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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: Neuroimage. 2016 Apr 11;134:355–364. doi: 10.1016/j.neuroimage.2016.04.016

Figure 1. Simulations of SLIM and BASE-SLIM reconstruction in the presence of inhomogeneous B0 and B1 fields.

Figure 1

(A) Input B0 (bottom) and B1 (top) field maps of GM and WM used for simulations of SLIM and BASE-SLIM reconstruction. The B0 field consisted of a 1.0 μT offset and 10 μT/m gradient along the y-axis. The B1 field consisted of the transverse magnetic field generated by a 10 cm diameter surface coil located 10 cm left from the center of FOV. B0 and B1 maps are superimposed on GM (left) and WM (right) compartments.

(B) Input spectra (a) consisted of a singlet at 3 ppm for GM and at 2 ppm for WM. (b) Reconstructed spectra using SLIM without B0 and B1 corrections; (c) Reconstructed spectra with B0 correction only; and (d) those with B1 correction only. Reconstructed spectra using BASE-SLIM with both B0 and B1 corrections (e) were identical to the original input spectra (a), demonstrating effective corrections of B0 and B1 inhomogeneities. Reconstructed spectra without both B0 and B1 corrections resulted in various degrees of lineshape distortion and compartmental cross-contamination due to B0 and B1 inhomogeneities.