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  High-field actively detuneable transverse electromagnetic (TEM) coil with low-bias voltage for high-power RF transmission

Avdievich, N., Bradshaw, K., Kuznetsov, A., & Hetherington, H. (2007). High-field actively detuneable transverse electromagnetic (TEM) coil with low-bias voltage for high-power RF transmission. Magnetic Resonance in Medicine, 57(6), 1190-1195. doi:10.1002/mrm.21242.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-CB28-C Version Permalink: http://hdl.handle.net/21.11116/0000-0003-CB29-B
Genre: Journal Article

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Avdievich, NI1, Author              
Bradshaw, K, Author
Kuznetsov, AM, Author
Hetherington , HP, Author
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1External Organizations, ou_persistent22              

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 Abstract: The design and construction of a 4T (170 MHz) transverse electromagnetic (TEM) actively detuneable quadrature head coil is described. Conventional schemes for active detuning require high negative bias voltages (>300 V) to prevent leakage of RF pulses with amplitudes of 1–2 kW. To extend the power handling capacity and avoid the use of high DC bias voltages, we developed an alternate method of detuning the volume coil. In this method the PIN diodes in the detuning circuits are shorted when the RF volume coil is tuned, and negatively biased with –12 V when the coil is detuned. To preserve the high QU/QL ratio of the TEM coil, we modified the method of Nabetani and Watkins (Proceedings of the 13th Annual Meeting of ISMRM, Kyoto, Japan, 2004, abstract 1574) by utilizing a high‐impedance (∼200 Ω), lumped‐element, quarter‐wavelength transformer. A QU of 500 was achieved for the detuneable TEM, such that incorporation of the detuning network had minimal effect (<1 dB) on the performance of the coil in vivo.

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 Dates: 2007-06
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/mrm.21242
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: 57 (6) Sequence Number: - Start / End Page: 1190 - 1195 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149