Method for examining a body with penetrating radiation

In a device for examining a body using penetrating radiation which comprises:

• source means which generate a primary beam of said radiation, detector array means for measuring, and for generating output signals representing, scattered radiation generated in the body along the primary beam, diaphragm means disposed between the detector array means and the primary beam which define a slit shaped aperture having a longitudinal direction which is oriented at right angles to the primary beam;
• and a large plurality of lamellae of radiation-absorbing material disposed between the aperture and the detector array means which lamellae are disposed at least approximately in planes which intersect colinearly in and along the primary beam whereby the detector array means measure radiation which is both singly and multiply scattered in the body;
• the improvement which comprises:
• means for generating a relative displacement between the primary beam and the diaphragm means, the detector array means, and the lamellae so that, during a portion of the examination, the planes of the lamellae intersect outside of the primary beam whereby the detector array means only measure radiation which is multiply scattered in the body;
• and
• means which subtract output signals from the detectors which represent only said multiply scattered radiation from respective output signals which represent both singly and multiply scattered radiation to produce signals which represent only singly scattered radiation.