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. Author manuscript; available in PMC: 2014 Apr 1.
Published in final edited form as: Magn Reson Med. 2012 May 24;69(4):1044–1055. doi: 10.1002/mrm.24340

Figure 4.

Figure 4

Simulated echo signals for 1-pentene with 180° (perfect; black) pulses, 175° pulses (blue), and 170° pulses (red). RF inhomogeneity causes stimulated echoes, which alter the echo signal differently for CPMG and UDD. The different x-axis timescales for CPMG and UDD should be noted, which results from the shorter final UDD delay. The subtraction UDD – CPMG for the signal amplitude at the peak of the echo (bottom left) shows that the shorter TEs tend to favor the CPMG sequence, while the UDD sequence is favored at the longer TEs. This is also reflected in the image, normalized to the CPMG signal (bottom right). Even minor (<10%) RF inhomogeneity leads to significant changes in the optimal sequence for a given TE.