(Problem 10.4) Consider the excitation of a slice of thickness A2 = 4 mm, by a bandlimited rf pulse on for a time duration Tn. = 4 ms. Assume that the flip angles of the spins are dominated by the exact (time) center of the rf pulse. If the applied gradient strength is given as 10 mTlm: b) How long must the rephasing gradient be applied, for complete refocusing, if Gnaplme = G and the two gradients are boxcar pulses? c) What is the duration of the total slice select process, including the time that both G55 and G are applied? 55 rephase