23 February 2012 Dose reduction potential with photon counting computed tomography
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Electronic noise becomes a major source of signal degradation in low-dose clinical computed tomography (CT). In current clinical scanners based on energy integrating x-ray detectors, electronic noise from the readout circuits adds a noise of constant variance, which is negligible at high counts but can be significant at low count levels. On the other hand, in a photon counting detector (PCD) with pulse height discrimination capability, electronic noise has little to no impact on the measured signal. PCDs are known for their abilities to provide useful spectral information. In this work, we investigate this dose reduction to improve low-dose single-energy CT. We perform low-dose single-energy CT simulations using both energy integrating and photon counting detectors, and compare results with both analytical and iterative reconstructions (IR). The results demonstrate the dose reduction potential of PCDs in conventional low-dose single-energy CT examinations, when spectral information is not required.
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Xiaolan Wang, Xiaolan Wang, Alexander Zamyatin, Alexander Zamyatin, Daxin Shi, Daxin Shi, } "Dose reduction potential with photon counting computed tomography", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 831349 (23 February 2012); doi: 10.1117/12.911631; https://doi.org/10.1117/12.911631

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