Fig. 3.

The predicted excitation profile of WE techniques from the numerical simulation. The excitation profiles of frequency are plotted with their chemical shift scales referring to the water resonance frequency, and the x-axis is taken as the absolute coordinate of the chemical group. The magnitudes of the transverse magnetization (a) are displayed as the excitation profiles of WE techniques in the types of [26] (green line), {1-2-1} (red line) and {1-3-3-1} (blue line). The excitation profile is shifted with the field inhomogeneity, where three values of ΔB₀ (−100, −50, 0 50, and 100 Hz) are used to simulate the excitation profiles of WE in the type of {1-3-3-1} (b). The real part (read line) and imaginary part (green line) of transverse magnetization show the phase response of the WE in the type of {1-3-3-1} (c)