A gradient descent image registration method
A. ) is generally always of the affine registration type.
B. ) will eventually find a correct answer but it might take a large amount of time.
C. ) will continue to change parameters in a given direction while the objective function is decreasing.
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When performing image registration, an objective function
A. ) measures the modality of an image.
B. ) gives a measure of the similarity between two overlaid images.
C. ) describes the co-ordinate system between two images.
Data towards the edge of k-space is
A. ) more intense.
B. ) representative of higher frequency responses relative to that at the centre.
C. ) representative of lower frequency responses relative to that at the centre.
The Fourier transform is important in MRI because
A. ) it is used to make images from k-space data.
B. ) it is a fundamental part of the mathematics of the signal acquisition.
C. ) because k-space data needs to be rectangular not circular.
Functional MRI allows us to visualize cognitive processes as they occur in the brain by:
A. ) measuring currents in neurons within the brain
B. ) imaging the blood flowing into the brain
C. ) imaging local changes in brain tissue signal as the blood oxygenation level changes with flow
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