A method and device, e.g. a C-arm device, for radiographic and nuclear imaging of an object by means of x-ray and gamma emission imaging. The device comprises a support installation with opposed first and second support members, wherein an x-ray source is mounted on the first support member and an x-ray detector on the second support member. The first support member is additionally provided with at least two gamma cameras that are each located adjacent the x-ray source. Each of said at least two gamma cameras comprising a collimator with one or more collimator openings and a gamma radiation detector. Each of the at least two gamma cameras has an associated field of view. The fields of view of the gamma cameras overlap partly, said overlap defining a focus volume that is seen by the at least two gamma cameras. The focus volume is located between the x-ray source and the x-ray detector so that the x-ray beam passes through the focus volume and the focus volume F is seen by the x-ray detector. The x-ray source, x-ray detector, and gamma cameras are maintained in a stationary acquisition position during x-ray and gamma image data acquisition of x-ray and gamma radiation images respectively, which images are fused into a fused image.L'invention porte sur un procédé et un dispositif, par exemple un dispositif à arceau, d'imagerie radiographique et nucléaire d'un objet au moyen d'une imagerie par rayons X et émission gamma. Le dispositif comprend une installation de support comportant des premier et second éléments de support opposés, une source de rayons X étant montée sur le premier élément de support et un détecteur de rayons X sur le second élément de support. Le premier élément de support comporte en outre au moins deux gamma-caméras qui sont situées chacune adjacentes à la source de rayons X. Chacune desdites au moins deux gamma-caméras comprend un collimateur ayant une ou plusieurs ouvertures de collimateur et un détecteur de rayonnement gamma. Chacune des au moins
