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Multiple‐spin‐echo imaging with a 2D Fourier method
Author(s) -
Graumann R.,
Oppelt A.,
Stetter E.
Publication year - 1986
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.1910030507
Subject(s) - echo (communications protocol) , spin echo , nuclear magnetic resonance , echo planar imaging , fourier transform , physics , fast spin echo , pulse sequence , echo time , fourier analysis , magnetic resonance imaging , optics , phase (matter) , sequence (biology) , computer science , chemistry , medicine , computer network , biochemistry , quantum mechanics , radiology
In 2D Fourier imaging the normal Carr‐Purcell multiple‐echo sequence generally leads to center line and mirror artifacts caused by imperfect rotations by the rf pulses. We describe a method to avoid these distortions using a phase alternating‐ p hase shift (PHAPS) sequence which also allows multiple‐slice and multiple‐echo imaging at the same time. Measuring phantoms with calibrated T 2 values, we have shown that the PHAPS imaging sequence leads to an accuracy of quantitative T 2 determinations of better than 10%. Contrast‐enhanced images are presented which we calculated from multiple‐echo images and extrapolated to arbitrary echotimes, including negative ones. We believe that these improvements in T 2 imaging will result in a significant reduction of patient investigation time in magnetic resonance imaging. © 1986 Academic Press, Inc.