Patent ID: 6104777
Filing Date: 2000-08-15
Classification: G06T

Abstract:
Process for the correction of scatter energy in digital X-ray images obtained on a detector, by means of a source emitting a spectrum of ionizing energies which pass through an object, comprising the following stages:using an X-ray and a first three-dimensional model of the object, a second model of the object is generated adapted to its geometry;the energy spectrum of the source is made discrete and to each zone of this object an average density value is allocated and, for each of the energies of the discrete spectrum three mass coefficients of absorption, coherent scatter and incoherent scatter are allocated, and, by multiplying the density with these mass coefficients, the coefficients of absorption, coherent scatter and incoherent scatter are determined for each zone;primary energy is mapped;along the source-point tracklength of the map of primary energy, a new average density value is determined for each of these zones and for each source-point tracklength of the detector;for each energy the mass coefficient is multiplied by the density for each source-point tracklength of the detector and for each zone, and a coherent scatter coefficient and an incoherent scatter coefficient is obtained per energy, per tracklength, and per zone;scatter energy is mapped;the map of primary energy is determined by subtracting the map of scatter energy from the map of observed transmission and an image of the object is obtained.