128-channel body MRI with a flexible high-density receiver-coil array

Purpose To determine whether the promise of high‐density many‐coil MRI receiver arrays for enabling highly accelerated parallel imaging can be realized in practice. Materials and Methods A 128‐channel body receiver‐coil array and custom MRI system were developed. The array comprises two clamshells c...

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Bibliographic Details
Published in:	Journal of magnetic resonance imaging Vol. 28; no. 5; pp. 1219 - 1225
Main Authors:	Hardy, Christopher J., Giaquinto, Randy O., Piel, Joseph E., Rohling AAS, Kenneth W., Marinelli, Luca, Blezek, Daniel J., Fiveland, Eric W., Darrow, Robert D., Foo, Thomas K.F.
Format:	Journal Article
Language:	English
Published:	Hoboken Wiley Subscription Services, Inc., A Wiley Company 01-11-2008
Subjects:	128 channels body MRI Equipment Design Equipment Failure Analysis Humans Image Enhancement - instrumentation Magnetic Resonance Imaging - instrumentation Magnetics - instrumentation MRI receiver coil arrays multichannel MRI parallel MRI Phantoms, Imaging Reproducibility of Results Sensitivity and Specificity Transducers Whole Body Imaging - instrumentation
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Summary:	Purpose To determine whether the promise of high‐density many‐coil MRI receiver arrays for enabling highly accelerated parallel imaging can be realized in practice. Materials and Methods A 128‐channel body receiver‐coil array and custom MRI system were developed. The array comprises two clamshells containing 64 coils each, with the posterior array built to maximize signal‐to‐noise ratio (SNR) and the anterior array design incorporating considerations of weight and flexibility as well. Phantom imaging and human body imaging were performed using a variety of reduction factors and 2D and 3D pulse sequences. Results The ratio of SNR relative to a 32‐element array of similar footprint was 1.03 in the center of an elliptical loading phantom and 1.7 on average in the outer regions. Maximum g‐factors dropped from 5.5 (for 32 channels) to 2.0 (for 128 channels) for 4 × 4 acceleration and from 25 to 3.3 for 5 × 5 acceleration. Residual aliasing artifacts for a right/left (R/L) reduction factor of 8 in human body imaging were significantly reduced relative to the 32‐channel array. Conclusion MRI with a large number of receiver channels enables significantly higher acceleration factors for parallel imaging and improved SNR, provided losses from the coils and electronics are kept negligible. J. Magn. Reson. Imaging 2008;28:1219–1225. © 2008 Wiley‐Liss, Inc.
Bibliography:	This work was presented in part at the 15th Annual Meeting of ISMRM, Berlin, Germany, 2007. istex:006BF943404F18F97AB7999AEC7E550AEB6918D7 ArticleID:JMRI21463 ark:/67375/WNG-9ZV5BXK8-L ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1053-1807 1522-2586
DOI:	10.1002/jmri.21463