Film Optical Density. Film screen. Radiographic Density Overall blackening of the radiographic image as a result of the energy deposited inthe film emulsion. Film screen. Radiographic Contrast / Grayscale The difference between two adjacent radiographic densities in the image.
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Radiographic Contrast / Grayscale
(average OD seen on a radiograph = 1.2 Range is 0.21 – 2.5)
# of photons coming through film = OD # # of photons hitting film
OD= 1 2 3
1 = 0 100 1 = 1 1011 = 2 1021 = 3 103
1 10 100 1000
light transmitted through the film is an expression of which of the following?