Patent ID: 6304632
Filing Date: 2001-10-16
Classification: A61B,G21K

Abstract:
A method for improving the quality of a radiographic image of an object obtained by a radiographic X-ray unit containing an anti-diffusion grid, arranged between the object and a receiver of radiographic images, comprising the steps of displacing the grid in rectilinear translation in its plane, at the time that the image is taken, between a starting position and an ending position and according to a predetermined temporal law of displacement, wherein the law of displacement is a continuous curve exhibiting point symmetry with respect to the point whose temporal coordinate is equal to one-half of the duration of imaging, and whose spatial derivative of the temporal variable exhibits two portions symmetrical with respect to an axis of symmetry passing through the center of the area of displacement of the grid, and displacing the grid according to the law of displacement at a high rate of displacement in the vicinity of the starting position and of the ending position.