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Chapter 2
Compensating Filters
Question | Answer |
---|---|
Compensating filter | |
Three radiographic exams that would benefit from use of compensating filters | AP projection of the thoracic spine Axiolateral projection of the hip (Danelius Miller method) Axiiolateral projection of the lateral cervicothoracic region (Swimmer's technique) |
Common filter shape | Wedge |
Common filter material | Aluminium Plastic Pb |
Two types of filters | Collimator-mounted filter Contact filter |
Placement of Contact filter | Directly on patient or between IR and anatomy |
Where is Wedge filter used? | Where tissue density varies gradually along the long axis (AP projection of the thoracic spine) |
Where is trough filter used? | Where the subject density in the center is much greater than at the edges (PA projection of the chest) |
Where is Ferlic swimmer's filter used? | |
Boomerang filter | Contact filter that conform to the shape of the shoulder. |
Scoliosis filters |