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\usepackage{mathtools}  \subsection{Method 1}  This image processing method considers both the magnitude volume and the phase volume of SW images. Before the steps of processing are described its worthwhile to take a closer look at what the magnitude volume and phase volume of the MR images\cite{16398421}  actually are. are\cite{16398421}.  Generally complex MR image acquisition can be expressed as: \[  I = |I|*exp(\phi)