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\usepackage{mathtools}  \subsection{Method 2}  As understood from the previous method that it may be quick but the veins mask thus generated is not of the best quality. The second 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 are the magnitude volume and phase volume of the MR images \cite{16398421}. Generally complex MR image acquisition can be expressed as:   \begin{math}  I = |I|*exp(\verb|\phi|) |I|*exp(\phi)  \end{math}  Magnetic resonance (MR) phase images often contain useful