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RADT456
Image Production and Evaluation
| Question | Answer |
|---|---|
| What is one effect of decreasing kilovoltage? | Decrease in optical density |
| Film sensitivity must be matched to what in relation to spectral matching? | Proper color screen fluoroescence |
| What term identifies a reduction in x-ray photon intensity as the photon passes through material? | Attenuation |
| Where is focal spot blur the greatest? | At the cathode end of the x-ray tube |
| What is absorption of useful radiation by a grid called? | Grid cutoff |
| The electron travels which direction in an x-ray tube? | Cathode to anode |
| As intensifying screen speed increases, how is radiographic density affected? | It increases |
| What is the purpose of the automatic processor's transport system? | To move the film and change its direction. |
| What material is film base currently made of? | Polyester |
| In chest radiography, why is it necessary to use the shortest exposure time possible? | To minimize involuntary motion |
| How is SID related to density and exposure rate? | An increase in SID results in a decrease in exposure rate and density. |
| If a fast screen-film is used with a slow screen-film system, the resulting image appears how? | Too light |
| What does foreshortening of anatomic structure mean? | The structure appears smaller than its actual size on the IR. |
| What term is used to describe the unsharp edges of tiny radiographic details? | Geometric blur |
| What happens to contrast scale as grid ratio is decreased? | It becomes longer. |
| What chemical is used in the production of radiographic film emulsion? | Silver halide |
| What has the greatest effect on radiographic density: aluminum filtration, kilovoltage, SID, or scattered radiation? | SID |
| The line-focus principle expresses the relationship between what? | Actual and effective focal spot |
| What is a compensating filter used for? | To even out tissues with varying densities and thicknesses. |
| Silver halide crystals that have been exposed are changed to black metallic silver by what? | Reducer |
| What term is used to describe the continued emission of light by a phosphor after the activating source has ceased? | phosphorescence |
| Grid cutoff because of off-centering results in what? | Overall density loss |
| What device requires two exposures to evaluate focal-spot accuarcy? | Slit camera |
| The height of the grid's lead strips and the distance between them is referred to as what? | Grid ratio |
| How is spatial resolution measured in traditional radiography? | Line pairs per millimeter, lp/mm |
| Using the anode heel effect, does the intensity of the beam increase more at the cathode end or the anode end? | Cathode |
| How is OID related to recorded detail? | Inversely |
| What is the reciprocity law? | It states that regardless of the combination of mA and exposure time used, as long as the mAs remains the same, the radiographic density will be the same for each exposure. |
| What is the purpose of a grid and how does it affect patient dose? | To absorb scatter radiation that would otherwise cause fog on the radiograph. It increases patient dose. |
| What are some characteristics of the photoelectric effect? | Low-energy photon, deposits all of its energy in an inner-shell electron and ejects that K shell electron. |
Created by:
cindymmc42812
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