Abstract
Cadmium zinc telluride (CdZnTe) is currently of interest as a photoconductor in direct conversion digital X-ray medical imaging. A critical performance parameter of an X-ray detector is the Swank factor for degradation of the signal to noise ratio, or zero spatial frequency detective quantum efficiency, due to conversion gain fluctuation in electron-hole pair creation. Based on the measured electron-hole pair creation energy and energy band gap, the Swank factor is evaluated by the Markov process. At incident X-ray energy below the K-edge of Cd, the Swank factor is nearly 1.0. At higher energy above the K-edge of Cd, however, the Swank factor is largely affected by the escape of Cd/Te characteristic X-rays, If the photon energy is below the K-edge of Cd, the fluctuation in EHP creation has almost no influence on detector performance.
Original language | English |
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Pages (from-to) | S538-S541 |
Journal | Journal of the Korean Physical Society |
Volume | 45 |
Issue number | SUPPL. |
Publication status | Published - 2004 Dec |
Keywords
- CdZnTe
- DQE
- Detective Quantum Efficiency
- High resistivity
- Monte Carlo method
- Polycrystalline
- Swank factor
ASJC Scopus subject areas
- General Physics and Astronomy