A rectangular RF excitation pulse is used to flip the net magnetic moment vector into the transverse plane. A 60uT B1 field is used. a. A 90° flip angle is desired. Find the minimum value of the pulse length, tp to obtain the 90° flip.

A rectangular RF excitation pulse is used to flip the net magnetic moment vector into the transverse plane. A 60uT B1 field is used. a. A 90° flip angle is desired. Find the minimum value of the pulse length, tp to obtain the 90° flip.

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter21: Alternating-Current Circuits And Electromagnetic Waves

Section: Chapter Questions

Problem 72AP: (a) What capacitance will resonate with a one-turn loop of inductance 400. pH to give a radar wave...

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Question

2. A rectangular RF excitation pulse is used to flip the net magnetic moment vector
into the transverse plane. A 60µT B1 field is used.
a. A 90° flip angle is desired. Find the minimum value of the pulse length, tp to
obtain the 90° flip.
b. Now assume that a 180° flip angle is desired. Find the minimum value of the
pulse length, Tp to obtain the 180° flip.
c. Assume we are interested in using a triangular pulse at the same peak
amplitude as the rectangular pulse above (generating the same field strength
B1). What should the duration of this pulse be to obtain a 90° flip?

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