PURE Cosine Arbitrary Phase with sine and cosine

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Presentation transcript:

PURE Cosine Arbitrary Phase with sine and cosine Mostly a negative of cosine Negative cosine and negative sine

Cosine F.T. fC cos + fS sin Sine Cosine Sine Cosine Sine Cosine Subtract out the sine component F.T. Sine Cosine Sine Cosine Sine Cosine Such requirements as subtracting a sine component from the magnetization can be effected by appropriate pulse widths and phases at the required time.

Solenoidal sample coil axis Z Pulse applied In XY plane precessing magnetization Y Solenoidal sample coil axis Axis- Y Y Precessing magnetization induces rf voltage: NMR signal X Z When relaxation process is effective, the relaxation leads to the decay of the transverse magnetization of XY plane The above picture is for time scales small compared to relaxation time T2 This decay of magnetization due to the transverse relaxation time is because of the defocusing of the magnetization isochromats in XY plane