Phased Array Optimized for Simultaneous Reception with a Transmit Volume Coil 
for SNR Improvement of the Spectroscopic Imaging of the Hippocampus

Avdievich, NI; Hetherington, HP

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Phased Array Optimized for Simultaneous Reception with a Transmit Volume Coil for SNR Improvement of the Spectroscopic Imaging of the Hippocampus

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https://cds.ismrm.org/ismrm-2007/files/00447.pdf
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Avdievich, N., & Hetherington, H. (2005). Phased Array Optimized for Simultaneous Reception with a Transmit Volume Coil for SNR Improvement of the Spectroscopic Imaging of the Hippocampus. In 13th Scientific Meeting of the International Society of Magnetic Resonance in Medicine (ISMRM 2005).

Cite as: https://hdl.handle.net/21.11116/0000-0005-41D3-3

Abstract

A common way to improve SNR for spectroscopic studies from restricted regions is by using a transmit-only volume coil with a receive-only surface coil phased array (1). Improved sensitivity in the medial temporal lobes is critical for the accurate measurement of low concentration neurotransmitters such as GABA. Although phased arrays have superior SNR near the array, it has not been possible to achieve substantial SNR increases in comparison to volume coils from the central regions of the brain such as the hippocampi (2). Substantial improvements of the SNR near the center of the head can be obtained if the volume transmit coil is also used for reception. Previously Hyde used a volume coil and a single surface coil for simultaneous reception demonstrating improved SNR (3). To avoid interactions between the two coils, a counter rotating current (CRC) surface coil consisting of two parallel rings carrying opposite currents (4) was used. Recently simultaneous reception for improved sensitivity in the center of the human brain has been reported using a volume coil and a CRC array (5). In this work we developed a 6-channel CRC phased array optimized for the hippocampus and capable of receiving simultaneously with a head-sized volume coil.