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A sample is in equilibrium with a 3T static magnetic field in the +z direction. We...

A sample is in equilibrium with a 3T static magnetic field in the +z direction. We need to tip the proton magnetization vector M into the –z direction in 3 ms. (a) What should the strength of the RF excitation B1 be ? (b) How many cycles has the magnetization vector precess during the tipping process?

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