Device for measuring radiation absorption in a three- dimensional object

Abstract From the Canadian patent

In known devices for reconstructing the absorption distribution in a three-dimensional body the body is not, only imaged in a plane which is perpendicular with respect to the axis of rotation of the radiator/detector system but also in a direction perpendicular thereto. The radiation is measured in both directions by a two-dimensional detector device. The reconstruction, however, is problematic and also involves measuring errors if the angle of aperture of the radiation beam in the latter direction (parallel with respect to the axis of rotation) is to large. These difficulties are eliminated in accordance with the invention in that the body to be examined is imaged from two groups of …