Rogers W L, Keyes J W
J Nucl Med. 1981 Mar;22(3):283-6.
Accurate, reproducible recording of gray-scale images from a computer requires careful calibration and control of the factors that affect photographic exposure. These include exposure time, CRT brightness and contrast, film type, and photographic processing. A method is described for calibrating the imaging system; it accounts for nonlinear CRT phosphor and film response and permits the recording of any desired gray scale. The key to this technique is a graphical method for correlating the measured film response with the desired gray scale in order to develop a translation table that will in turn produce the desired gray scale on film. The technique is applicable to any computerized nuclear medicine display system.
要从计算机准确、可重复地记录灰度图像，需要仔细校准和控制影响照片曝光的因素。这些因素包括曝光时间、阴极射线管（CRT）亮度和对比度、胶片类型以及照片冲洗过程。本文描述了一种校准成像系统的方法；它考虑了CRT磷光体和胶片响应的非线性，并允许记录任何所需的灰度。该技术的关键是一种图形方法，用于将测量的胶片响应与所需的灰度相关联，以便生成一个转换表，进而在胶片上产生所需的灰度。该技术适用于任何计算机化的核医学显示系统。
