Specific placement of central ray in relation to an anatomical
part or palpation point so that the part or point is projected to
the center of the film/cassette.
The limiting of a beam of radiation to the required dimensions.
Pertaining to the crown of the head
Frontal plane along the
long axis of the body that
divides the body into its
front and back halves.
Acronym for central ray; the CR is the central beam of rays
emanating from the X-ray tube.
Acronym for chest X-ray.
A body position meaning to lie on a horizontal surface. This
term is used to denote both a recumbent body position and the
use of a horizontal x-ray beam. The patient may be lying on the
back (dorsal), front (ventral), or side (right or left lateral).
Decubitus positions are used to detect air-fluid levels or free air
in a body cavity, such as the chest or abdomen.
Away from the source or away from the trunk.