A radiograph is an image generated by x-rays passing
through an object and exposing film. X-rays penetrate different
parts of the body at different rates depending on its density. For
example, air is much less dense than bone and therefore it is easy
to see the difference (air is black and bone is white). Fat and
fluid are of medium density and offer contrast to the surrounding
body structures. Furthermore, in order to obtain clear radiographic
images in veterinary medicine several things must be done. First
our x-ray machine operates at a high level for short periods of
time to minimize motion. We have yet to have a patient respond when
we ask them to "take a deep breath and hold it". Secondly,
we use x-ray cassettes with intensifying screens to reduce our exposure
time, which again reduces motion and is safer for our staff. Finally,
we use an automatic processor. This machine develops our radiographs
in 60-90 seconds allowing us to evaluate them right away and when
necessary take additional views. Radiographs, combined in some instances
with ultrasound, are useful and often necessary to diagnose a disease
process. The radiographs are evaluated by the doctor, discussed
with the client, and stored for future reference.