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Spectral optimization for dedicated breast CT
Medical Physics, 2010Purpose:The authors investigated the choice of spectra for the optimization of the dose‐weighted contrast‐to‐noise ratio (CNRD) for a dedicated breast CT scanner. The objective is to provide the desired image quality level at minimal dose values. The CNRD was investigated as a function of energy or tube voltage and filtrations for various breast sizes ...
Michaela, Weigel +2 more
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Spectral CT reconstruction using image sparsity and spectral correlation
2015 IEEE 12th International Symposium on Biomedical Imaging (ISBI), 2015Spectral data across energy bins are highly correlated but the signal to noise ratio is generally poor for each energy bin due to the narrow bin width and resultant quantum noise. To address this problem, in this paper we propose a spectral CT reconstruction approach that simultaneously reconstructs x-ray attenuation coefficients in all the energy bins,
Yi Zhang 0018 +5 more
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Thoracic Applications of Spectral CT Scan
CHESTThoracic imaging with CT scan has become an essential component in the evaluation of respiratory and thoracic diseases. Providers have historically used conventional single-energy CT; however, prevalence of dual-energy CT (DECT) is increasing, and as such, it is important for thoracic physicians to recognize the utility and limitations of this ...
Jonathan Moore +6 more
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2013
Spectral x-ray computed tomography (CT) is an important nascent imaging modality with several exciting potential applications. The research presented in this thesis separates into two primary areas with the common underlying theme of spectral CT; the first area is Compton scatter estimation and the second is interior tomography.
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Spectral x-ray computed tomography (CT) is an important nascent imaging modality with several exciting potential applications. The research presented in this thesis separates into two primary areas with the common underlying theme of spectral CT; the first area is Compton scatter estimation and the second is interior tomography.
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2013
Spectral CT algorithms generally target two different tasks: On one hand, it is of interest to distinguish between two materials that yield the same range of CT numbers in a standard CT image. Two or more spectral CT measurement channels with distinct spectral weightings often yield an improved segmentation between the two materials, both in a ...
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Spectral CT algorithms generally target two different tasks: On one hand, it is of interest to distinguish between two materials that yield the same range of CT numbers in a standard CT image. Two or more spectral CT measurement channels with distinct spectral weightings often yield an improved segmentation between the two materials, both in a ...
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Methods for Spectral CT Imaging
2019From the earliest days of X-ray computed tomography (CT), it was realized that measurements made with different X-ray spectra could be used to differentiate materials having different atomic numbers. Successful implementation of this technique, often referred to as dual-energy CT, has occurred over the last decade (circa 2009–2019), bringing with it ...
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Algorithms for MARS spectral CT.
2015This thesis reports on algorithmic design and software development completed for the Medipix All Resolution System (MARS) multi-energy CT scanner. Two areas of research are presented - the speed and usability improvements made to the post-reconstruction material decomposition software; and the development of two algorithms designed for the ...
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Physics of Spectral CT Measurements
2013Figure 2.1 depicts the setup of a spectral CT x-ray attenuation measurement. The source S emits a flux of x-ray quanta at an object. The object consists of x-ray-attenuating materials that are described by their spectral attenuation coefficient μ( E , r ) at position r . The detector registers the quanta passing through the object.
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The effect of spectral albedo in bifacial photovoltaic performance
Solar Energy, 2022Carsten Dam-Hansen +2 more
exaly
Histograms of oriented mosaic gradients for snapshot spectral image description
ISPRS Journal of Photogrammetry and Remote Sensing, 2022Seong G Kong +2 more
exaly