Radiography

Computerized tomographic apparatus including first support means supporting at least one source of penetrating radiation, first scanning means causing angular movement of said first support means, and with it said source, around a patient position, said source being disposed on said first support means to irradiate the patient position with said penetrating radiation during the angular movement, detector means including a plurality of detector devices sensitive to said radiation for detecting radiation emergent from the patient positions, the irradiation of the patient position and the detection of the radiation being effected in a common plane, the detector means including further detector devices in addition to those receiving said radiation at any one time;

• second support means, including a ring surrounding said patient position supporting said detector means, with said further detector devices and said first-mentioned detector devices symmetrically distributed around said ring with the detector devices of said detector means being disposed closer to said patient position than is said source, means causing relative movement between the source and the first support means on the one hand and the detector means on the other hand to scan the radiation relative to the patient position and the detector means, and means constraining said further detector devices to allow free passage of said radiation to said first-mentioned detector devices.