Method and system for spectral computed tomography (ct) with inner ring geometry

A method of retrofitting energy differentiating detectors in an existing image scanner for reconstructing an image, the image scanner rotating an radiation emitting source along a first path around a predetermined center while continuously emitting energy towards an object, the image scanner rotating an energy integrating detector for detecting intensity data along a second path around the predetermined center, comprising

• fixedly placing a predetermined number of energy differentiating detectors along a third path around the predetermined center, third path being inside the first path, the energy differentiating detectors detecting spectral data;
• and
• reconstructing an image based upon the intensity data and the spectral data.

A modular device for retrofitting energy differentiating detectors in an existing image scanner for reconstructing an image, the image scanner rotating an radiation emitting source along a first path around a predetermined center while continuously emitting energy towards an object, the image scanner rotating an energy integrating detector for detecting intensity data along a second path around the predetermined center, comprising

• a predetermined number of energy differentiating detectors for detecting spectral data;
• and
• a module housing for housing a predetermined number of said energy differentiating detectors fixedly placed along a third path, third path being inside the first path as said module housing is retrofitted into the existing image scanner, whereas the scanner reconstructs an image based upon the intensity data and the spectral data.