Direct imaging of radio-frequency modes via traveling wave magnetic resonance imaging

Research output: Contribution to journalArticle

Abstract

We demonstrate an experimental method for direct 2D and 3D imaging of magnetic radio-frequency (rf) field distribution in metal-dielectric structures based on traveling wave (TW) magnetic resonance imaging (MRI) at ultra-high field (>7 T). The typical apparatus would include an ultra-high field whole body or small bore MRI scanner, waveguide elements filled with MRI active dielectrics with predefined electric and magnetic properties, and TW rf transmit-receive probes. We validated the technique by obtaining TW MR images of the magnetic field distribution of the rf modes of circular waveguide filled with deionized water in a 16.4 T small-bore MRI scanner and compared the MR images with numerical simulations. Our MRI technique opens up a practical non-perturbed way of imaging of previously inaccessible rf field distribution of modes inside various shapes metal waveguides with inserted dielectric objects, including waveguide mode converters and transformers.

Original languageEnglish (US)
Article number024904
JournalJournal of Applied Physics
Volume119
Issue number2
DOIs
StatePublished - Jan 14 2016

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traveling waves
magnetic resonance
radio frequencies
waveguides
scanners
circular waveguides
cavities
imaging techniques
transformers
metals
converters
magnetic properties
probes
magnetic fields
water
simulation

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Direct imaging of radio-frequency modes via traveling wave magnetic resonance imaging. / Tonyushkin, A.; Deelchand, Dinesh K; Van de Moortele, Pierre-Francois; Adriany, Gregor; Kiruluta, A.

In: Journal of Applied Physics, Vol. 119, No. 2, 024904, 14.01.2016.

Research output: Contribution to journalArticle

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