Verdenet J, Cardot J C, Baud M, Chervet H, Duvernoy J, Bidet R
Eur J Nucl Med. 1981;6(6):261-4. doi: 10.1007/BF00251349.
This article develops two contrast-modification techniques for the display of scintigraphic images. Based on histogram-modification techniques, histogram equalization, where each level of gray is used to the same extent, gives maximum entropy. The first technique uses the application of histogram equalization in the whole image. To eliminate contrast attenuation small but important portion of the gray scale histogram, local area histogram equalization has been applied to images with differences in intensity. Both techniques were tested using a phantom with known characteristics. The global equalization technique is more suitable to bone scintigraphies, and some well-chosen boundaries improved the difference between two comparable areas. For liver scintigraphies, where intensity is quite equal in every pixel, a local area equalization was chosen that allowed detection of heterogeneous structures. The images resulting from histogram-equalization techniques improve the readability of data, but are often far from usual images and necessitate an apprenticeship for the physician.
本文开发了两种用于闪烁图像显示的对比度修正技术。基于直方图修正技术，直方图均衡化（其中每个灰度级都被同等程度地使用）可给出最大熵。第一种技术是在整个图像中应用直方图均衡化。为了消除对比度衰减（灰度级直方图中虽小但很重要的部分），局部区域直方图均衡化已应用于强度有差异的图像。这两种技术都使用具有已知特征的体模进行了测试。全局均衡化技术更适用于骨闪烁显像，一些精心选择的边界改善了两个可比区域之间的差异。对于肝脏闪烁显像，其中每个像素的强度相当均匀，则选择了局部区域均衡化，这使得能够检测到异质结构。由直方图均衡化技术生成的图像提高了数据的可读性，但往往与常规图像相差甚远，并且需要医生进行学习。
