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31 Cards in this Set
- Front
- Back
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Recorded detail is
-the degree of geometric sharpness -definition -the accuracy of the structural lines actually recorded in the radiographic image -all of the above |
All of the above
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The unit of resolution is
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line pairs per millimeter
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Poor resolution is caused by unacceptable levels of
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penumbra
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Which of the following can obscure detail?
-small focal spot size -good film/screen contact -motion -minimal OID |
Motion
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Factors affecting recorded detail include
-KVp -grids -mA -focal spot size |
focal spot size
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Resolution is improved when
-OID increases -OID decreases -SID decreases -none of the above |
OID decreases
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Resolution is improved when
-OID increases -SID increases -SID decreases -none of the above |
SID increases
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Which method will produce the best resolution?
-using a cardboard holder -tabletop work -bucky tray work -portable grid work |
using a cardboard holder
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Which radiograph will exhibit the best detail?
-a PA chest radiograph for evalutaion of the heart at 40" -a PA chest radiograph for evaluation of the heart at 72" -an AP chest radiograph for evaluation of the heart at 40" -an AP chest radiograph for evaluation of the heart at 72" |
A PA chest for evaluation of the heart at 72"
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As focal spot size decreases
-umbra is improved -penumbra decreases -resolution increases -all of the above |
All of the above
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Penumbra decreases as
-focal spot decreases -OID decreases -SID increases -All of the above |
All of the above
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Slow film screen combinations will
-increase resolution -decrease density -decrease patient dose -all of the above |
Increase resolution
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Resolution will increase as ____ increases
-Phosphor size -phosphor layer thickness - phosphor concentration -all of the above |
phosphor concentration
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The best method for controlling motion when the patient is unable to cooperate is to
-increase KVp -maintain mAs, while decreasing time -maintain mAs, while decreasing mA -decrease KVp |
maintain mAs, while decreasing time
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Distortion is a misrepresentation of
-size only -shape only -size and shape -detail |
size and shape
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Size distortion in radiography can be ___ only
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magnification
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Size distortion is controlled by what?
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SID, OID, & radiographic distances
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As size distortion decreases, the resolution of recorded detail _____
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Increases
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The ____ the SID, the _____ the magnification
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greater, smaller or smaller, greater
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Which examination will not exhibit an inherently large OID?
-AP lumbar spine -lateral cervical spine -lateral chest -AP facial bones |
AP lumbar spine
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As OID increases and SID remains constant, entrance skin exposure____
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Increases
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Large patients receive greater exposure than small patients because their _______
-SOD is decreased -OID is increased -entrance skin surface is closer to the source -all of the above |
all of the above
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Which occurs when the tube or image receptor is not properly aligned?
-elongation -magnification -foreshortening -minification |
elongation
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Which occurs when the part is improperly aligned?
-elongation -magnification -foreshortening -all of the above |
foreshortening
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Proper alignment is achieved when the central ray is _____ to the part and _____ to the image receptor
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Perpendicular, perpendicular
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When the patient position is reversed, the direction of the tube angle must be ____ to maintain the relationship
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reversed
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Quantum mottle is corrected only by increasing what?
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mAs
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Involuntary motion is best controlled by what?
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decreased exposure time
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When imaging an AP abdomen, anatomical structures that are farthest from the image receptor will demonstrate what form of distortion?
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Magnification
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The long axis of the anatomical part is intended to be positioned _____ to the central ray and ____ to the image receptor.
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perpendicular, parallel
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What factor is used to cause a controlled shape distortion?
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Angulation
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