Radiation detection circuit and radiological imaging apparatus using the same

Abstract

There is a need for high-precision detection timing in a radiological imaging apparatus using a semiconductor detector so as to decrease time variations against a noise and easily correct process variations. A radiation detection circuit includes: a semiconductor detector; charge accumulation means connected to the semiconductor detector; a circuit to discriminate timing of a signal generated from the charge accumulation means based on a specified threshold value; a shaperto limit a band from the charge accumulation means using a first time constant; a shaperto limit a band from the charge accumulation means using a second time constant; a circuitto hold an analog peak valuefor the shaper; and a circuitto hold an analog peak valuefor the shaper. The radiation detection circuit performs a signal process to generate timing correction data based on the analog peak valuesandand correct timing data from the timing discriminator circuit.