Three-dimensional image reconstruction using pinhole arrays

From multiple single-pinhole exposures of a three dimensional object, taken with a position-sensitive gamma-ray detector, tomographic images of radionuclide distribution in patients during diagnostic tests are formed with the aid of a computer. The effects of obscuring, offplane activity are removed for a number of transverse planes through the object in a three dimensional image reconstruction method which uses the tomographic images as input. Lateral resolution, detector counting rate, total exposure times, and statistical accuracy of the final image are comparable to those of the single pinhole camera. The mathematical technique of the reconstruction method is applicable to images produced by a number of tomographic imaging devices. (U.S.)