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Unwrapped and filtered phase (top row), corresponding phase masks (middle row) and SWI images (bottom row) generated using different phase unwrapping followed by one minus Gaussian filtering with a filter size of 64 pixels. Specific phase unwrapping methods used were: (A) Goldstein algorithm, (B) Fourier method, (C) PRELUDE and (D) Quality-guide method. White arrows indicate inaccurate boundary values.
