Sequential method for high 3-D resolution imaging in nuclear medicine

A sequential method is developed to obtain a high resolution 3-D image distribution of the activity of a radioactive tracer. Two different types of reconstruction are presented. The first method, related to X or γ ray motion tomography, yields reconstructed objects slices (tomograms) containing superimposed out-of-focus blurred planes. The second method, utilizing computer processing, generates each plane (slice) separately, free from out-of-focus images, as in X-ray scanner transaxial tomography. This approach avoids calculations of the tomograms and improves the restitution of low spatial frequencies. A method of spatial filtering for quantum noise reduction is also proposed.