Key Terms Principles Of Rad Imaging (Chapter 10)

Front 1

Process of eliminating the undesirable low-energy x-ray photons by the insertion of absorbing material into the primary beam.

Back 1

Filtration
(Hardening the Beam)

Front 2

Any material designed to selectively absorb photons from the x-ray beam.

Back 2

Filter

Front 3

Most common filter material used.

Back 3

Aluminum

Front 4

Aluminum thickness is express as...

Back 4

Aluminum Equivalency (Al/Eq):
Considered the standard filtering material, all filtration can be expressed in terms of its thickness.

Front 5

Half-Value Layer (HVL)

Back 5

Amount of absorbing material that will reduce the intensity of the primary beam to one-half its origional value.

Front 6

Inherent Filtration

Back 6

Filtration that is part of the Tube and Housing, glass envelope of the tube, dielectric oil that surrounds the tube, glass window of the housing.

Front 7

Added Filtration

Back 7

Any filtration that occurs outside the tube and housing and before the image receptor.

Front 8

Compound Filtration

Back 8

Also known as K-edge filters.
Use two or more materials that compliment one another in their absorbing abilities.

Front 9

In a compound filter where is the material with the highest atomic number placed?

Back 9

Closest to the tube.

Front 10

Example of a compound filter.

Back 10

Thoreaus Filter, used for radiation therapy.

Front 11

Compensation Filtration

Back 11

Filter designed to solve a problem with unequal subject densities.
Wedge and Trough filters.

Front 12

Inherent Filtration + Added Filtration

Back 12

Total Filtration

Front 13

When filtration is increased, technical factors must be ? to maintain the same image receptor exposure

Back 13

Increased