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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: J Magn Reson. 2016 Apr 8;268:36–48. doi: 10.1016/j.jmr.2016.04.005

Fig. 3.

Fig. 3

Measured B0 variation with respect to a 9 cm dia., 14 cm long bottle phantom (shown in outline). The ΔB0/B0 over the bottle is about 1%. A solenoid volume coil is used for excitation and signal reception. (a) B0 maps in the 3 orthogonal planes. (b) Frequency histogram of signal inside the bottle (obtained from Fourier transforms of spin echoes) after a hard-pulse pair (80 μs and 160 μs) or a WURST pulse pair (6 ms and 3 ms, sweep width = 50 kHz). For comparison, the dotted black curve shows the calculated ground truth histogram, which is expected if all of the spins inside the bottle were perfectly excited and refocused. When WURST pulses are used for excitation and refocusing, the area of the projection is increased by 70% as compared with hard pulses. The WURST projections also better agree with the simulated ground truth projection.