题目内容

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.

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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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The main mechanism that contributes to T1 relaxation is:

A. ) molecular motion.
B. ) transverse dephasing.
C. ) changes in the applied field strength.

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Spin-spin relaxation is the irreversible dephasing of transverse spin vectors:

A. ) through magnetic field inhomogeneity.
B. ) through changes in echo times.
C. ) through interactions between individual spins.

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The MRI signal originates:

A. ) from the emission of energy as the spins relax from the high energy state to the low energy state
B. ) from current induced in the receive coil by net magnetization precessing in the transverse plane
C. ) from current induced in the receive coil by magnetization relaxing along the Z-axis

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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:

The main mechanism that contributes to T1 relaxation is:

Spin-spin relaxation is the irreversible dephasing of transverse spin vectors:

The MRI signal originates:

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.