Abstract: A mechanism is provided for mounting a detector head including a collimator onto supporting structure of a radiation detector for rotation about a selected one of a plurality of trunnion axes, the selection being made so that rotation occurs about the trunnion axis which passes nearest to the center of gravity of the head. A first rotatable member is mounted to the supporting structure for rotation about a first trunnion axis and a second rotatable member is mounted to the first rotatable member for rotation about a second trunnion axis. A key mounted on the first rotatable member shifts between protrusion into a first key slot located on the supporting structure and a second key slot located on the second rotatable member. The shifting mechanism is locked when the detector head is in a position other than a collimator changing position.

Abstract: A mechanism is provided for mounting a detector head including a collimator onto supporting structure of a radiation detector for rotation about a selected one of a plurality of trunnion axes, the selection being made so that rotation occurs about the trunnion axis which passes nearest to the center of gravity of the head. A first rotatable member is mounted to the supporting structure for rotation about a first trunnion axis and a second rotatable member is mounted to the first rotatable member for rotation about a second trunnion axis. A key mounted on the first rotatable member shifts between protrusion into a first key slot located on supporting structure and a second key slot located on the second rotatable member. The shifting mechanism is locked when the detector head is in a position other than a collimator changing position.

Abstract: A mechanism is provided for mounting a detector head including a collimator onto supporting structure of a radiation detector for rotation about a selected one of a plurality of trunnion axes, the selection being made so that rotation occurs about the trunnion axis which passes nearest to the center of gravity of the head. A first rotatable member is mounted to the supporting structure for rotation about a first trunnion axis and a second rotatable member is mounted to the first rotatable member for rotation about a second trunnion axis. A key mounted on the first rotatable member shifts between protrusion into a first key slot located on the supporting structure and a second key slot located on the second rotatable member. The shifting mechanism is locked when the detector head is in a position other than a collimator changing position.

Abstract: A collimator changing assembly mounted on the support structure of a scintillation camera. A vertical support column positioned proximate the detector support column with a plurality of support arms mounted thereon in a rotatable cantilevered manner at separate vertical positions. Each support arm is adapted to carry one of the plurality of collimators which are interchangeably mountable on the underside of the detector and to transport the collimator between a store position remote from the detector and a change position underneath said detector.