Parallel imaging with phase scrambling.

Details

Serval ID
serval:BIB_6EE586DD208C
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Parallel imaging with phase scrambling.
Journal
Magnetic Resonance In Medicine
Author(s)
Zaitsev M., Schultz G., Hennig J., Gruetter R., Gallichan D.
ISSN
1522-2594 (Electronic)
ISSN-L
0740-3194
Publication state
Published
Issued date
04/2015
Peer-reviewed
Oui
Volume
73
Number
4
Pages
1407-1419
Language
english
Notes
Publication types: JOURNAL ARTICLE
Abstract
PURPOSE: Most existing methods for accelerated parallel imaging in MRI require additional data, which are used to derive information about the sensitivity profile of each radiofrequency (RF) channel. In this work, a method is presented to avoid the acquisition of separate coil calibration data for accelerated Cartesian trajectories.
METHODS: Quadratic phase is imparted to the image to spread the signals in k-space (aka phase scrambling). By rewriting the Fourier transform as a convolution operation, a window can be introduced to the convolved chirp function, allowing a low-resolution image to be reconstructed from phase-scrambled data without prominent aliasing. This image (for each RF channel) can be used to derive coil sensitivities to drive existing parallel imaging techniques. As a proof of concept, the quadratic phase was applied by introducing an offset to the x(2) - y(2) shim and the data were reconstructed using adapted versions of the image space-based sensitivity encoding and GeneRalized Autocalibrating Partially Parallel Acquisitions algorithms.
RESULTS: The method is demonstrated in a phantom (1 × 2, 1 × 3, and 2 × 2 acceleration) and in vivo (2 × 2 acceleration) using a 3D gradient echo acquisition.
CONCLUSION: Phase scrambling can be used to perform parallel imaging acceleration without acquisition of separate coil calibration data, demonstrated here for a 3D-Cartesian trajectory. Further research is required to prove the applicability to other 2D and 3D sampling schemes. Magn Reson Med, 2014. © 2014 Wiley Periodicals, Inc.
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Web of science
Create date
23/04/2014 9:45
Last modification date
20/08/2019 14:28
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