Patent ID: 7138634
Filing Date: 2006-11-21
Classification: G01T

Abstract:
1. A nuclear medical diagnostic apparatus, comprising: a radiation detector in a form of a single layer including a plurality of semiconductor cells that (1) are arranged in a matrix, (2) detect radiation separately, and (3) output signals representing an energy of the radiation separately; a selection circuit which, in order to select, among events wherein the radiation is detected, a specific event wherein radiation derived from a radio-isotope injected into a subject is detected and a total energy of not less than two respective signals substantially simultaneously output from not less than two semiconductor cells falls in a predetermined energy window; a position calculation circuit configured (1) to select one semiconductor cell of said not less than two semiconductor cells based only on respective energies of the not less than two respective signals, and (2) to calculate an incidence position based on a position of the selected one semiconductor cell; a counting circuit configured to count the specific event in association with the calculated incidence position; and a circuit configured to generate a distribution of radio-isotope in the subject on the basis of a counting result, wherein said position calculation circuit is configured to select, from said not less than two semiconductor cells, said one semiconductor cell that outputs a signal representing a minimum energy, when said not less than two semiconductor cells are located in a first area, and to select said one semiconductor cell that outputs a signal representing a maximum energy, when said not less than two semiconductor cells are located in a second area.