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Chapter 10
SWGTC-R/T-Chapter 10-Wallace-Methods to Control Scatter
| Question | Answer |
|---|---|
| more matter= more _________ | scatter |
| true/false> the x-ray beam should never be larger than the size of the film | true |
| a change in collimation size affect both ________and ________. | density and contrast |
| true/false> a filter absorbs low energy photons from the x-ray beam and reduces patient radiation dose. | true |
| filtration has an affect on both _______ and ______as it has an effect on the quantity and quality of the x-ray beam. | contrast and density |
| filtration <decreases/increases> density and contrast | decreases |
| What are the two types of filtration? | inherent and added |
| this type of filtration is part of the tube and can not be eliminated. hat is it and how does it work. | inherent. the window of the tube acts to filter some of the photons from the beam. |
| this type of filter is placed under the window between the tube and the collimator. what is it and hat is it usually made of? | added filtration, made of metal, usually aluminum |
| true/false>by law, added filtration is now included in every x-ray tube and is not removable. | true |
| 2 shapes of compensatory filters placed in a track under the collimator | wedge and trough |
| The wedge filter has a thick end and a thin end. The smaller part of the patient should be placed under the ________end. | thick |
| What is the purpose of the wedge filter? | used to give uniform density when the body part being examined is thicker on one end than the other. |
| this type of compensatory filter is thicker on its edges and thin in the middle. | trough |
| What are the best method to control scatter? | grids and collimator |
| What is contained in the back of a cassette? | lead |
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kristinalyn
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