Filtration

Filtration is the process of shaping the X-ray beam to increase the ratio of photons useful for imaging. It is the removal of parts of the X-ray spectrum using absorbing materials in the X-ray beam.

Types of Filtration:

Filtration is in principal divided into 2 parts

• Inherent filtration

• Added filtration

Inherent filtration:

Filtration resulting from the absorption of X-rays as they pass through the X-ray tube and its housing is called Inherent filtration.

Added filtration:

Added filtration results from absorbers placed in the path of the X-ray beam. The purpose of added filtration is to remove the low-energy photons. Added filters are wedge filters and heavy metal or k-edge filters.