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29 Cards in this Set
- Front
- Back
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OPACITY |
Description of the appearance of the radiograph |
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Objects that allow many x rays are... |
Black |
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Objects that do not allow many x rays are... |
White |
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Radiopaque are.. |
WHITE areas |
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Radiolucent are... |
Dark areas |
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From radiolucent to radiopaque... |
1-Air 2-Fat 3-Water-muscle 4-Bone 5-Metal |
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Can the kVp-penetration of x ray affect the density of the film? |
Yes |
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Bone and metal, high or low density? |
HIGH |
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High density objects absorb MORE x rays |
TRUE |
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"The opacity difference between the adjacent areas on a radiograph" is called |
CONTRAST |
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What are the 2 types of contrast? |
-Radiographic -Subject |
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Bone with a black background is an example of... |
Radiographic contrast |
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Radiographic contrast is obtained by setting low mAs and HIGH kVp...true or false? |
TRUE |
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Development time, kVp, and composition of the subject affect contrast, what else? |
Also scatter radiation |
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The difference of 2 anatomic structures is called |
SUBJECT contrast |
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Subject contrast depends on kVp and mAs, what are they? |
-kVp = PENETRATION of x ray beam
-mAs = QUANTITY of x rays |
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Low kVp, not enough x rays. How is the film? |
Washed out |
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What could happen is kVp is too high? |
Scatter radiation |
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Why are bones white on an x ray? |
Photoelectronic absorption |
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x ray photon is deflected from the atom, like a billiard ball after it hits another ball. This is... |
Compton scattering |
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What can you use to reduce scatter radiation? |
-Collimators -Diaphgrams -Cones -Filters -Grids |
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Grids decrease scatter radiation, true or false? |
FALSE! they prevent scatter radiation from hitting the film |
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Types of grids? |
-Parallel -small fields -Linear -Crisscross -Focused -Unfocused |
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A mechanical beam that can be moved across at a consistent speed is... |
POTTER BUCKY DIAPHRAGM |
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When the subject is not parallel to the cassette it can cause... |
Distortion |
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Subject not too close or parallel to the cassette... |
Magnification |
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Elongation |
Subject not directly under x ray beam |
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Foreshortening |
One side is not parallel to the other. |
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Most common screen used in vet medicine |
400 SPEED |
