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An Alloyed a-Se-Te Indirect Flat Panel Imager for Improved Performance in a Dual-Layer X-ray Detector
Kaitlin Hellier1, Kellii Fusari1,2, Paul Pryor3
1Electrical and Computer Engineering, University of California, Santa Cruz, 1156 High St., Santa Cruz, CA, USA, 95064.
Summary
Researchers improved dual-layer X-ray detectors by alloying amorphous selenium (a-Se) with tellurium (Te). This enhances conversion efficiency by over 30%, paving the way for better lesion differentiation in medical imaging.
Area of Science:
- Medical Imaging
- Materials Science
- Physics
Background:
- Dual-layer detectors enable energy separation for improved lesion differentiation and material decomposition.
- Existing direct/indirect dual-layer detectors using amorphous selenium (a-Se) face limitations in spatial resolution due to scintillator performance.
- Cesium iodide (CsI:Tl) scintillators offer better spatial resolution but have emission peaks misaligned with a-Se's optimal wavelengths.
Purpose of the Study:
- To enhance the performance of amorphous selenium (a-Se) photoconductive layers for use in dual-layer X-ray detectors.
- To overcome the wavelength mismatch between CsI:Tl scintillators and a-Se.
- To investigate the effects of tellurium (Te) alloying on a-Se detector properties.
Main Methods:
- Fabrication of single-pixel a-Se-Te detectors with varying Te concentrations (0%, 10%, 15%, 20%).
- Inclusion of a parylene blocking layer in the detector design.
- Evaluation of detector performance, including leakage currents, lag, and conversion efficiency.
Main Results:
- Alloying a-Se with Te improved X-ray conversion efficiency by over 30%.
- Increased Te content led to higher leakage currents and lag.
- The enhanced absorption and signal production show promise for integration with CsI:Tl scintillators.
Conclusions:
- Alloying amorphous selenium with tellurium is a viable strategy to improve X-ray detector efficiency.
- The improved performance of a-Se-Te detectors supports their potential use in advanced dual-layer flat panel detectors (FPDs).
- This development could lead to enhanced capabilities in medical imaging, such as improved lesion detection and material analysis.
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