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\section{Image Processing Methods}  The Image processing methods consist of few pre-processing steps. Generally the volumetric magnitude image is used for masking the ROI in the phase volume. In order to do that a standard brain extraction(FSL BET) is performed and also a binary brain mask is generated. The extracted brain thus obtained is further co-registered with the MNI standard 1mm brain using FSL FLIRT and the corresponding  forward and inverse transformation matrix are generated for projecting analysed veinous masks to and fro the subject space and standard space.  \subsection{Method 1} 2}  This image processing method considers only the magnitude volume of SW images. This method is not perfect, but this gives a 'quick and dirty' way of looking into the distribution of veins in a particular ROI. The extracted magnitude brain does show the veinous arrangements but it is dificult to segment it out, because  the veins appear black in the magnitude image with not so good contrast with surrounding tissues.   \begin{itemize}  \item Processing Step 1:  \end{itemize}