Analytic Model of Energy-Absorption Response Functions in Compound X-ray Detector Materials

作者：Yun Seungman; Kim Ho Kyung^*; Youn Hanbean; Tanguay Jesse; Cunningham Ian A

来源：IEEE Transactions on Medical Imaging, 2013, 32(10): 1819-1828.

DOI：10.1109/TMI.2013.2265806

• Absorbed energy distribution (AED)
• compound semiconductor
• Compton scattering
• detector response function
• digital radiography
• fluorescence
• photoelectric absorption
• photon-counting imaging
• X-ray convertor

The absorbed energy distribution (AED) in X-ray imaging detectors is an important factor that affects both energy resolution and image quality through the Swank factor and detective quantum efficiency. In the diagnostic energy range (20-140 keV), escape of characteristic photons following photoelectric absorption and Compton scatter photons are primary sources of absorbed-energy dispersion in X-ray detectors. In this paper, we describe the development of an analytic model of the AED in compound X-ray detector materials, based on the cascaded-systems approach, that includes the effects of escape and reabsorption of characteristic and Compton-scatter photons. We derive analytic expressions for both semi-infinite slab and pixel geometries and validate our approach by Monte Carlo simulations. The analytic model provides the energy-dependent X-ray response function of arbitrary compound materials without time-consuming Monte Carlo simulations. We believe this model will be useful for correcting spectral distortion artifacts commonly observed in photon-counting applications and optimal design and development of novel X-ray detectors.

• 出版日期2013-10