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of 51
pro vyhledávání: '"Grönberg, Fredrik"'
Photon-counting spectral computed tomography is now clinically available. These new detectors come with the promise of higher contrast-to-noise ratio and spatial resolution and improved low-dose imaging. However, one important design consideration is
Externí odkaz:
http://arxiv.org/abs/2302.00921
Purpose: The set of linear attenuation coefficients that belong to materials in the human body is commonly assumed to be spanned by two basis functions in the range of clinical x-ray energies, even though there is evidence that the dimensionality of
Externí odkaz:
http://arxiv.org/abs/2208.05362
Autor:
Grönberg, Fredrik, Bornefalk, Hans
Purpose: To evaluate a proposed method to reconstruct CT numbers that accurately mimic conventional CT numbers from spectral CT data, as would have been produced by a conventional system without effects of beam hardening. Approach: We implement the p
Externí odkaz:
http://arxiv.org/abs/2208.04773
Background: Edge-on-irradiated silicon detectors are currently being investigated for use in photon-counting CT applications. The low atomic number of silicon leads to a significant number of incident photons being Compton scattered in the detector,
Externí odkaz:
http://arxiv.org/abs/2206.04164
Autor:
Zheng, Yifan, Yveborg, Moa, Grönberg, Fredrik, Xu, Cheng, Su, Qianqian, Danielsson, Mats, Persson, Mats
An important question when developing photon-counting detectors for computed tomography is how to select energy thresholds. In this work thresholds are optimized by maximizing signal-difference-to-noise ratio squared (SDNR2) in an optimally weighted
Externí odkaz:
http://arxiv.org/abs/1802.00965
Akademický článek
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Autor:
Grönberg, Fredrik
We study a multi-agent system in R2 where agents have unicycle dynamics with time varying speed and control inputs corresponding to acceleration and angular velocity. The system has a dynamic communication topology based on proximity. We propose a no
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-138438
Autor:
Zheng, Yifan, Yveborg, Moa, Grönberg, Fredrik, Xu, Cheng, Su, Qianqian, Danielsson, Mats, Persson, Mats
Publikováno v:
In Nuclear Inst. and Methods in Physics Research, A 11 February 2020 953
In this paper we consider the minimum time population transfer problem for a two level quantum system driven by {\em two} external fields with bounded amplitude. The controls are modeled as real functions and we do not use the Rotating Wave Approxima
Externí odkaz:
http://arxiv.org/abs/1211.0666
Akademický článek
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