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Radt 456
ARRT registry review covering image acquisition and evaluation
| Question | Answer |
|---|---|
| List two types of distortion | Size (magnification) Shape (elongation/foreshortening) |
| What measurement is used to express recorded detail? | lp/mm |
| What will an increase in OID do to magnification? | Increase it |
| What type of relationship does focal spot size have with recorded detail? | Inverse |
| List two ways to minimize voluntary motion | Good communication Suspend respiration |
| List three ways to minimize involuntary motion | Short exposure time Support and stabilization Immobilization devices |
| What happens to recorded detail as phospher size increases? | Decreases |
| What is the term form luminescence that lingers after x-ray is terminated? | Afterglow |
| What type of relationship does mAs have with density? | Direct |
| What type of relationship does kVp have with contrast | Inverse |
| What is the conversion factor for an 8:1 grid? | 4 |
| How much of a change in mAs is necessary to create a noticeable change in density? | 30% |
| What is the primary goal of filtration? | reduce patient dose |
| What is grid frequency? | Number of lead strips per inch |
| Anode heel effect creates greater intensity at which end of the beam? | Cathode |
| What happens to optical density as developer temperature increases? | Increases |
| High contrast is what type of scale? | Short |
| What does short scale contrast do to film latitude? | Decreases it |
| What type of relationship does kVp have with scatter radiation? | Direct |
| What is the primary function of a grid? | Absorbs scatter radiation before it reaches IR |
| Base plus fog should account for no more than this much density | 0.2 |
| Name the two types of AEC's | Phototimer and Ionization Chamber |
| What type of relationship does SID have with magnification? | Inverse |
| What effect does an increase in focal spot size have on recorded detail? | Decreases it |
| List three rare earth phosphers | Gadolinium, Lanthanum and Yttrium |
| A phosphor's ability to absorb x-ray energy and convert it to fluorescent light energy is known as what? | Conversion efficiency |
| What effect does the use of an intensifying screen have on patient dose? | Decreases it |
| What term describes the amount of blackness on an image? | Density |
| As thickness and density of a tissue increases, what happens to the production of scattered radiation? | Increases |
| Additive type disease processes will cause what effect on density? | Decrease it |
Created by:
jaminton
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