Evolution of the longitudinal magnetization for pulse sequences using a fast spin-echo readout: Application to fluid-attenuated inversion-recovery and double inversion-recovery sequences
The fast spin‐echo (FSE) sequence is frequently used as a fast data‐readout technique in conjunction with other pulse sequence elements, such as in fluid‐attenuated inversion‐recovery (FLAIR) and double inversion‐recovery (DIR) sequences. In order to implement those pulse sequences, an understanding...
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Published in | Magnetic resonance in medicine Vol. 54; no. 1; pp. 241 - 245 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Hoboken
Wiley Subscription Services, Inc., A Wiley Company
01.07.2005
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Subjects | |
Online Access | Get full text |
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Summary: | The fast spin‐echo (FSE) sequence is frequently used as a fast data‐readout technique in conjunction with other pulse sequence elements, such as in fluid‐attenuated inversion‐recovery (FLAIR) and double inversion‐recovery (DIR) sequences. In order to implement those pulse sequences, an understanding is required of how the longitudinal magnetization evolves during the FSE part of the sequence. This evolution has been addressed to a certain extent by previous publications, but the DIR literature in particular appears to be replete with approximations to the exact expression for the longitudinal magnetization, and several papers contain errors. Equations are therefore presented here for the evolution of the longitudinal magnetization for a FSE readout. These are then applied to calculate the magnetization available immediately prior to the 90° imaging pulse for the FLAIR‐FSE and DIR‐FSE pulse sequences. Magn Reson Med 54:241–245, 2005. © 2005 Wiley‐Liss, Inc. |
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Bibliography: | istex:7AAE77B8F63EB04C5A8337A694CC5D581CA05984 ArticleID:MRM20541 ark:/67375/WNG-Q153NZ8R-Z ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0740-3194 1522-2594 |
DOI: | 10.1002/mrm.20541 |