Frequency-dependent signal and noise in spectroscopic x-ray imaging.

ABSTRACT:

Purpose

We present a new framework for theoretical analysis of the noise power spectrum (NPS) of photon-counting x-ray detectors, including simple photon-counting detectors (SPCDs) and spectroscopic x-ray detectors (SXDs), the latter of which use multiple energy thresholds to discriminate photon energies.

Methods

We show that the NPS of SPCDs and SXDs, including spatio-energetic noise correlations, is determined by the joint probability density function (PDF) of deposited photon energies, which describes the probability of recording two photons of two different energies in two different elements following a single-photon interaction. We present an analytic expression for this joint PDF and calculate the presampling and digital NPS of CdTe SPCDs and SXDs. We calibrate our cha

SUBMITTER: Tanguay J 

PROVIDER: S-EPMC7496729 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature