂成分，当前的质量控制将会得到改善。
