PROBLEM TO BE SOLVED: To provide a technique of using an interaction depth information in conventional Anger camera, positron emission tomography, dual isotope imaging, etc., and its usage. SOLUTION: Radiation from a subject 18 which is received by a scintillation crystal 12 interacts with the scintillation crystal to produce a burst of scintillation light photons. The depth distribution at which interaction occurs varies in accordance with the energy of the received radiation. Low-energy radiation tends to interact at a shallow depth relative to a front face of the scintillation crystal and radiation with a high energy tends to interact relatively into the crystal. A moment processor 20 processes electronic information from photomultiplier tubes 14 which view the scintillation crystal to generate zero-th moment or energy information, first moment or coordinate information and second moment or depth information. The event information is filtered 34, 62, 66 and 82 in accordance with depth 26, e.g. sorted into acceptable/unacceptable information, information corresponding to each of two or more energies of radiation, and the like.
METHOD AND APPARATUS FOR DIAGNOSTIC IMAGING