Which techniques utilize the EM spectrum?
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all of them except for ultrasound
What is an artifact?
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an image feature that does not represent valid anatomical structure or
functional objects
What is overflow artifacting?
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overflow artifacts cause a nonuniform, washed-out image due to dynamic
range issues (too much gain); MRI
What is a line impulse?
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it is a bunch of point impulses on a line (continuous delta)
What is depth dependent magnification?
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objects closer to the source will appear larger; projection issue/artifact
Tomographic
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taking a slice of an organ
What is specificity?
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, true negative fraction: fraction without the disease that the image
diagnoses as normal
What is the Ram Lak filter?
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a square window on the filter
What does an optical technique do?
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uses light or near visible frequencies to image cells and tissues
Functional technique
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shows function of the body
What is bias?
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, systematic, reproducible differences from truth
What controls the spacing in the sampling function?
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∆x and ∆y
How do you find the magnitude of the Fourier transform?
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sqrt(R^2 + I^2)
What does a point impulse tell you?
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it good for characterizing a point source which shows how much a point is
spread, which can be used for resolution purposes
What is EM radiation?
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all of them except for ultrasound
What is an artifact?
Give this one a try later!
an image feature that does not represent valid anatomical structure or
functional objects
What is overflow artifacting?
,Give this one a try later!
overflow artifacts cause a nonuniform, washed-out image due to dynamic
range issues (too much gain); MRI
What is a line impulse?
Give this one a try later!
it is a bunch of point impulses on a line (continuous delta)
What is depth dependent magnification?
Give this one a try later!
objects closer to the source will appear larger; projection issue/artifact
Tomographic
Give this one a try later!
taking a slice of an organ
What is specificity?
Give this one a try later!
, true negative fraction: fraction without the disease that the image
diagnoses as normal
What is the Ram Lak filter?
Give this one a try later!
a square window on the filter
What does an optical technique do?
Give this one a try later!
uses light or near visible frequencies to image cells and tissues
Functional technique
Give this one a try later!
shows function of the body
What is bias?
Give this one a try later!
, systematic, reproducible differences from truth
What controls the spacing in the sampling function?
Give this one a try later!
∆x and ∆y
How do you find the magnitude of the Fourier transform?
Give this one a try later!
sqrt(R^2 + I^2)
What does a point impulse tell you?
Give this one a try later!
it good for characterizing a point source which shows how much a point is
spread, which can be used for resolution purposes
What is EM radiation?
Give this one a try later!
