Filtration Study Sheet
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Define filtration. | Process of eliminating undesirable low-energy x-ray photons by insertion of absorbing materials into the primary beam.
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| What is another name for filtration? | Hardening the beam.
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| Define filter. | Any material designed to selectively absorb photons from the x-ray beam.
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| What is the most common filter used (material): | Aluminum
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| How is filtration expressed? (2 methods) | Aluminum equivalency (Al/Eq) and Half-value layer (HVL)
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| Define half-value layer. | Amount of absorbing material that will reduce the intensity of the primary beam to one-half of its original value.
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| What are the 5 types of filtration? | Added, Compound, Compensation, Total Filtration, Inherent
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| What is total filtration? | Filtration that is equal to the sum of inherent and added filtration. (2.5mm Al Eq)
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| Define inherent filtration. | Filtration that is a result of the composition of the tube and housing.
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| Define added filtration. | Any filtration occurring outside the tube and housing and before the image receptor.
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| Materials for added filtration are selected to absorb as many ___ energy photons as possible. | Low
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| Typically _______ Al Eq is added to added filtration. | 2.0mm
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| Compound filtration uses ______ that complement one another. | two or more materials
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| What is another name for compound filters? | K-Edge filters
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| Compound filtration places the ______ compound closest to the tube. | highest
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| Give an example of compound filtration. | Thoreaus filter
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| What is the purpose of compensating filtration? | It is designed to solve a problem involving unequal subject densities.
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| What are the two most popular compensating filters? | Wedge and trough
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| How are compensating filters designed? | They are designed so that the thicker portion of the filters are matched up with the less dense parts of the body.
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Created by:
rad1958tech
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