those changes as discussed below the particular hue and intensity of a changed portion of the image can be used to indicate when the change occurred in interpreting the color composite image in fig4 it is useful to recognize that the oldest or baseline image is tinted blue the most recent image is tinted red and an image taken between these two images is tinted green assuming this particular sequence recent changes will tend to be in warmer colors and less recent changes will tend to be in cooler colors the sequencing of colors blue green red can be altered to represent other imaging sequences e g ct us and other morphological changes this sequence is intuitive for images in which pathological changes are associated with local hyperintensities thus a very recent hyperintensity in image three will add more red to the mixed image and appear as a warmer color indicating recent pathology a reversal of the order red green blue would be intuitive for images in which active changes result in hypointensity i e image pixels becoming darker fig5 is a color cube suggesting how the colors in the color composite image might be interpreted for example in the color composite image in fig4 active lesions i e those that are of most recent origin tend to be red recurrent lesions tend to be a combination of red and blue resolving lesions tend toward blue with more recently resolving regions tending to a bluish green lesions that have peaked recently and have only just begun.