Sharp P, Mallard J
Br J Radiol. 1976 Mar;49(579):270-7. doi: 10.1259/0007-1285-49-579-270.
An assessment has been made of the performance of the type of display system in which each display signal intensity, i.e. grey shade or colour, represents a range of count densities or counting rates. In the particular commercially available system used in this investigation eight different grey shades are used to display the image, a range of count densities beingallocated to each grey shade. It is shown experimentally that changes in the distribution of radioisotope can fail to be detected solely due to the manner in which the display is used, viz. The way in which the count density is allocated to the available grey shades. Also, it is shown experimentally that the best display performance can be achieved by using one in which the range of count densities represented by each grey shade is less than three standard deviations of the mean background [corrected] count density.
对一种显示系统的性能进行了评估，在该系统中，每个显示信号强度，即灰度或颜色，代表一系列计数密度或计数率。在本研究中使用的特定商用系统中，使用八种不同的灰度来显示图像，每个灰度分配了一系列计数密度。实验表明，仅由于显示的使用方式，即计数密度分配到可用灰度的方式，放射性同位素分布的变化可能无法被检测到。此外，实验表明，通过使用一种每个灰度代表的计数密度范围小于平均背景[校正后]计数密度的三个标准差的显示系统，可以实现最佳的显示性能。
