Distribution Metrics and Image Segmentation. Left: Initialization of information based active contour on CT bone image. Right: Active contour captures bone. Read more ...
April 2008
Featured Image: Diffusion tensor analysis with invariant gradients and rotation tangents. Guided by empirically established connections between clinically important tissue properties and diffusion tensor parameters, we introduce a framework for decomposing variations in diffusion tensors into changes in shape and orientation. Read more ...
March 2008
Global Medical Shape Analysis Using the Laplace-Beltrami Spectrum. In this paper we develop a new algorithm to analyze shape changes globally, going beyond volume changes, based on the Laplace-Beltrami surface spectrum. While it does not afford local analysis, the method allows for shape comparisons with minimal preprocessing. In particular, no prior shape alignment is required. Read more ...
December 2007
Outlier Rejection for Diffusion Weighted Imaging. Outliers for a given gradient direction are assumed to show values inconsistent with the values of neighboring gradient directions (a). This could either be unusually large (b) or unusually small image intensities (c). The extreme example on the right (c) shows large signal drops for complete image slices. Since the method operates on a voxel by voxel basis, outliers may be detected and corrected for complete slices, but also for more confined, localized patches. Read more ...
October 2007
A volumetric approach to quantifying region-to-region white matter connectivity. The paper presents a volumetric approach for quantitatively studying white matter connectivity from diffusion tensor magnetic resonance imaging (DT-MRI). Volumetric pathways for several tracts are displayed. Read more ...
August 2007
Occipital lobe gray matter volume in male patients with chronic schizophrenia. Schizophrenia is characterized by deficits in cognition as well as visual perception. There have been studies of the occipital lobe as an anatomically defined region of interest in schizophrenia. To examine whether or not patients with chronic schizophrenia show occipital lobe volume abnormalities, we measured gray matter volumes for both the primary visual area (PVA) and the visual association areas (VAA). Read more ...
July 2007
Cortical surface shape analysis. Estimated folding development speed of the regions that develop the fastest during age 0-33 weeks (first row), 33-38 weeks (second row), and 38 weeks and older (third row). Colormap encodes the magnitude of the estimated development speed. Read more ...
June 2007
Multiscale 3-D shape representation and segmentation using spherical wavelet. This image shows the location of the caudate nucleus (top) and the variability observed (bottom). Read more ...
