题目内容

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.

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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.

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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.

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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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The Gadolinium contrast agent is used to delineate tumors because it:

A. ) increases the T2 relaxation time of fluid in the tumor
B. ) accumulates in highly vascular tissue and shortens the T1 relaxation time of tissue
C. ) targets and destroys cancer cells

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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

The Fourier transform is important in MRI because

Functional MRI allows us to visualize cognitive processes as they occur in the brain by:

The Gadolinium contrast agent is used to delineate tumors because it:

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.