High-resolution MRI of the carotid arteries using a leaky waveguide transmitter and a high-density receive array at 7 T

A setup for 7T MRI of the carotid arteries in the neck was designed and constructed. Separate dedicated arrays were used for transmit and receive. For the transmit array, single‐side adapted dipole antennas were mounted on a dielectric pillow, which was shown to serve as a leaky waveguide, efficient...

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Bibliographic Details
Published in:	Magnetic resonance in medicine Vol. 69; no. 4; pp. 1186 - 1193
Main Authors:	Koning, W., Bluemink, J. J., Langenhuizen, E. A. J., Raaijmakers, A. J., Andreychenko, A., van den Berg, C. A. T., Luijten, P. R., Zwanenburg, J. J. M., Klomp, D. W. J.
Format:	Journal Article
Language:	English
Published:	United States Blackwell Publishing Ltd 01-04-2013 Wiley Subscription Services, Inc
Subjects:	carotid arteries Carotid Arteries - anatomy & histology Equipment Design Equipment Failure Analysis high field MRI Humans Image Enhancement - instrumentation Magnetic Resonance Angiography - instrumentation Reproducibility of Results Sensitivity and Specificity Transducers transmit array waveguide
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Summary:	A setup for 7T MRI of the carotid arteries in the neck was designed and constructed. Separate dedicated arrays were used for transmit and receive. For the transmit array, single‐side adapted dipole antennas were mounted on a dielectric pillow, which was shown to serve as a leaky waveguide, efficiently distributing B1 into the neck. Risk assessment was performed by simulations. Phantom measurements were performed to establish optimal positions of the antennas on the pillow. Using two antennas, a dual transmit setup was created. In vivo B1+ maps with different shim configurations were acquired to assess transmit performance. This effective transmit array was used in combination with a dedicated 30 channel small element receive coil. High‐resolution in vivo turbo spin echo images were acquired to demonstrate the excellent performance of the setup. Magn Reson Med 69:1186–1193, 2013. © 2012 Wiley Periodicals, Inc.
Bibliography:	ark:/67375/WNG-BCSXGT98-P ArticleID:MRM24345 istex:106A9410BE0049EEF2918914E7AF1F3F81DE9BAA Center for Translational Molecular Medicine and the Dutch Heart Foundation (PARISk) ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	0740-3194 1522-2594
DOI:	10.1002/mrm.24345