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Wavelet‐encoded MR imaging
Author(s) -
Weaver John B.,
Xu Yansun,
Healy Dennis M.,
Driscoll James R.
Publication year - 1992
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.1910240209
Subject(s) - wavelet , encoding (memory) , wavelet packet decomposition , wavelet transform , computer science , translation (biology) , projection (relational algebra) , artificial intelligence , nuclear magnetic resonance , mathematics , physics , algorithm , chemistry , biochemistry , messenger rna , gene
Wavelet encoding is presented and compared to phase encoding. In wavelet encoding a distribution of spins is excited by a slice selective RF pulse; for each repetition time the distribution excited has the profile of a wavelet at different scale and translation. The spin density can be reconstructed with an inverse wavelet transform. Wavelet encoding has three advantages over phase encoding: (1) there is no Gibblquot's ringing from partial volume effects, (2) the effective repetition time can be 36 times the repetition time for a 256 × 256 image, and (3) motion artifacts are local and dramatically reduced. Using wavelet encoding, a 256 × 256 T 2 ‐weighted projection image can be acquired in 33s. © 1992 Academic Press, Inc.