Question: 10 (a) Explain why a pulse is applied at TE/2 in order to get an echo at t=TE. (b) Suppose a /2 pulse is applied

10 (a) Explain why a pulse is applied at TE/2 in order to get an echo at t=TE. (b) Suppose a /2 pulse is applied to a sample at t=0, and a sequence of pulses is applied to the sample at t=22k+1TE,k=0,1,. If TE is small compared with T2, find an expression for the magnitude of Mxy(kTE) for k=1,2

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