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. Author manuscript; available in PMC: 2016 Jan 30.
Published in final edited form as: Magn Reson Med. 2014 Jul 30;74(1):162–174. doi: 10.1002/mrm.25393

Fig. 7.

Fig. 7

Off-resonance correction (ORC) by the conjugate phase algorithm: (a) without ORC, (b–d) with ORC at a time step of 0.5, 0.1 or 0.002 periods of frequency bandwidth (BW), (e) intensity profiles along the red line in (a), and (f) a masked B0-field map for the ORC. A smaller time step produced better ORC (arrows in a–e). The time step of 0.1/BW (or 0.5ms or 50 data points) was as good as the time step of 0.002/BW (0.01ms or 1 data point) for the ORC (arrow in e). (g–j) ORC (0.5ms in time step) on the tube phantom of saline water at 150mM NaCl, showing recovery of the flat intensity within the tube which has a frequency offset of −40Hz: (g) Intensity profiles along the line as shown in h, (h) image of the tube phantom before ORC, (i) image after ORC, and (j) B0-field map used for the ORC.