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Modeling the imaging performance of prototype organic x-ray imagers.
1Department of Medical Physics and Bioengineering, University College London, London WCIE 6BT, United Kingdom. james.blakesley@physics.org
Medical Physics
|February 26, 2008
Summary
A new model simulates active-matrix flat-panel imagers, predicting performance for organic semiconductor detectors. It suggests back-side illumination or dual arrays can significantly improve resolution and detective quantum efficiency.
Area of Science:
- Medical Physics
- Materials Science
Background:
- Active-matrix flat-panel imagers are crucial for medical imaging.
- Developing advanced imagers with organic semiconductors presents unique challenges.
Purpose of the Study:
- To present a unified Monte Carlo and cascaded systems model for simulating active-matrix flat-panel imagers.
- To predict the performance of conceptual organic semiconductor-based imagers.
- To investigate the impact of semiconductor properties on imager performance.
Main Methods:
- Development of a unified Monte Carlo and cascaded systems simulation model.
- Validation of the model against previously measured flat-panel imagers.
- Application of the model to predict properties of conceptual organic semiconductor imagers.
Main Results:
- The model accurately simulated existing flat-panel imager performance with minimal input parameters.
- Back-side illuminated configurations or face-to-face dual arrays show potential for improved resolution and detective quantum efficiency.
- Satisfactory prototype imagers require 25% photodiode quantum efficiency and <100 pA mm(-2) dark current.
Conclusions:
- Conceptual organic semiconductor imagers can achieve significant performance gains through specific configurations.
- Competitive imagers necessitate high photodiode quantum efficiency (40-50%) and very low dark current (<10 pA mm(-2)) for quantum-limited operation.
- The developed model is a valuable tool for designing and optimizing next-generation flat-panel imaging detectors.
