题目内容

According the Bloch equation for Z-magnetization, the rate of change of Z-magnetization is:

A. ) equal to T1.
B. ) proportional to T1.
C. ) inversely proportional to T1.

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Longitudinal relaxation generally occurs:

A. ) faster than transverse relaxation.
B. ) slower than transverse relaxation.
C. ) the same as transverse relaxation.

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In a 90 – tau – 180 – tau spin echo sequence, the time between the 90 degree excitation pulse and the spin echo maximum is called:

A. ) tau.
B. ) Echo time.
C. ) 180 pulse.

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A 90 degree pulse aligned along the X-axis is applied creating transverse magnetization. In the rotating frame of reference, if a 180 degree pulse aligned along the X-axis is then applied after a time tau, the vectors will rotate:

A. ) 180 degrees around the X-axis.
B. ) 180 degrees around the Y-axis.
C. ) 180 degrees around the Z-axis.

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When the spin vectors in the transverse plane have completely randomized due to dephasing:

A. a) the net magnetization is zero within the transverse plane.
B. b) the net magnetization is increased within the transverse plane.
C. c) the net magnetization remains unchanged.

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According the Bloch equation for Z-magnetization, the rate of change of Z-magnetization is:

A. ) equal to T1. B. ) proportional to T1. C. ) inversely proportional to T1.

Longitudinal relaxation generally occurs:

In a 90 – tau – 180 – tau spin echo sequence, the time between the 90 degree excitation pulse and the spin echo maximum is called:

A 90 degree pulse aligned along the X-axis is applied creating transverse magnetization. In the rotating frame of reference, if a 180 degree pulse aligned along the X-axis is then applied after a time tau, the vectors will rotate:

When the spin vectors in the transverse plane have completely randomized due to dephasing:

A. ) equal to T1.
B. ) proportional to T1.
C. ) inversely proportional to T1.