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. Author manuscript; available in PMC: 2009 Nov 1.
Published in final edited form as: Magn Reson Med. 2008 Nov;60(5):1112–1121. doi: 10.1002/mrm.21702

FIG. 2.

FIG. 2

Modified gradient echo demonstration sequence. Following a 90° rectangular pulse (duration 1.2ms), the magnetization evolved for a fixed preparation time Tprep = 50 ms. Within Tprep, the feedback field was switched on for a duration TFB. A strong crusher gradient was applied after the TFB period to eliminate any residual net transverse magnetization, and the longitudinal magnetization was read out by a 30° slice-selective pulse and gradient echo imaging sequence. A TR of 3 seconds (≫T1 = 865 ms) was used to ensure that the longitudinal magnetization was fully recovered prior to the application of the hard 90° pulse.