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34 Cards in this Set
- Front
- Back
Selection of the incorrect body part from the examination menu may result in _____
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image misinterpretation
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kilovoltage peak should be chosen ____
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for the type and amount of contrast desired
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the k-edge of phosphor imaging plates ranges from ____ keV
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30 to 50
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the range of kilovoltage peak that can be used with CR is ____ KVp
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45 to 120
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True or False: less kilovoltage peak is needed with conventional radiographic screens than is necessary for CR systems
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False
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mas is selected for the _____
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number of electrons needed
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when insufficient light is produced by the imaging plate phosphor, the image will _____
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be grainy
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quantum mottle is caused by ____
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insufficient light
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True or False: backscatter from the cassette-detector influences the amount of mAs necessary to produce the image
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True
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using an imaging plate that is much larger than the part being examined will ______ resolution
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decrease
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True or False: using the wrong imaging plate size may result in a matrix with very small pixels
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False
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the higher the number of pixels in a matrix, the _______ the image resolution
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higher
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true or False: grid lines projected onto the imaging plate will not interfere with the image
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False
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the moire artifact results when grid lines and scanning lasers are ______
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parallel
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Grid use for CR examinations is more critical than in film/screen radiography because CR _____
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imaging plates record more densities
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the number of grid lines per centimeter or lines per inch describes grid ____
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frequency
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Grid ratio describes the ____
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relationship between the height of the lead strips to the interspace
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which of the following requires more critical beam centering?
-parallel grids -focused grids -low-ration grids -low-frequency girds |
focused grids
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collimation to a smaller area _____
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decreases compton interactions
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true or False: it is acceptable to replace collimation with shuttering
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false
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True or False: images should be marked only with computerized markers
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False
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the exposure indicator number for Fuji systems is the ____ number
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S
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the exposure indicator number is an _____
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indication of radiation absorbed by the imaging plate
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true or False: with Fuji exposure indicators, the lower the S number, the higher the exposure
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true
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What manufacturer uses exposure indicator numbers in the thousands?
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Kodak
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As kodak exposure indicator numbers increase by 300, exposure
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increases by a factor of 2
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an S number of 400 in a Fuji system ____ an S number of 2000
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is half the exposure of
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in a Fuji system, each change of exposure number of 200 is equal to a change by a factor of ___
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2
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in a ll systems, exposures outside the range indicate ____
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both overexposure and underexposure
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a histogram is____
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a graphic representation of x-ray exposure
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dark line artifacts can be caused by ____
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scatter through the back of the cassette
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horizontal white lines may be caused by ____
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dirt on the light guide in the reader
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to avoid the moire grid artifact, the grid must be oriented ____ to the plate readers laser scan direction
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perpendicular
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fine white lines appearing on a hard copy of the image may be caused by _____
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debris on the mirror in the laser printer
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