12-6 CdTe X-ray Imaging sensor used pulse height signal processing in each photons

Abstract

When traditional signal-processing algorithm of photon-counting X-ray sensor was used in high count rate, energy resolution was decreased because of the pile-up phenomenon. This paper purposes to maintain the high energy resolution by changing the signal-processing algorithm which derived the digital energy value from the pulse rise height of the output waveform generated the pile-up from the CdTe detector. As a result, decreasing energy resolution in the pile up was improved. Furthermore, as a result of measurement energy spectrum in a high count rate, the FWHM was about 11keV (at 60keV) when the count rate of 500kcps. This result is indicated the possibility that the photon counting sensor has application for the high count rate imaging without decrease of the high energy resolution.