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engineering
electrical engineering
december 2019
07

Electrical Engineering Questions and Answers December 07, 2019

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Spins with gyromagnetic ratio y are uniformly distributed with uniform spin density po along the zaxis from 20 to zo in a 1D imaging experiment. Suppose they are excited at t 0 by an rf pulse such that the signal at that instant would be given by s(t 0) dz po 2z0p0 (9.40) A negative constant gradient field G is immediately applied at t

a) In terms of the timing and gradient parameters shown in Fig. 9.6, show that the phase during the first (negative) gradient lobe is (z, t) Gz(t t1) yAB(2)(t 27) t1

Consider the excitation of a slice of thickness Az 4 mm, by a bandlimited rf pulse on for a time duration T,f 4ms. 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 mTm a) Find the difference in accumulated phase between two spins on opposite sides

Suppose a slice select gradient G. 20 mTm is used to excite a slice which is 10 mm thick. 3D a) What is the required rf bandwidth b) If G, is reduced to 5mTm, but 7,j is unchanged, by what factor is the total number of zero crossings increased or decreased

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