Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 142, Issue 2, Pages 313-322Publisher
ACADEMIC PRESS INC
DOI: 10.1006/jmre.1999.1946
Keywords
tagging; pulse sequences; small tip-angle approximation; k space; presaturation
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We present a k-space approximation that directly relates a pulse sequence to its residual pattern of z-directed magnetization M-z, in a manner akin to the k-space approximation for small tip-angle excitation. Our approximation is particularly useful for the analysis and design of tagging sequences, in which M-z is the important quantity - as opposed to the transverse magnetization components M-x and M-y considered in selective excitation. We demonstrate that our approximation provides new insights into tagging, can be used to design novel tag patterns, and, more generally, may be applied to selective presaturation sequences for purposes other than tagging. (C) 2000 Academic Press.
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