Patent ID: 6744845
Filing Date: 2004-06-01
Classification: A61B,G01N

Abstract:
A computed tomography apparatus comprising:a scanning unit which is rotatable, relative to an examination zone, around an axis of rotation which extends through the examination zone; a radiation source for generating a primary radiation fan beam which traverses the examination zone; a two-dimensional detector array which includes a plurality of detector elements defining a measuring surface, a first part of the measuring surface for detecting primary radiation from the primary fan beam and a second part of the measuring surface for detecting scattered radiation produced in the examination zone; a modulation unit for the temporally and spatially periodic modulation of the primary fan beam, said modulation unit disposed between the radiation source and the examination zone and, a determining unit for determining a momentum transfer spectrum from cross-correlations between the measured scattered radiation of the individual detector elements and a modulation signal used for the modulation of the primary fan beam.