MRI specifies on the signals from the H2O molecules. So the grade displays a image by the color within the grayscale.
CT The images specifies the different tissue by density of tissues. According to the density, the film will show a image within the grayscale. Higher density tissues block more X rays, so the film will be exposed lower X rays and present more white color. For example: Bone(high density-white)> soft tissue > fat > water > Air(low density-black)
CT The images specifies the different tissue by density of tissues. According to the density, the film will show a image within the grayscale. Higher density tissues block more X rays, so the film will be exposed lower X rays and present more white color. For example: Bone(high density-white)> soft tissue > fat > water > Air(low density-black)
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