16 March 2011 The effect of characteristic x-rays on the spatial and spectral resolution of a CZT-based detector for breast CT
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Abstract
In an effort to improve the early stage detection and diagnosis of breast cancer, a number of research groups have been investigating the use of x-ray computerized tomography (CT) systems dedicated for use in imaging the breast. Preliminary results suggest that dedicated breast CT systems can provide improved visualization of 3D breast tissue as compared to conventional mammography. However, current breast CT prototypes that are being investigated have limitations resulting in less than desirable spatial resolution, lesion contrast, and signal-to-noise (SNR) ratio. Another option is a CT breast imaging system that uses a cadmium zinc telluride (CZT) based detector operating in a photon counting mode. This paper uses a Monte Carlo simulation to evaluate the effect of characteristic x-rays on spatial and spectral resolution for a CZT detector used for breast CT. It is concluded that using CZT of 500-750 μm would not cause significant differences in spatial or spectral resolution, nor in stopping power as compared to using CZT with thickness 2-3 mm.
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Stephen J. Glick and Clay S. Didier "The effect of characteristic x-rays on the spatial and spectral resolution of a CZT-based detector for breast CT", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 796110 (16 March 2011); doi: 10.1117/12.877784; https://doi.org/10.1117/12.877784
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