Understanding our Sluts and NM "limited" resolution it can be stated that minor changes in counts per pixel may not be seen.Yet the human eye is more sensitive to green and yellow when compared to blue and red.
The human eye can see over 1 million types of color, hence the eye is more "sensitive" to a tricolor scale.Therefore, given 256 shades of gray, it takes 5 shades in either direction to realize a slight change in the scale Related to shades of gray the human eye can only see about a 2% change in brightness.What kind of detail can we actually see?.Example of how different color scales effect how we visually see a bone scan.Perigees states 262,000 shades or combinations can be used, however, if each color represents 2 8 shades then there are 2 8 x 2 8 x 2 8 = 1.67 x 10 7 (red, green, and blue) combinations This further increases the ability to find minor changes in counts when all three primary colors are used.A blending of colors increases the amount variation between the amount of counts to pixels and the amount of color shades per count(s).LUT combinations use up to three primary colors are Red, Green, and Blue (remember robbing?).LUT can also be assigned to many types of color scales which may further enhance the imaged data and may improve the diagnostic quality of a study.A gray scale can also be inverted where the hottest pixel becomes black and white indicates no counts.Given the above gray scale the pixel(s) with the maximum number of counts is white (or clear) and the pixels with the least counts is black.When displaying counts from an acquisition the computer applies a Look-Up Table (LUT) that assigns counts/pixel with XY coordinates.A gray scale has 256 shades (2 8) of gray that relates to the amount of counts in an image.This variation in counts shows a variation in the gray scale where increasing shades of gray relates to a decease in the number of counts.The above matrix shows a count value in each cell notices that it decreases in descending order with the lower right containing 50 counts and upper left at 0 counts.
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