Towards a Novel Dual-Modality Imaging Using Scattered Radiation

This paper presents a new dual-modality imaging principle using two recent results. The first one demonstrates the feasibility of reconstruction of a radioactive distribution from its Compton-scattered radiation. This may be regarded as a novel gamma-ray emission imaging principle. The second one shows the possibility to reconstruct the electronic density of a medium and its attenuation map from other Compton-scattered radiation emitted by an external gamma source and scattered in the medium. The required data for the two reconstructions are easily acquired from an energy and space measuring gamma camera under the form of scattered distribution images classified by their Compton-scattering angle. The usual motion of camera is no longer necessary and so all images needed for a three-dimensional reconstruction are recorded simultaneously. For non-immobile object, this is a decisive advantage