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Interactive fast spin‐echo imaging
Author(s) -
Busse Reed F.,
Riederer Stephen J.,
Fletcher Joel G.,
Bharucha Adil E.,
Brandt Kathy R.
Publication year - 2000
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 - 10.1002/1522-2594(200009)44:3<339::aid-mrm1>3.0.co;2-n
Subject(s) - contrast (vision) , echo (communications protocol) , spin echo , computer science , fast spin echo , computer vision , nuclear magnetic resonance , temporal resolution , physics , artificial intelligence , algorithm , magnetic resonance imaging , optics , medicine , radiology , computer network
It is shown that a spin‐echo sequence may be used to acquire T 2 ‐weighted, high‐resolution, high‐SNR sections at quasi‐real‐time frame rates for interactive, diagnostic imaging. A single‐shot fast spin‐echo sequence was designed which employs driven equilibrium to realign transverse magnetization remaining at the final spin echo. Driven equilibrium is shown to improve T 2 contrast at a given TR, or conversely to reduce TR by approximately 1000 msec and thus increase temporal resolution while maintaining a given level of contrast. Wiener demodulation of k ‐space data prior to reconstruction is shown to reduce blurring caused by T 2 ‐decay while constraining noise often associated with other inverse filters. Images are continuously acquired, reconstructed, and displayed at rates of one image every one to two seconds, while section position and contrast may be altered interactively. The clinical utility of this method is demonstrated with applications to dynamic pelvic floor imaging and interactive obstetric imaging. Magn Reson Med 44:339–348, 2000. © 2000 Wiley‐Liss, Inc.