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RADT 456: image acq

image acquistion and evaluation

QuestionAnswer
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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