22 March 2010 A research prototype system for quantum-counting clinical CT
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Recent publications emphasize the benefits of quantum-counting applied to the field of Computed Tomography (CT). We present a research prototype scanner with a CdTe-based quantum-counting detector and 20 cm field-of-view (FOV). As of today there is no direct converter material on the market able to operate reliably in the harsh high-flux regime of clinical CT scanners. Nevertheless, we investigate the CT imaging performance that could be expected with high-flux capable material. Therefore we chose pixel sizes of 0.05 mm2, a good compromise between high-flux counting ability and energy resolution. Every pixel is equipped with two energy threshold counters, enabling contrast-optimization and dual-energy scans. We present a first quantitative analysis of contrast measurements, in which we limit ourselves to a low-flux scenario. Using an Iodine-based contrast agent, we find 17% contrast enhancement at 120 kVp, compared to energy-integrating CT. In addition, the general dual-energy capability was confirmed in first measurements. We conclude our work by demonstrating good agreement of measurement results and detailed CT-system simulations.
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S. Kappler, F. Glasser, S. Janssen, E. Kraft, M. Reinwand, "A research prototype system for quantum-counting clinical CT", Proc. SPIE 7622, Medical Imaging 2010: Physics of Medical Imaging, 76221Z (22 March 2010); doi: 10.1117/12.844238; https://doi.org/10.1117/12.844238

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