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9 Cards in this Set
- Front
- Back
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The ability to differentiate small differences in density on the image.
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Contrast
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What differences in density do tissues need to have to be differentiated in CT?
Xray? |
1. .5%
2. 10% |
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Does windowing the image affect the actual contrast between densities?
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No
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A measurement of the smallest structure that we can visualize or resolve in an image?
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Resolution
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What is line pairs referring to?
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The resolution of a CT scanner
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A condition in an image that refers to electronic intereference that causes the image to be grainy
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Noise
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Do scan parameters directly affect the amount of noise in an image and Why?
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No, but by varying the amount of photons (increasing) noise will be less apparent
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The scan parameter which is the mathematical product of the tube current and the rotation time and which determines the number of photons the patient's body is exposed to.
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mAs
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How does increasing the mAs affect noise and patient dose?
Contrast and Resolution? |
Decreases noise and increases patient dose
Both Contrast and Resolution go unchanged. |
