USING X-RAYS TO LOOKAT THE BODY
X-rays are perhaps the most widely used method of
imaging the body. When passed through body tissues on to
photographic film, X-rays cast images of internal structures,
allowing alterations in silhouette to be seen. Soft tissues do
not show up as well as bone on X-rays, but, by using a
contrast medium, theytoo can be visualized. New computer
techniques produce even clearer, more detailed images,
making X-ray an increasingly efficient diagnostic tool.
3-D CT scan
A computer can transform X-rayimages of
body slices into a three-dimensional image
of part ofthe body.
Introducing barium, which is opaque to
X-rays, into the large intestine allows it
to be visualized.
Combined use of
a computer and
images. In this
brain scan, the
white area is a
mass of blood
X-ray of hip joint
This X-ray of an osteoarthritic
hip shows almost complete
degeneration of the cartilage.
X-rays ofknee joint
The X-ray on the left shows erosion of bone and
cartilage. The parts of an artificial knee are seen
in the X-ray on the right.
X-rays allow bones and internal
organs to be imaged.
X-ray of foot
All the bones can be clearly seen in this
X-ray of a healthy foot.