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. Author manuscript; available in PMC: 2020 Feb 1.
Published in final edited form as: Magn Reson Med. 2018 Oct 4;81(2):1229–1236. doi: 10.1002/mrm.27410

FIG. 1.

FIG. 1

Intermediate maps for generating QSM from the DICOM files exported from the MR scanner. A nonlinear least squares fitting algorithm is used to estimate frequency map (a) which is then unwrapped with quality-guided phase unwrapping to obtain (b) from which the background field is removed using LBV to obtain the local field map (c). A magnitude image (d) is generated from the DICOM files using sum-of-squares summation and its forward gradient is computed to obtain the weighting matrix (e). All these maps serve as input to the MEDI+0 algorithm which generates the final QSM map (f).