Patent ID: 6795529
Filing Date: 2004-09-21
Classification: G21K

Abstract:
A process for producing a detected X-ray image of a subject, the process comprising the steps of:a) directing an X-ray beam produced by an X-ray tube, characterized by an output function comprising an X-ray tube current function and an X-ray tube voltage function, from a focus of the X-ray tube through the subject so that the beam impacts an image receptor to produce the detected X-ray image, where the intensity of primary X-ray radiation at a given point on the image receptor is characterized as a function of time by an image intensity function; b) placing a first grid between the subject and the image receptor, the first grid being an anti-scatter grid characterized by a grid transmission function that is a periodic function of position, characterized by a grid pitch; c) producing a grid motion by moving the grid at a velocity during an X-ray exposure, the velocity characterized as a velocity function; and d) modulating the output function such that for some thickness and composition of the subject, the image intensity function is substantially equal to the function i(t) defined by the equation i&af;(t)=v&af;(t)&it;h&af;(xC&af;(t))h&af;(x)&Congruent;(g&af;(x)v&af;(x))*R&af;(xnP)where xC(t) is the position of the center of the anti-scatter grid at time t, the velocity function v(x) is the velocity of the grid when the center of the anti-scatter grid is at position x, g(x) is an arbitrary function with a finite integral over x and has zero value outside a finite domain of x, h(x) is non-negative for every value of x, R(x) is the rect function, n is a positive integer, and P is the grid pitch.