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pro vyhledávání: '"Graham C. Wiggins"'
Autor:
Martijn A. Cloos, Florian Knoll, Tiejun Zhao, Kai T. Block, Mary Bruno, Graham C. Wiggins, Daniel K. Sodickson
Publikováno v:
Nature Communications, Vol 7, Iss 1, Pp 1-10 (2016)
Magnetic resonance fingerprinting (MRF) requires a uniform B1+ radiofrequency field. Here the authors present plug-n-play MRF, a technique that enables multiparametric imaging with heterogeneous B1+fields, and demonstrate its utility in the presence
Externí odkaz:
https://doaj.org/article/0648c4d8384b47d6a49bf36efa970a64
Autor:
Graham C. Wiggins, Karthik Lakshmanan, Ryan Brown, Riccardo Lattanzi, Martijn A. Cloos, Daniel K. Sodickson
Publikováno v:
Concepts in magnetic resonance. Part B, Magnetic resonance engineering
Purpose. To revisit the “loopole,” an unusual coil topology whose unbalanced current distribution captures both loop and electric dipole properties, which can be advantageous in ultra-high-field MRI. Methods. Loopole coils were built by deliberat
Publikováno v:
Magnetic Resonance in Medicine. 80:2267-2274
Purpose Transmit arrays are essential tools for various RF shimming or parallel excitation techniques at 7T. Here we present an array design with triangular coils to improve diversity in the B1 profiles in the longitudinal (z) direction and allow for
Publikováno v:
Magnetic Resonance in Medicine. 80:822-832
To design a robust and patient friendly radiofrequency coil array (8-channel transmit and 16-channel receive) for cross-sectional body imaging at 7 T, and to improve our understanding of the combination of dipole and loop like elements for ultra high
Publikováno v:
Magnetic Resonance in Medicine. 79:1773-1780
Purpose To describe a new bench measurement based on quality (Q) factors to estimate the coil noise relative to the sample noise of dipole antennas at 7 T. Methods Placing a dipole antenna close to a highly conductive sample surrogate (HCSS) greatly
Autor:
Daniel K. Sodickson, Kai Tobias Block, Graham C. Wiggins, Mary Bruno, Florian Knoll, Tiejun Zhao, Martijn A. Cloos
Publikováno v:
Nature Communications, Vol 7, Iss 1, Pp 1-10 (2016)
Nature Communications
Nature Communications
Magnetic resonance imaging (MRI) has become an unrivalled medical diagnostic technique able to map tissue anatomy and physiology non-invasively. MRI measurements are meticulously engineered to control experimental conditions across the sample. Howeve
Autor:
Ryan Brown, Graham C. Wiggins, Daniel K. Sodickson, Riccardo Lattanzi, Manushka Vaidya, Christopher M. Collins
Publikováno v:
Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering. 46:25-40
In high field MRI, the spatial distribution of the radiofrequency magnetic ( ) field is usually affected by the presence of the sample. For hardware design and to aid interpretation of experimental results, it is important both to anticipate and to a
Autor:
Karthik Lakshmanan, Daniel K. Sodickson, Ravinder R. Regatte, Leeor Alon, Graham C. Wiggins, Ryan Brown, Guillaume Madelin, Gregory Chang
Publikováno v:
Magnetic Resonance in Medicine. 76:1325-1334
Purpose We describe a 2 × 6 channel sodium/proton array for knee MRI at 3T. Multielement coil arrays are desirable because of well-known signal-to-noise ratio advantages over volume and single-element coils. However, low tissue–coil coupling that
Publikováno v:
NMR in Biomedicine. 29:96-106
(23)Na RF coil design for brain and MSK applications presents a number of challenges, including poor coil loading for arrays of small coils and SNR penalties associated with providing (1)H capability with the same coil. The basics of RF coil design a
Autor:
Wyger M. Brink, J. H. F. van Gemert, Jisen Dai, Christopher M. Collins, Gang Chen, Graham C. Wiggins, Andrew G. Webb, J. Paska, Rob Remis
Publikováno v:
2017 International Conference on Electromagnetics in Advanced Applications (ICEAA).
In this work we present a systematic evaluation of the potential of combining dielectric materials with an array of electric dipoles for MRI. Design parameters include the permittivity and length of a dielectric sleeve, as well as the dipole length a