Figure 4:
(a) Calculated dependences of the effective field amplitude during the τSS period on x, assuming an x gradient amplitude of 25 T/m and a constant RF field amplitude within −100 μm < x < 100 μm. The RF amplitude is assumed to be zero outside this interval. Red, green, and blue curves correspond to conditions that would be used for slice selection at xS ≈ 50 μm, 0 μm, and −50 μm, respectively. The horizontal orange band indicates a range of νeff values that determines the slice width. (b) Dependence of the calculated slice width on xS, from calculations shown in panel a. (c) Calculated dependences of the effective field amplitude during the τSS period on x for conditions that would be used for slice selection at xS = 0 μm. Red, green, and blue curves correspond to gradient amplitudes of 5 T/m, 20 T/m, and 40 T/m, respectively. (d) Dependence of the inverse of the slice width on the gradient amplitude, from calculations shown in panel c.