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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. In 2007 Joint Annual Meeting ISMRM-ESMRMB (pp. 56).

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-49F9-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-49FA-1
Genre: Meeting Abstract

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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: Conventional schemes for active detuning of volume coils require high negative bias vo ltages (>300V) to prevent distortion of RF pulses at power levels of 1-2 kW. To extend the power handling capacity and avoid using high DC bias voltages we developed an alternative method of detuning. In this method the PIN diodes in the detuning circuits are shorted when the coil is tuned and negatively biased with -12 V when the coil is detuned. To preserve the high QU of the TEM and, therefore, the coil’s performance, a high impedance (~200 Ω) lump-element quarter wavele ngth transformer was utilized.

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 Dates: 2007-05
 Publication Status: Published online
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Title: 2007 Joint Annual Meeting ISMRM-ESMRMB
Place of Event: Berlin, Germany
Start-/End Date: 2007-05-19 - 2007-05-25

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Title: 2007 Joint Annual Meeting ISMRM-ESMRMB
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 238 Start / End Page: 56 Identifier: -