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Eight-channel phased array coil and detunable TEM volume coil for 7 T brain imaging

✍ Scribed by G. C. Wiggins; A. Potthast; C. Triantafyllou; C. J. Wiggins; L. L. Wald

Book ID
102533648
Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
478 KB
Volume
54
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

An eight‐channel receive‐only brain coil and table‐top detunable volume transmit coil were developed and tested at 7 T for human imaging. Optimization of this device required attention to sources of interaction between the array elements, between the transmit and receive coils and minimization of common mode currents on the coaxial cables. Circular receive coils (85 mm dia.) were designed on a flexible former to fit tightly around the head and within a 270‐mm diameter TEM transmit volume coil. In the near cortex, the array provided a fivefold increase in SNR compared to a TEM transmit‐receive coil, a gain larger than that seen in comparable coils at 3 T. The higher SNR gain is likely due to strong dielectric effects, which cause the volume coil to perform poorly in the cortex compared to centrally. The sensitivity and coverage of the array is demonstrated with high‐resolution images of the brain cortex. Magn Reson Med 54:235–240, 2005. © 2005 Wiley‐Liss, Inc.

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