Images illustrate the contour and thresholding technique Images illustrate the contour and thresholding technique.A, Parasagittal 3D T1-weighted MR image of the brain with the brain contour.B, Transverse 3D T1-weighted MR image of the brain showing the initial ventricular contour.C, Binary image of the correspond... Images illustrate the contour and thresholding technique.A, Parasagittal 3D T1-weighted MR image of the brain with the brain contour.B, Transverse 3D T1-weighted MR image of the brain showing the initial ventricular contour.C, Binary image of the corresponding sections of the brain.D, Final binary image of the ventricles. Angela Oatridge et al. AJNR Am J Neuroradiol 2002;23:19-26 ©2002 by American Society of Neuroradiology