The role of nonlinear gradients in parallel imaging: A k-space based analysis
Article first published online: 26 SEP 2012
Copyright © 2012 Wiley Periodicals, Inc.
Concepts in Magnetic Resonance Part A
Volume 40A, Issue 5, pages 253–267, September 2012
How to Cite
Galiana, G., Stockmann, J. P., Tam, L., Peters, D., Tagare, H. and Constable, R. T. (2012), The role of nonlinear gradients in parallel imaging: A k-space based analysis. Concepts Magn. Reson., 40A: 253–267. doi: 10.1002/cmr.a.21243
- Issue published online: 26 SEP 2012
- Article first published online: 26 SEP 2012
- Manuscript Accepted: 1 SEP 2012
- Manuscript Revised: 13 AUG 2012
- Manuscript Received: 14 MAR 2012
- parallel imaging;
- accelerated imaging;
- nonlinear imaging
Sequences that encode the spatial information of an object using nonlinear gradient fields are a new frontier in MRI, with potential to provide lower peripheral nerve stimulation, windowed fields of view, tailored spatially-varying resolution, curved slices that mirror physiological geometry, and, most importantly, very fast parallel imaging with multichannel coils. The acceleration for multichannel images is generally explained by the fact that curvilinear gradient isocontours better complement the azimuthal spatial encoding provided by typical receiver arrays. However, the details of this complementarity have been more difficult to specify. We present a simple and intuitive framework for describing the mechanics of image formation with nonlinear gradients, and we use this framework to review some the main classes of nonlinear encoding schemes. © 2012 Wiley Periodicals, Inc. Concepts Magn Reson Part A 40A: 253–267, 2012.