Adaptive Cylindrical Wireless Metasurfaces in Clinical Magnetic Resonance Imaging

2021 ◽  
pp. 2102469
Author(s):  
Zhonghai Chi ◽  
Yi Yi ◽  
Yakui Wang ◽  
Maopeng Wu ◽  
Lixue Wang ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Clinical Magnetic Resonance Imaging

scholarly journals Numerical Analysis of a Flexible Dual Loop Coil and its Experimental Validation for pre-Clinical Magnetic Resonance Imaging of Rodents at 7 T

2016 ◽  
Vol 16 (6) ◽  
pp. 294-299 ◽  
Author(s):  
S. Solis-Najera ◽  
F. Vazquez ◽  
R. Hernandez ◽  
O. Marrufo ◽  
A.O. Rodriguez
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Imaging System ◽  
Ex Vivo ◽  
Small Animal ◽  
Magnetic Resonance Imaging System ◽  
External Diameter ◽  
Rf Coil ◽  
Resonance Imaging ◽  
Clinical Magnetic Resonance Imaging

Abstract A surface radio frequency coil was developed for small animal image acquisition in a pre-clinical magnetic resonance imaging system at 7 T. A flexible coil composed of two circular loops was developed to closely cover the object to be imaged. Electromagnetic numerical simulations were performed to evaluate its performance before the coil construction. An analytical expression of the mutual inductance for the two circular loops as a function of the separation between them was derived and used to validate the simulations. The RF coil is composed of two circular loops with a 5 cm external diameter and was tuned to 300 MHz and 50 Ohms matched. The angle between the loops was varied and the Q factor was obtained from the S11 simulations for each angle. B1 homogeneity was also evaluated using the electromagnetic simulations. The coil prototype was designed and built considering the numerical simulation results. To show the feasibility of the coil and its performance, saline-solution phantom images were acquired. A correlation of the simulations and imaging experimental results was conducted showing a concordance of 0.88 for the B1 field. The best coil performance was obtained at the 90° aperture angle. A more realistic phantom was also built using a formaldehyde-fixed rat phantom for ex vivo imaging experiments. All images showed a good image quality revealing clearly defined anatomical details of an ex vivo rat.

Image Artifact Management for Clinical Magnetic Resonance Imaging on a 7 T Scanner Using Single-Channel Radiofrequency Transmit Mode

2019 ◽  
Vol 54 (12) ◽  
pp. 781-791 ◽  
Author(s):  
Andrew J. Fagan ◽  
Kirk M. Welker ◽  
Kimberly K. Amrami ◽  
Matthew A. Frick ◽  
Robert E. Watson ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Single Channel ◽  
Resonance Imaging ◽  
Image Artifact ◽  
Clinical Magnetic Resonance Imaging

scholarly journals Brian Stewart Worthington. 9 June 1938 — 9 December 2007

2013 ◽  
Vol 59 ◽  
pp. 423-435 ◽  
Author(s):  
Sir Peter Mansfield ◽  
Eric J. Roebuck
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Medical School ◽  
Family Relationship ◽  
Grammar School ◽  
Resonance Imaging ◽  
Academically Talented ◽  
Clinical Magnetic Resonance Imaging ◽  
The University ◽  
Close Family

Brian Worthington was born into modest circumstances in Oldham and attended the local primary school, from which he moved to Hulme Grammar School, where he studied until he was 18 years of age. He was academically talented and attained the standard to enter university and indeed medical school with a scholarship to Guy’s Hospital in London. He graduated in physiology and medicine and was drawn towards radiology and in particular neuroradiology. He became a consultant for the Nottingham and Derby hospitals, but followed that with a university career as a Professor of Diagnostic Radiology at the University of Nottingham. He was a pioneer in clinical magnetic resonance imaging, for which he was honoured in many ways. Moreover, Brian Worthington was fascinated in all things Icelandic and became a fluent speaker in that language. With his wife Margaret and two sons, Andrew and Stuart, he maintained a close family relationship with his parents.

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