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RAD456 Reg. Review

ARRT Registry Review: Image Acquisition and Evaluation

QuestionAnswer
Misalignment of the tube-part-IR relationship results in what? Shape distortion Lange Q&A pg. 179
The component of a CR image plate that records the radiologic image? Photostimulable phosphor Lange Q&A pg. 181
The process of "windowing" of digital images determines what on the image? Image contrast Lange Q&A pg. 196
What is the purpose of the thin layer of lead that is often located in the rear portion of an IP? To prevent scatter radiation fog Lange Q&A pg. 196
The purpose of the electroconductive layer of a CR PSP plate is to what? To facilitate transportation through the scanner/reader Lange Q&A pg 196
The exposure factors of 400 mA, 17 ms, and 82 kV produce a milliampere-seconds value of? 6.8 Lange Q&A pg. 197
The radiographic accessory used to measure the thickness of body parts in order to get optimal selection of exposure factors is termed what? A caliper Lange Q&A pg. 197
The x-ray image seen on the computer display monitor is what type of image? Analog image Lange Q&A pg. 197
A particular mAs value, regardless of the combination of milliamperes and time, will reproduce the same receptor exposure. This is a statement of what law? Reciprocity law Lange Q&A pg. 199
If 300 mA has been selected for a particular exposure, what exposure time would be required to produce 6 mAs? 20 ms Lange Q&A pg. 199
In digital imaging, as DEL size decrease, what happens to spatial resolution? Spatial resolution increase also Lange Q&A pg. 199
The relationship between the height of a grid's lead strips and the distance between them is referred to as grid.... ratio Lange Q&A pg. 200
A satisfactory radiograph of the abdomen was made at a 38 in. SID using 400 mA, 60 ms exposure, and 80 kV. If the distance is changed to 42 in, what new exposure time would be required? 73 ms Lange Q&A pg. 203
Why is a very short exposure time essential in chest radiography? To minimize involuntary motion Lange Q&A pg. 203
In digital imaging, TFT DEL size is related to what? Spatial resolution Lange Q&A pg. 204
A SF x-ray image made using 300 mA, 0.1 second, and 75 kV exhibits motion unsharpness but otherwise satisfactory technique. The image will be repeated using a shorter exposure time. Using 86 kV and 400 mA, what should be the new exposure time? 37 ms Lange Q&A pg. 205
When involuntary motion must be considered in SF imaging, the exposure time may be cut in half if the kV is what? Increased by 15% Lange Q&A pg. 206
Initial exposure made using 300 mA and .06 second with a 200 speed screen-film combo. An additional x-ray is requested using a 400 speed system to reduce blurriness. Using 400 mA, all other factors remaining constant, what should be the new time? 22 ms Lange Q&A pg. 206
A compensating filter is used to do what? Even out widely differing tissue densities Lange Q&A pg. 207
Boxes of film stored in too warm an area may be subject to what type of film damage? Film fog Lange Q&A pg. 207
Which interaction is responsible for producing the most x-ray photons at the x-ray tube target? Bremsstrahlung Lange Q&A pg. 207
When is x-ray film emulsion is most sensitive to safelight fog? After the exposure is made Lange Q&A pg. 208
If a 6 inch OID is introduced during an exam, what change is SID will be necessary to overcome objectionable magnification? The SID must be increased by 42 inches Lange Q&A pg. 208
If a particular grid has lead strips .40 mm thick, 4.0 mm high, and .25 mm apart, what is its grid ratio? 16:1 Lange Q&A pg. 208
The line-focus principle expresses the relationship between what? The actual and the effective focal spot Lange Q&A pg. 208
What type of pathology does a flattened hemidiaphragms and widened intercostal spaces represent? Emphysema Lange Q&A pg. 209
IRs frequently have a rear lead foil layer that functions to what? Absorb backscatter Lange Q&A pg. 209
The continued emission of light by a phosphor after the activating source has ceased is termed? Phosphorescence Lange Q&A pg. 209
How often are radiographic equipment collimators required to be evaluated? Semiannuallly Lange Q&A pg. 209
During CR imaging, the latent image present on the PSP is changed to a computerized image by the? ADC Lange Q&A pg. 209
Exposed silver halide crystals are changed to black metallic silver by what? Reducers Lange Q&A pg. 209
The exposure factors of 400 mA, 70 ms, and 78 kV were used to produce a particular image receptor exposure. A similar image could be produced using 500 mA, 90 kV, and what exposure time? In milliseconds 28 ms Lange Q&A pg. 210
If 40 mAs and a 200 speed screen-film system were used for a particular exposure, what new mAs value would be required to produce the same density if the screen-film system were changed to 800 speed? 10 mAs Lange Q&A pg. 211
An exposure was made using 8 mAs and 60 kV. If the kV was changed to 70, what new mAs value is required to maintain receptor exposure? 4 Lange Q&A pg. 211
Exposure factors of 90 kV and 3 mAs are used for a particular nongrid exposure. What should be the new mAs value if a 12:1 grid is added? 15 Lange Q&A pg. 212
Created by: jlemmons1