Patent ID: 6278760
Filing Date: 2001-08-21
Classification: A61B

Abstract:
A radiation image forming method, wherein at least either one of a three-dimensional image and a tomographic image of an object is formed from projection image signals, which represent projection images of the object and which have been obtained by irradiating cone-like radiation from different directions of projection to the object, the method comprising the steps of:i) acquiring a plurality of projection image signals of different energy bands with respect to a single object and with respect to each direction of projection,ii) performing energy subtraction processing on the plurality of said projection image signals of the different energy bands, which projection image signals have been acquired with respect to the same direction of projection, an energy subtraction-processed projection image signal being thereby formed with respect to each direction of projection, andiii) forming at least either one of the three-dimensional image and the tomographic image of the object from the energy subtraction-processed projection image signals, which have been formed with respect to the different directions of projection.