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Improving image quality in photon counting-mode detector systems

A photon counting and detector technology, applied in the field of x-ray imaging, which can solve problems such as loss of energy information

Active Publication Date: 2012-12-19
普里马蒂森索斯公司
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Problems solved by technology

[0014] There is therefore a need to improve the performance of photon counting imaging systems, with respect to, for example, the loss of energy information of events in cases where the bulk energy is substantially changed from the actual x-ray quantum energy, but in a statistically known manner (e.g. in Compton scattering of k-edge fluorescence in the detector), a decisive influence on the pile-up introduced by the readout electronics, and finally the problem of noisy counting in low energy bins

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Embodiment Construction

[0043] It may be useful to start with a brief overview of the prior art. Various approaches have been proposed to compromise the flux rate problem in photon counting radiography including computed tomography. These include but are not limited to:

[0044] Depth segmentation of the effective detector into multiple layers to reduce count rates (U.S. Patent No. 5,434,417 issued to David Nygren in 1995 and Buchinsky titled "Multiple layer detector for spectral computed tomography imaging" layer detector)" US Patent Application US 2008 / 0315106A1).

[0045] Introducing a drift structure to reduce the duration of the induced current pulse ("Pixelated cadmium zink telluride based photon counting mode detector" by Iwanczyk et al., US 2005 / 0139757A1)

[0046] Introduce the magnitude of the detector layer where the signal from one layer is used to statistically correct the measured count rate in the other layer (Tkaczyk et al. "Photon counting x-ray detector with overrange logic contro...

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Abstract

The current invention applies to photon counting silicon x-ray detectors with energy discriminating capabilities and applications in x-ray imaging systems. The overall image quality produced by such a system is improved by the presented novel methods for optimally using the energy information in Compton events and making selective use of counts induced from charges collected in neighboring pixels. The pile-up problem during high-flux imaging regimes is reduced by a novel method for signal reset, which improves the count efficiency by reducing the risk of losing event due to signal pile-up in the read out electronics chain.

Description

technical field [0001] This application is a continuation-in-part of US12 / 488930, filed June 22, 2009, US61 / 151637 (provisional), filed February 11, 2009, the disclosures of which are hereby incorporated herein. [0002] The present invention relates to x-ray imaging, and more particularly to photon counting x-ray imaging. Background technique [0003] Theoretical considerations have shown that an ideal photon-counting energy-sensitive detector applying an optimized energy-weighting scheme has improved performance in radiographic images (x-ray radiography and computed tomography) compared to energy-integrating systems at the same patient dose. Potential for contrast-to-noise ratios of 20-60% in: "Detective quantum efficiency dependence on x-ray energy weighting in mammography" by Cahn et al., Medical Physics 26, pp. 2680-2683, (1999); Shikhaliev's "Projection x-ray imaging with photon energy weighting: experimental evaluation with a prototype detector (projection x-ray imag...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/24A61B6/03G01N23/04G01T1/16G01T1/17G06T11/00
CPCG01N23/04G06T11/005G01T1/17G01T1/24G06T11/00G06T2211/408A61B6/03G01T1/16G01T1/1663G01T1/366
Inventor 马斯·丹尼尔森汉斯·博恩福尔克克里斯特·斯文森
Owner 普里马蒂森索斯公司
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