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Optimum acquisition times of two spin echoes for MR image synthesis
Author(s) -
Lee James N.,
Riederer Stephen J.
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.1910030416
Subject(s) - noise (video) , echo (communications protocol) , spin echo , echo time , physics , nuclear magnetic resonance , repetition (rhetorical device) , computer science , image (mathematics) , magnetic resonance imaging , artificial intelligence , philosophy , medicine , computer network , linguistics , radiology
Abstract Spin‐echo images can be synthesized at arbitrary values of echo time T Es if two images are acquired at the same repetition time and two different echo times T EI and T E2 . Depending on the value of T Es , the noise in the synthetic images can either be greater or less than the acquisition noise. This note shows that if the time between the acquired echoes T E2 ‐ T E1 is equal to T 2 , the noise level in the synthetic images is no larger than the acquisition noise for T Es ⩾ T E1 . This is the lowest possible noise bound for two‐echo acquisition. Also, the noise bound for images synthesized with O ⩽ T Es ⩽ T E1 is minimized by making T E1 as short as possible. © 1986 Academic Press, Inc.