Frequency-dependent MTF and DQE of photon-counting x-ray imaging detectors (Conference Presentation)

Jesse Tanguay; Nicholas Mantella; Ian A. Cunningham

doi:10.1117/12.2512964

14 March 2019 Frequency-dependent MTF and DQE of photon-counting x-ray imaging detectors (Conference Presentation)

Jesse Tanguay, Nicholas Mantella, Ian A. Cunningham

Proceedings Volume 10948, Medical Imaging 2019: Physics of Medical Imaging; 109481X (2019) https://doi.org/10.1117/12.2512964
Event: SPIE Medical Imaging, 2019, San Diego, California, United States

Abstract

Theoretical modeling of the performance of x-ray imaging detectors enables understanding relationships between the physics of x-ray detection and x-ray image quality, and enables theoretical optimization of novel x-ray imaging techniques and technologies. We present an overview of a framework for theoretical modeling of the frequency-dependent signal and noise properties of single-photon-counting (SPC) and energy-resolving x-ray imaging detectors. We show that the energy-response function, large-area gain, modulation transfer function (MTF), noise power spectrum (NPS) (including spatio-energetic noise correlations) and detective quantum efficiency (DQE) of SPC and energy-resolving x-ray imaging detectors are related through the probability density function (PDF) describing the number electron-hole (e-h) pairs collected in detector elements following individual x-ray interactions. We demonstrate how a PDF-transfer approach can be used to model analytically the MTF and NPS, including spatio-energetic noise correlations, of SPC and energy-resolving x-ray imaging detectors. Our approach enables modeling the combined effects of stochastic conversion gain, electronic noise, characteristic emission, characteristic reabsorption, coulomb repulsion and diffusion of e-h pairs and energy thresholding on the MTF and NPS. We present applications of this framework to (1) analysis of the frequency-dependent DQE of SPC systems that use cadmium telluride (CdTe) x-ray converters, and (2) analysis of spatio-energetic noise correlations in CdTe energy-resolving x-ray detectors. The developed framework provides a platform for theoretical optimization of next-generation SPC and energy-resolving x-ray imaging detectors.

Conference Presentation

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Jesse Tanguay, Nicholas Mantella, and Ian A. Cunningham "Frequency-dependent MTF and DQE of photon-counting x-ray imaging detectors (Conference Presentation)", Proc. SPIE 10948, Medical Imaging 2019: Physics of Medical Imaging, 109481X (14 March 2019); https://doi.org/10.1117/12.2512964

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KEYWORDS

X-ray imaging

Sensors

Image sensors

Modulation transfer functions

X-ray detectors

Photodetectors

X-rays

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