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Describe the general appearance of visual noise
in clinical images.
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When looking at clinical images recognize visual
noise.
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Give at least two alternate names for visual
noise in clinical images.
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Briefly describe the two major sources of visual
noise in radiographic images.
-
Describe and illustrate the general random nature
of x-ray photons.
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Explain how the random distribution of x-ray
photons produces image noise.
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Draw a simple graph showing the distribution of
x-ray photons and explained the concept of standard deviation.
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Describe the relationship of standard deviation
to the mean or average number of photons.
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Describe the relationship of quantum noise to
x-ray receptor exposure.
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Briefly describe the concept of the quantum sink.
-
Describe the disadvantage of using radiographic
receptors with very high sensitivity or speeds.
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Explain why quantum noise might be more of a
problem with digital radiography than with film screen radiography.
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Describe the general relationship of image noise
to image detail.
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Explain in general terms how blurring reduces
image noise.
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Describe the relationship between digital image
pixel size and noise.
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Briefly describe how digital image processing can
be used to reduce image noise and where it is used clinically.
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Briefly describe how the process of averaging a
series of images can be used to reduce noise and where it is used clinically.
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Explain why image display contrast has an
effect on the visibility of noise.
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Observe the effect of changing digital display
window width on the visibility of noise in both digital radiography and CT.
