A dual-layer direct/indirect flat panel detector for improved material decomposition: first studies of the indirect layer

Kaitlin Hellier; Ivan Mollov; Paul Pryor; Shiva Abbaszadeh

doi:10.1117/12.2653390

7 April 2023 A dual-layer direct/indirect flat panel detector for improved material decomposition: first studies of the indirect layer

Kaitlin Hellier, Ivan Mollov, Paul Pryor, Shiva Abbaszadeh

Author Affiliations +

Proceedings Volume 12463, Medical Imaging 2023: Physics of Medical Imaging; 124632E (2023) https://doi.org/10.1117/12.2653390
Event: SPIE Medical Imaging, 2023, San Diego, California, United States

Conference Poster

Abstract

In medical imaging, material decomposition and lesion differentiation are essential for the early detection of many severe and deadly diseases. While standard flat panel imagers are capable of providing high-resolution images, they lack the ability to differentiate between X-ray energies and, therefore, soft and hard tissues. Detection of multiple X-ray energies by dual-shot, photon counting, or dual-layer detectors provides a route for differentiation of these tissues based on the spectrum observed; multiple images may be generated based on the energies, allowing for subtraction and a more detailed image of tissues and calcifications. To improve the resolution, dose level, and motion artifacts of these imagers, we propose a new dual-layer detector consisting of a direct conversion amorphous selenium top layer, followed by an indirect conversion scintillator/amorphous selenium bottom layer. In this work, we present the first steps towards building this detector by characterizing the performance of the bottom indirect flat panel. We show that the blocking layer chosen, though unoptimized, performs adequately up to 50 V/um and have fabricated the detector, which will be evaluated for detective quantum efficiency and modulation transfer function.

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Kaitlin Hellier, Ivan Mollov, Paul Pryor, and Shiva Abbaszadeh "A dual-layer direct/indirect flat panel detector for improved material decomposition: first studies of the indirect layer", Proc. SPIE 12463, Medical Imaging 2023: Physics of Medical Imaging, 124632E (7 April 2023); https://doi.org/10.1117/12.2653390

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