avb
§Bone – calcium – greater attenuation : white image
§Soft tissues – less attenuation – gray image
§Air – least attenuation, dark areas
However … thickness also
matters!
The knee was a good example with bones and muscles. Since
we are not studying details of the knee, we shall take the familiar example of
a chest X-ray. But before we do that, a bit of basic directional terminology!
Image Densities
