A simple method for investigating the effects of non-uniformity of radiofrequency transmission and radiofrequency reception in MRI

Barker, G. J., Simmons, A., Arridge, S. R. and Tofts, P. S. (1998) A simple method for investigating the effects of non-uniformity of radiofrequency transmission and radiofrequency reception in MRI. British Journal of Radiology, 71 (841). pp. 59-67. ISSN 0007-1285

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Abstract

Inhomogeneity of the transmitted or received B1 field leads to intensity variations in MR images and spatial dependence in apparent concentration in MR spectra. We describe a simple method for investigating such variations. The transmitted B1 field can be measured both in vivo and in vitro which allows investigation of sample dependent effects that can not be measured on phantoms. For homogeneous regions the method also allows the received B1 field to be measured both in vivo and in vitro. Our method uses only a standard spin echo pulse sequence and simple region of interest analysis and should be implementable on any commercial scanner. The method is demonstrated using a variety of transmission and reception radiofrequency coils both in vivo and in vitro.

Item Type: Article
Keywords: Head/anatomy & histology Humans Magnetic Resonance Imaging/instrumentation/ methods Models, Theoretical Phantoms, Imaging Radio Waves Spine/anatomy & histology
Schools and Departments: Brighton and Sussex Medical School > Brighton and Sussex Medical School
Depositing User: Paul Stephen Tofts
Date Deposited: 28 Feb 2007
Last Modified: 11 Jun 2012 12:42
URI: http://sro.sussex.ac.uk/id/eprint/828
Google Scholar:62 Citations
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