Method and apparatus for examining a body by means of penetrating radiation such as x-rays

An image-reconstructive technique for examining a body by means of penetrating radiation, such as X-rays, is described. A pre-body collimator having a two-dimensional array of radiation-transmitting holes each bordered by radiation non-transmitting walls is disposed between the body and the source of radiation, and a plurality of exposures are made onto a radiation-sensitive surface, in which the radiation is projected through the collimator while the radiation source is at a plurality of different locations, such that during the successive exposures, the radiation from the source passes through different ray paths defined by the holes in the pre-body collimator. The radiation level received by each of the radiation-sensitive surface elements is detected, stored, and processed to reconstruct the two-dimensional radiation pattern but with enhanced resolution. Preferably a post-body collimator is also used to suppress scattering. Described are a four-exposure procedure and a nine-exposure procedure