Sushma S. Trivedi

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The general nature of postreconstruction beam hardening correction methods is discussed. A methodology for choosing the energy of reconstruction is presented based on a technique of evaluating the "nearness" of two projection data sets. Two previously published postreconstruction beam hardening correction methods are described within a common framework.(More)
A general framework for the interactive display and manipulation of the three-dimensional binary scenes is discussed. The procedures for obtaining the shaded graphics display, specification of a secondary object to be used in the manipulative operations of union, subtraction and intersection are described. The methods are illustrated using real medical data(More)
Using an open chest canine model, a method was developed for three-dimensional reconstruction of the contracting left ventricle from two-dimensional echocardiograms, which is applicable to intraoperative studies in humans. A mechanically held 5 MHz transducer was used to record parallel high resolution cross-sectional images with precise spatial(More)
Consider a three-dimensional "scene" in which a density f(x, y, z) is assigned to every point (x, y, z). In a discretized version of the scene the density D(i, j, k) assigned to the (i, j, k) th volume element (voxel) is the average value of f(x, y, z) over the voxel. Suppose that the points in the original scene can be meaningfully segmented into classes(More)
This paper describes the methods for presenting (i) scores obtained by a subject in neuropsychologic tests as a map of the brain by assigning the various scores to those regions or areas of the brain where the specific function is supposed to be localized and (ii) similar maps of the regional cerebral blood flow measured by the extra-cranial detectors. The(More)
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