Consider a 7/2-pulse produced by a left-circular Bransmit field lying along 2 in the rotating frame....

 

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Consider a 7/2-pulse produced by a left-circular Bransmit field lying along 2 in the rotating frame. It results in the rotation of the equilibrium magnetization of a sample into the + direction at t=0 (at which time y =). (The magnetization would subsequently precess such that it remains pointed along the + direction in the rotating frame.) a) Find the phase angle do in (7.22) corresponding to this initial condition. b) Find dp for the imaging scenario where the 7/2-pulse is produced by Branamit along - (so that the magnetization is rotated into + at t= 0 and remains pointed along the +2' direction in the rotating frame thereafter). c) Repeat (b) for Bransmit along +ý'. d) Repeat (b) for Branamit along -. Consider a 7/2-pulse produced by a left-circular Bransmit field lying along 2 in the rotating frame. It results in the rotation of the equilibrium magnetization of a sample into the + direction at t=0 (at which time y =). (The magnetization would subsequently precess such that it remains pointed along the + direction in the rotating frame.) a) Find the phase angle do in (7.22) corresponding to this initial condition. b) Find dp for the imaging scenario where the 7/2-pulse is produced by Branamit along - (so that the magnetization is rotated into + at t= 0 and remains pointed along the +2' direction in the rotating frame thereafter). c) Repeat (b) for Bransmit along +ý'. d) Repeat (b) for Branamit along -.

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Solution a In order for the magnetization to be rotated into the y direction at t 0 the phase angle ... View the full answer