Imaging apparatus

摘要

The invention relates to an imaging apparatus (31) for imaging an object. A reconstruction unit (12) determines component projection data values, which correspond to, for example, a base material of the object, and reconstructs an image of the object based on the determined component projection data values. A component projection data value, which corresponds to a ray, is determined as a combination of weighted base functions, which depend on energy projection data values of the same ray and the orientation of the same ray. This allows considering a possible dependency of the corresponding decomposition on the orientation of the ray, thereby allowing the imaging apparatus to improve the quality of decomposing the provided energy projection data values into the component projection data values and thus of a finally reconstructed image of the object, which is reconstructed based on the component projection data values.

主权项

1. An imaging apparatus for imaging an object, the imaging apparatus comprising:
a projection data providing unit for providing energy projection data values, the energy projection data values being energy-dependent and corresponding to rays, which have been emitted by a radiation source and which have traversed the object and a beam shaper placed between the radiation source and the object, a reconstruction unit for reconstructing an image of the object based on the provided energy projection data values, wherein the reconstruction unit is adapted to: determine component projection data values, corresponding to the rays after having traversed the object and to a component of the object, by combining weighted base functions based on the provided energy projection data values and a component projection data value corresponding to a ray modeled as a combination of weighted base functions, wherein said weighted base function depends on a product of a first intermediate base function and a second intermediate based function, wherein said first intermediate base function depends on the energy projection data values and said second intermediate base function depends on the length of the respective ray within the beam shaper, reconstruct an image of the object based on the determined component projection data values.