This work was presented in part at the 15th Annual Meeting of ISMRM, Berlin, Germany, 2007.
128-channel body MRI with a flexible high-density receiver-coil array†
Article first published online: 28 OCT 2008
Copyright © 2008 Wiley-Liss, Inc.
Journal of Magnetic Resonance Imaging
Volume 28, Issue 5, pages 1219–1225, November 2008
How to Cite
Hardy, C. J., Giaquinto, R. O., Piel, J. E., Rohling AAS, K. W., Marinelli, L., Blezek, D. J., Fiveland, E. W., Darrow, R. D. and Foo, T. K.F. (2008), 128-channel body MRI with a flexible high-density receiver-coil array. J. Magn. Reson. Imaging, 28: 1219–1225. doi: 10.1002/jmri.21463
- Issue published online: 28 OCT 2008
- Article first published online: 28 OCT 2008
- Manuscript Accepted: 9 MAY 2008
- Manuscript Received: 10 JAN 2008
- MRI receiver coil arrays;
- parallel MRI;
- body MRI;
- multichannel MRI;
- 128 channels
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.
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.
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.