This phase unwrapping algorithm is based on the theory and c++ code from: "Two-Dimensional Phase Unwrapping, Theory, Algorithms, and Software" written by Dennis C. Ghiglia and Mark D. Pritt
This program uses weighted least-squares phase unwrapping technique (i.e. weighted Laplace unwrapping) with a solution using iterative algorithm, namely preconditioned conjugate gradient (PCG).
In order to get rid of the residual phase ambiguities after unwrapping process (which occur for all least-squares approaches) a congruence operation is applied.
In order to run this script the following files from MATLAB exchange server are required:
Barbara Dymerska (2020). PCG_unwrap_2D(ph_nii, ph_file, mask_nii, max_iter, epsi_con, N) (https://www.mathworks.com/matlabcentral/fileexchange/57666-pcg_unwrap_2d-ph_nii-ph_file-mask_nii-max_iter-epsi_con-n), MATLAB Central File Exchange. Retrieved .