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. Author manuscript; available in PMC: 2014 Jun 2.

Published in final edited form as: IEEE Trans Biomed Eng. 2012 Aug 23;59(12):3365–3371. doi: 10.1109/TBME.2012.2208965

Fig. 3 — FDTD human head model results at 9.4 T (400 MHz) when the 16-channel head coil is used. (a) Initial $∣ B_{1}^{+} ∣$ field distribution without optimizations. (b) Head model mask and the ROIis in the center. (c) $∣ B_{1}^{+} ∣$ result with the convex optimization (1 iteration). (d)–(f) $∣ B_{1}^{+} ∣$ results after applying 3, 9, and 12 iterations.