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Terms in this set (38)
Which imaging modality provides the greatest dynamic range?
It is a safe practice to keep CR cassettes in a "radiation safe" area of an xray suite during exams
Creating distinctly collimated margins on all 4 sides of a DR image is important in preventing _____ errors.
The moire artifact results when grid lines and scanning laser are
Which modality produces the largest image files?
Kilovoltage peak (kVp) should be chosen
for the type and amount of contrast desired
Lossy compression reduces data files
Grid ratio describes the
Relationship between the height of the lead strips to the interspace
Which of the following require more critical beam centering?
The three classifications of digital imaging artifacts are
image receptor, software, and object
_____ is done during preprocessing to correct for an irregular pattern over the image
Selection of the incorrect body part from the examination menu may result in
Horizontal white lines may be caused by
Dirt on the light guide in the plate reader
Centering an exam is especially important when
only a portion of a PSP is used for processing
Which of the following leads to increased spatial resolution?
higher mAs values
Exposure Indicators can be altered by
focal spot size, scattered radiation, and metal prosthetics
The higher the number of pixels in a matrix, the:
Higher the image resolution
Cassettes used in computed radiology are more highly sensitive to background and scatter radiation than film/screen cassettes are
Which of the following may affect the spatial resolution of an image produced with a PSP based system?
To aviod the moire grid artifact, the grid must be oriented ____ to the plate reader's laser scan direction
Grid use for CR examinations is more critical than in film/screen radiolography because CR
imaging plates record less scatter
Although filtration in the xray equipment removes some xrays of every type, filtration is primarily designed to remove xrays that are:
Quantum mottle is caused by
Object artifacts in digital imaging can occur from errors in
xray beam collimation, histogram selection, patient positioning
It is acceptable to replace collimation with shuttering
Artifacts are an acceptable part of digital imaging.
Which of the following CR will produce the most spatial resolution with the same matrix size?
14 x 14
When insufficient light is produced by the imaging plate phosphor, the image will
Grid lines projected onto the imaging plate will not interfere with the image.
Dark line artifacts can be caused by ______.
Scatter through the back of the cassette
Lossless compression reduces data files
Shuttering, a post exposure image manipulation technique is
added to the screen image
mAs is selected for the
number of electrons needed
Backscattering from the cassette/detector influences the amount of mAs necessary to create the image
A ghost image can occur in digital imaging because of _____.
An electronic menu that automatically sets kVp and mAs for a specific body part is called
To reduce the appearance of grid lines and the moire artifact, grids in digital imaging should have a high
PSP plates should be erased if they have not been used within how many hours?
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