High-Field Actively Detuneable Transverse Electromagnetic (TEM) Coil with Low 
Bias Voltage for High Power RF Transmission

Avdievich, NI; Bradshaw, K; Kuznetsov, AM; Hetherington, HP

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Meeting Abstract

High-Field Actively Detuneable Transverse Electromagnetic (TEM) Coil with Low Bias Voltage for High Power RF Transmission

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https://cds.ismrm.org/ismrm-2007/files/1_program.pdf
(Abstract)

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Citation

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).

Cite as: https://hdl.handle.net/21.11116/0000-0004-49F9-2

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.