Figure 3
From: Magnetic resonance velocity imaging derived pressure differential using control volume analysis
Region of interest segmentation. (a) Process of static ROI segmentation begins with magnitude image. (b) User defined threshold is applied creating a black and white image. (c) User manually selects desired bright region in (b) leaving the ROI of interest. (d) The perimeter pixels of the ROI are combined with original magnitude image to ensure ROI determination accuracy.