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Partial discrete Fourier transform (PDFT) multiband encoding
Author(s) -
Cunningham Charles H.,
Stainsby Jeffrey A.,
Wright Graham A.,
Wood Michael L.
Publication year - 2001
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(200101)45:1<118::aid-mrm1016>3.0.co;2-s
Subject(s) - encoding (memory) , hadamard transform , algorithm , discrete fourier transform (general) , fourier transform , computer science , phase (matter) , sensitivity (control systems) , fast fourier transform , fourier analysis , physics , mathematics , artificial intelligence , fractional fourier transform , mathematical analysis , electronic engineering , quantum mechanics , engineering
For conventional multiband encoding techniques such as Hadamard encoding, scan time scales linearly with the number of slices encoded simultaneously. In this work, a new multiband encoding technique called partial discrete Fourier transform (PDFT) encoding is introduced, which overcomes this restriction. This technique incorporates the principle of partial Fourier imaging, allowing the tradeoff of SNR and imaging time without changing the number of slices. The theory behind PDFT encoding and its inherent sensitivity to phase errors are outlined. The theory was validated through simulations, showing that phase errors result in degraded slice localization. The feasibility of PDFT encoding of 12 slices was tested with experimental excitation profile measurements and heart images of a human subject using commercial MRI equipment. Imaging time was reduced to 66% with SNR reduced to 82%. Magn Reson Med 45:118–127, 2001. © 2001 Wiley‐Liss, Inc.