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Phase Constrained Encoding (PACE): A Technique for MRI in Large Static Field Inhomogeneities
Author(s) -
Kim Jae K.,
Plewes Donald B.,
Mark Henkelman R.
Publication year - 1995
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910330407
Subject(s) - magnetization , physics , phase (matter) , rotation (mathematics) , magnetostatics , nuclear magnetic resonance , encoding (memory) , spin echo , point (geometry) , field (mathematics) , magnetic field , computer science , magnetic resonance imaging , computational physics , mathematics , artificial intelligence , medicine , geometry , quantum mechanics , pure mathematics , radiology
In spin echo imaging, magnetization is assigned to a location defined by its frequency of rotation. In the presence of a static magnetic field inhomogeneity, however, this location does not correspond to the true location of the magnetization. This paper describes a magnetic resonance imaging technique called phase constrained encoding (PACE) that assigns magnetization to its true location through the use of a spin echotrain and alternating readout gradients. Small artifactual sidebands occur in the point spread function but can be minimized or eliminated using higher gradient strengths, more echoes, and/or additional acquisitions. Implementation of a simple version of this technique confirms simulations.