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25 Cards in this Set
- Front
- Back
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two geometric properties affecting radiographic image quality |
distortion and detail |
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define distortion |
misrepresentation of the size or shape of structures being examined |
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size distortion based on _ and _ |
OID, SID |
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two types of distortion |
size (magnification), shape (elongation/foreshortening) |
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shape distrortion is based upon |
relationship of part, IR, CR |
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size distortion can be _ only |
magnification |
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size distortion is due to |
divergence of x-ray beam |
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increased SID = _ distortion because of decreased _ |
decreased, magnification |
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increased OID = _ size distortion due to increased _ |
increased, magnification |
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objects furthest away from IR will be most _ |
magnified |
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shape distortion based on |
alignment (CR, part, IR) and angulation (direct, degree) |
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size distortion based on |
OID, SID |
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shape distortion |
misrepresentation of shape of object being imaged |
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shape distortion (2) |
foreshortening, elongation |
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define foreshortening |
image of a part measuring shorter than actual part |
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foreshortening occurs with |
part angulation |
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define elongation |
refers to an image of a part measuring longer than the actual part |
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elongation occurs when |
image receptor or tube are angled |
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ideally, part and IR are _ to each other and CR is _ to both |
parallel, perpendicular |
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shape distortion occurs from (3) |
part angled, IR angled, CR angled |
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why is part angulation used |
trying to see part from a certain persepctive |
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why is tube angulation used |
for opening joint spaces, preventing superimposition, matching condyles so they look like they're on the same image |
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angulation described as |
caudad or cephalad |
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define central ray |
theoretical photon that exits from the exact center of the focal spot |
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beam divergence benefits |
PA for a lumbar spin helps open joint spaces |
