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I = |I|*exp(\phi)  \]  where \(|I|\) is the magnitude part and \(\phi\) is the phase component of the image. The phase image conveys several important information like field inhomogeniety, venous blood flow etc. But extracting the phase image from the measured complex image is non-trivial, because the any phase component beyond the range of \(-\pi, \pi\)$ \(-(\pi, \pi]\)  is wrapped back into the principal value range. This method consists of the following steps.  \begin{itemize}