Abstract: A multipurpose apparatus for making normal or tomographic investigations by means of a gamma camera. The apparatus comprises an image detector head mounted on a gantry supported by a column running on guides, which detector head is set in motion in a plane determined by said guides and said column to describe a closed curve trajectory about a supported bed on which the patient is accommodated. The detector head can also rotate about its own support axis, such rotation being such as to allow the head to maintain the detection surface at all times tangential to said trajectory.