题目内容

Superconducting wire is used in MRI magnet construction because:

A. ) it is stronger than copper wire.
B. ) its resistance is 0 at 0 degrees C and can carry high current.
C. ) its resistance is 0 at 4K and produces very stable magnetic fields.

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In an inversion-recovery experiment, at the null point, t0, for a tissue with a short T1 relaxation time, the tissue will:

A. ) have an observable signal, while long T1 tissue will have no signal.
B. ) have no observable signal, while long T1 tissue will have signal.
C. ) have a similar signal intensity to long T1 tissue.

Fourier Transform of the raw data with respect to the phase direction results in the representation of signal intensity as a function of:

A. ) time.
B. ) frequency.
C. ) position.

The phase gradient encodes:

A. ) the projection intensity and phase along the read gradient direction.
B. ) the projection intensity and phase along the phase gradient direction.
C. ) the phase gradient field strength at each position along the read direction.

In slice selection, for a particular slice gradient strength, a longer RF pulse time will:

A. ) select a thinner slice.
B. ) select a thicker slice.
C. ) increase the steepness of the field gradient.

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