Patent ID: 6043494
Filing Date: 2000-03-28
Classification: A61B,G01T

Abstract:
A gamma camera system comprising:a main detector for detecting gamma rays emitted from RIs injected into a subject;an emitter for emitting gamma rays to a subject;a sub-detector for detecting the gamma rays emitted from said emitter and transmitted through said subject, said sub-detector having at least one semiconductor element for directly detecting the gamma rays;a calculator for calculating an absorption ratio showing to what degree the gamma rays are absorbed in said subject based on an output of said sub-detector; anda processor for counting the number of gamma rays emitted from RIs injected into said subject to correct count values based on said absorption ratios and to reconstruct a RI-distribution based on the corrected count values;wherein said sub-detector and said emitter are arranged relative to said main detector such that an incident direction of gamma rays which can be detected by said sub-detector is different from an incident direction of gamma rays which can be detected by said main detector.