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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Magn Reson Med. 2011 Aug 8;67(5):1412–1418. doi: 10.1002/mrm.23105

Figure 5.

Figure 5

Simulated steady state modulation profiles as a function of the lag between the RF pulses and the periodic waveform. The alternating steady states are labeled as in Figure 2. Insets show the waveform used in simulation at three values of the lag relative to the first RF pulse (at time =0). The boxcar approximation of the waveform shows the effective sampling of the waveform by the MASS sequence. A: lag = 0, B: lag = π /4, C: lag = π/2. Note that the increase in lag affects the central peak that is most sensitive to the Nyquist (maximum) frequency of the waveform, but the side peaks are not affected much. Gray-shaded area is the off-resonance region insensitive to the lag, and can be used for MASS imaging by selecting phase cycling step of ~90 deg.