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Comparing the FAISE method with conventional dual‐echo sequences
Author(s) -
Melki Philippe S.,
Mulkern Robert V.,
Panych Lawrence P.,
Jolesz Ferenc A.
Publication year - 1991
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880010310
Subject(s) - weighting , spin echo , echo (communications protocol) , nuclear magnetic resonance , computer science , image contrast , fast spin echo , scanner , contrast (vision) , physics , materials science , artificial intelligence , magnetic resonance imaging , acoustics , radiology , medicine , computer network
The FAISE (fast‐acquisition interleaved spin‐echo) technique consists of a hybrid rapid‐acquisition relaxation‐enhanced (RARE) sequence combined with a specific phase‐encode reordering method. Implemented on a 1.5‐T unit, this multisection, high‐resolution technique permits convenient contrast manipulation similar to that of spin‐echo imaging, with selection of a pseudo‐echo‐time parameter and a TR interval. With a TR of 2 seconds, eight 256 × 256 images are obtained in 34 seconds with either T2 or proton‐density weighting. A direct comparison between FAISE and spin echo for obtaining T2‐weighted head images in healthy subjects indicates that FAISE and spin‐echo images are qualitatively and quantitatively similar. Image artifacts are more pronounced on “proton‐density” FAISE images than on the T2‐weighted FAISE images. T1 contrast can be obtained with inversion recovery and short TR FAISE images. Preliminary temperature measurements in saline phantoms do not indicate excessive temperature increases with extended FAISE acquisitions. However, extensive studies of radio‐frequency power deposition effects should be performed if the FAISE technique is to be fully exploited.