Krupinski Elizabeth A
Emory University, Department of Radiology and Imaging Sciences, Atlanta, Georgia, United States.
J Med Imaging (Bellingham). 2018 Jul;5(3):035501. doi: 10.1117/1.JMI.5.3.035501. Epub 2018 Jul 27.
Reducing dose increases noise impacting image quality but can be offset by increasing display luminance. Two contrast detail mammography images were obtained at 26 kV and the same distance between detectors, at 45 and 50 mAs resulting in entrance surface doses of 7.09 and 7.88 mGy, respectively. They were processed to make average gray level of the background independent of the dose level while maintaining original SNR. Eight radiologists viewed the images at 420, , and SpotView™ a tool that resulted in an average display luminance of . Percent correct (PC) for all three luminances was higher for high versus low dose. Performance was always higher with high dose no matter what the luminance. For low dose, PC was highest with SpotView™, and SpotView™ and were significantly higher than . At high dose, SpotView™ PC was significantly higher than both lower luminances. Average time per image was lower in high dose, and, at both doses, time decreased as luminance increased, with SpotView™ having significantly shorter times. Increasing luminance from 420 to significantly increases target detection by and with SpotView™ by . Increasing display luminance with SpotView™ significantly decreases reading time by 16.0%.
降低剂量会增加影响图像质量的噪声，但可通过提高显示亮度来抵消。在26 kV以及探测器之间相同距离的条件下，获取了两幅乳腺对比细节图像，分别采用45和50 mAs的剂量，对应的体表入射剂量分别为7.09和7.88 mGy。对这些图像进行处理，使背景的平均灰度级与剂量水平无关，同时保持原始信噪比。八位放射科医生在420、 以及SpotView™（一种平均显示亮度为 的工具）条件下查看图像。高剂量时，所有三种亮度下的正确百分比（PC）均高于低剂量。无论亮度如何，高剂量时的表现总是更好。对于低剂量，SpotView™条件下的PC最高，且SpotView™和 条件下的PC显著高于 条件下的。高剂量时，SpotView™条件下的PC显著高于较低亮度条件下的。高剂量时每张图像的平均查看时间较短，并且在两种剂量下，随着亮度增加时间减少，SpotView™条件下的时间显著更短。将亮度从420提高到 ， 使用 和SpotView™时的目标检测分别显著提高了 和 。使用SpotView™提高显示亮度可使阅读时间显著减少16.0%。
