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RADT 456: image acq
image acquistion and evaluation
| Question | Answer |
|---|---|
| true/false: An increase in kVp will increase radiographic contrast. | false. it will produce more scatter and increase exposure rate. |
| What is the component of a CR image plate that records the radiologic image? | photostimulable phospor |
| Unopened boxes of radiographic film should be stored how? | away from radiation and in the vertical position. |
| Compared with a low-grid ratio, what will a high-grid ratio do? | absorb more scatter radiation and primary radiation. |
| What happens to the mAs as the flim-screen speed combination is decreased? | the mAs remains unchanged as film-screen speed decreases. |
| True/False: Radiographic contrast is a result of differential tissue absorption and emulsion characteristics. | True. |
| What is the cause of grid cut-off, when using focused reciprocating grids? | inadequate SID. |
| Using a short SID with a large IR will do what? | increase the anode heel effect. |
| A particular radiograph was produced using 12mAs and 85 kVp with a 16:1 ratio grid. The radiograph is to be repeated using an 8:1 ratio grid. What should be the new mAs value? | 8 |
| what is used to remedy the effect of very dissimilar tissue densities? | high kVp exposure factors |
| What determines the quantity of fluorescent light emitted from a flourescent screen? | thickness of the phosphor layer, type of phosphor used, phosphor size. |
| Does high kVp or low kVp permit greater latitude to the radiographer? | high kVp. |
| what is the absorption of useful radiation by a grid called? | grid cut-off. |
| What are two types of shape distortion? | elongation and foreshortening |
| What does spectral matching refer to? | the film sensitivity must be matched with the proper color screen fluorescence. |
| What is the reduction in x-ray photon intensity as the photon passes through material termed? | attenuation. |
| An unexposed and processed film will have a density of what? | 0.1 |
| Which methods help to reduce the production of scatter radiation? (compression, beam restriction, a grid) | compression and beam restriction |
| What is the function of the developer in film processing? | change the exposed silver bromide crystals to black metallic silver. |
| Where is the microswitch located for controlling the amoung of replenishment used in an automatic processor? | at the entrance roller. |
| What is used to determine the sensitivity of a particular film emulsion? | sensitometric curve |
| The process of leveling and windowing of digital images determines the image? | contrast. |
| What is a wire-mesh test used to evaluate? | contact |
| A focal-spot size of 0.3mm or smaller is essential for? | magnification radiography |
| What test requires two exposures to evaluate focal-spot accuracy? | slit camera |
| what is film emulsion having wide latitude likely to exhibit? | low contrast. |
| What will a decrease in kVp result in? | a decrease in optical density. |
| The cause of films coming from the automatic processor still damp can be what? | insufficient hardening action |
| What can reduce the quantity of scattered radiation reaching the IR? (fast imaging system, an air gap, a stationary grid) | an air gap and a stationary grid. |
| When a slow screen-film system is used with a fast screen-film AEC system, the resulting images are what? | too light |
| To produce just perceptible increase in radiographic density, the radiographer must increase what? | the mAs by 30% |
| True/False: Chemical fog is a type of exposure-type artifact. | false. |
| As grid ratio is decreased what happens to the scale of contrast? | it becomes longer. |
Created by:
kngeorgeff
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