compensating filter

compensating filter,

a device, such as a wedge of aluminum, clay, or plastic, that is placed over a body area during radiography to compensate for differences in radiopacity. For example, a wedge may be placed over a foot with the thick portion over the toes and the thin edge toward the heel to compensate for the range of thickness of the foot. See also bowtie filter.

---

filter,

n a material placed in the useful beam to absorb preferentially the less energetic (less penetrating) radiations. See also filtration.

filter, added,

n a filter added to the inherent filter.

filter, compensating,

n a filter designed to shield less dense areas so that a more uniform image quality will be produced.

filter, inherent,

n the filtration introduced by the glass wall of the radiographic tube, any oil used for tube immersion, or any permanent tube enclosure in the path of useful beam.

filter, orange,

n the recommended safelight filter for darkroom illumination when processing intraoral film only. Also called filter type ML-2.

filter, red,

n the recommended safelight filter for darkroom illumination when processing either intraoral or extraoral film. Also called filter type GBX-2.

filter, total,

n the sum of inherent and added filters.