Fit_ppm_complex

[emelie....@gmail.com]

Dear MEDI-users,

I try to understand how the frequency map is estimated in the function Fit_ppm_complex. I am not sure I understand how it works, is it the non-linear least square fitting to complex data (by an iterative process) as described in Appendix in Liu et al. MRM 2013;69:467-76?

Best regards,

Emelie Lind

[spince...@gmail.com]

Emelie,

That is correct. The cost function is linearized in each iteration, the resulting voxel-wise 2 by 2 inversion is implemented across all voxels using Cramer's rule.

Pascal

[Emelie Lind]

Dear Pascal,

Thank you very much! Your explanation and the paper by Liu et al. will help me understand what is done.

Thanks,

Emelie

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