Again, when we look at a radiographic image, we are essentially looking at 2 components, density (darkness of image) and contrast (grayness). In this module, we'll begin to figure out what parameters affect density, contrast, or both.
Density is defined as the overall "blackness' of an image. The greater the density, the darker or the image is. We can refer to the knee x-rays below. Image A can be said to have greater radiographic density when compared to image B. If we want to increase or decrease density of a radiograph, we will increase or decrease mAs.