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. Author manuscript; available in PMC: 2022 May 1.
Published in final edited form as: Magn Reson Imaging. 2021 Feb 4;78:7–17. doi: 10.1016/j.mri.2021.01.004

Figure 1:

Figure 1:

The diagram of 3D T1 weighted (T1w) turbo spin echo (TSE) sequence with a variable flip angle (VFA) refocusing pulse train design. (A) 3D T1w TSE sequence with VFA refocusing pulse trains, anti-drive and adiabatic spectral fat suppression. (B) Desired lowpass filtering profiles with different cutoff frequencies to be used as signal evolution curves of the reference tissue in extended phase graph (EPG) algorithm. The cutoff value of 1.0 refers to the point spread function (PSF) priority VFA design method, and the others are for signal-to-noise ratio (SNR) priority VFA design method. (C) The corresponding VFA refocusing pulse trains converted by EPG algorithm. (D) The TSE steady state echo signal curves for different VFA pulse trains generated by Bloch simulation after 30 repetition cycles. Note that SNR priority VFA design offer much higher echo signals during the first half echo train acquisition compared to PSF priority VFA design.