An alloyed a-Se-Te indirect flat panel imager for improved performance in a dual-layer x-ray detector

Kaitlin Hellier; Kellii Fusari; Paul Pryor; Ivan Mollov; Shiva Abbaszadeh

doi:10.1117/12.3007292

1 April 2024 An alloyed a-Se-Te indirect flat panel imager for improved performance in a dual-layer x-ray detector

Kaitlin Hellier, Kellii Fusari, Paul Pryor, Ivan Mollov, Shiva Abbaszadeh

Proceedings Volume 12925, Medical Imaging 2024: Physics of Medical Imaging; 1292537 (2024) https://doi.org/10.1117/12.3007292
Event: SPIE Medical Imaging, 2024, San Diego, California, United States

Conference Poster

Abstract

Dual-layer detectors offer the potential for energy separation, allowing for lesion differentiation and material decomposition without the effects of motion blur that occur in dual-energy detection. We have proposed a direct/indirect dual-layer amorphous selenium (a-Se) detector, in which the direct conversion top layer absorbs low energy x-rays and higher energy x-rays pass through to be absorbed by the indirect conversion bottom layer. First studies of the indirect layer, consisting of a thin-film transistor (TFT) flat panel detector (FPD) with an a-Se photoconductive layer, show promising results, but the MTF was limited by the performance of the gadolinium oxysulfide scintillator used. To improve spatial resolution, a CsI:Tl scintillator should be employed. Unfortunately, the emission peak of CsI:Tl scintillators falls outside optimal wavelengths for a-Se photoconduction. By alloying the a-Se with Te and operating at high fields, we improve absorption and signal production in the FPD. In this work, this is we fabricate single pixel a-Se-Te detectors with a parylene blocking layer and give results for Te concentrations of 0%, 10%, 15%, and 20%. While leakage currents and lag increase with Te content, conversion efficiency is improved by over 30%, showing promise for implementation into an FPD with a CsI:Tl scintillator.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Kaitlin Hellier, Kellii Fusari, Paul Pryor, Ivan Mollov, and Shiva Abbaszadeh "An alloyed a-Se-Te indirect flat panel imager for improved performance in a dual-layer x-ray detector", Proc. SPIE 12925, Medical Imaging 2024: Physics of Medical Imaging, 1292537 (1 April 2024); https://doi.org/10.1117/12.3007292

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