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21 Cards in this Set
- Front
- Back
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Which portion of the image receptor system functions to reduce the amount of exposure required to produce an image?
a) Cassette b)Intensifying screen c)Film d)grid |
B)Intensifying screen
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Which part of an intensifying screen absorbs x-ray energy and emits this energy in the form of light?
a)reflective layer b)protective coating c)phosphor layer d)adhesive layer |
c)phosphor layer
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What is the purpose of the lead foil layer in the back part of the cassette?
a)To reduc e patient dose from scatter radiation b_to protect the limited operator dose from scatter radiation c)to protect the patient and the limited operator from scatter radiation d)to prevent backscatter from foggin the image |
d)
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What term is applied to radiation that comes from the cassette back and the cassette tray and is directed toward the film?
a)quantum mottle b)backscatter c)fluorescence d)radiolucence |
B
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When comparing two intensifying screens of the same phosphor type, the screen with the smaller phsophor crystals:
a)produces greater density with a given amount of exposure b)produces a radiographic image with more recorded detail c)requires less mAs to produce a given amount of de3nsity on the image. d)produces a radiographic image with less recorded detail. |
B
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The color of light emitted by a screen phosphor is termed:
a)spectral emission b)chromatography c)phosphorescence f_fluorescence |
d
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screen speed is defined as the:
a)color of light emitted by a screeen b)ability to emit light when exposed to x-rays c)optical density minus the base plus fog value d)efficiency of a screen in converting x-rays to light |
d
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Which of the following may be caused by poor film/screen contact?
a)image blur b)lack of radiographic density c)decreased screen speed. d)static artifacts |
A
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How often should a film/screen contact test be performed?
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Quarterly
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The spectral sensitivity of the film must be matched to the:
a)filmspeed b)screen speed c)color of light emitted by the screens d)screen thickness |
c
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What is the proper method to store unopened boxes of x-ray film?
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Standing on edge
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How many times can the phosphor in the CR be used?
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10,000 times
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The advantages of using CR and DR include
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a wide dynamic range and ability to see images very fast
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What must be used with digital-based systems to ensure the ALARA concept is practed?
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An exposure technique chart
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What should be used when imaging body parts that have extreme differences in tissue density?
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A compensating filter
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What is true regarding the centering of the body part when using digital systems?
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The part must be placed in the center of the plate or detector.
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What is important to use when using digital systems for mobile radiography?
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A grid
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What is the primary purpose of studying x-ray darkroom and film processing?
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The darkroom and/or film processing can be a source of problems with image quality
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What is the purpose of the safelight filter?
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the safelight filter only permits the passage of light frequencies to which the x-ray film is least sensitive
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Which of the following are possible causes of darkroom fog on radiographs?
a)light-colored walls in the darkroom b)white light leaks) excessive developer time |
2 and 3 only
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If the darkroom safelight test indicates that film may be fogged in the darkroom during routine handling, which of the following is a possible remedy for the problem?
a)replace the safelight bulb with a bulb of lower wattage b)move the safelight closer to the film handling area c)remove the safelight filter d)paint the darkroom walls black |
A
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