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. Author manuscript; available in PMC: 2019 Feb 1.
Published in final edited form as: Magn Reson Imaging. 2017 Oct 17;46:28–39. doi: 10.1016/j.mri.2017.07.027

Fig. 3.

Fig. 3

Signal mask making examples. Intermediate steps of the mask making algorithm are shown for two cases, different sites, across nDWI and DWI images (all are NPAR scans here). Here, the nDWIs and DWIs are scaled the same within site to emphasize the SNR challenge presented by the DWIs. The ‘edges’ step shows all the edges found on the first pass; image frame (zero-values border) differences are apparent across sites and nDWI/DWI. The top row (CMH-nDWI) shows an example where a central loop edge is found. Although it is not closed, it demonstrates how it could happen. The bottom row shows an example where the outer phantom edge is incomplete at the first pass. A single application of Step 4 was sufficient to close it in this case.