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MRI by steering resonance through space.
- Source :
-
Magnetic resonance in medicine [Magn Reson Med] 2014 Jul; Vol. 72 (1), pp. 49-58. Date of Electronic Publication: 2013 Aug 01. - Publication Year :
- 2014
-
Abstract
- Purpose: This work introduces a technique to excite MR signals locally and to steer this localized region over the object in a spatiotemporal manner. The purpose is to demonstrate the feasibility of MRI with multidimensional spatiotemporal-encoding in a way that provides the ability to compensate extreme field inhomogeneity.<br />Methods: The method is called steering resonance over the object (STEREO). A modulated gradient is applied in concert with a frequency-modulated pulse to steer a resonant region through space and thus produce sequential excitation and echo formation. Images are reconstructed using exclusively an inverse problem solution.<br />Results: Images of phantoms and human brain were produced to demonstrate the feasibility of the STEREO sequence and image reconstruction. Simulations support the postulated capability to compensate for extreme field inhomogeneity.<br />Conclusion: STEREO represents a substantial departure from conventional MRI in which spins contained in the sample, slab, or slice are excited synchronously. By exciting spins sequentially along a curved spatial trajectory, STEREO in principle affords a unique opportunity to adjust for spatial variations in static and radiofrequency fields. By adjusting field amplitudes and frequencies in a temporal manner in STEREO, in future works it should be possible to perform MRI with highly inhomogeneous fields.<br /> (Copyright © 2013 Wiley Periodicals, Inc.)
Details
- Language :
- English
- ISSN :
- 1522-2594
- Volume :
- 72
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Magnetic resonance in medicine
- Publication Type :
- Academic Journal
- Accession number :
- 23913527
- Full Text :
- https://doi.org/10.1002/mrm.24888