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Excitation UNFOLD (XUNFOLD) to improve the temporal resolution of multishot tailored RF pulses
Author(s) -
Stenger V. Andrew,
Giurgi Marius S.,
Boada Fernando E.,
Noll Douglas C.
Publication year - 2006
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.21000
Subject(s) - aliasing , temporal resolution , excitation , dimension (graph theory) , computer science , image resolution , resolution (logic) , fourier transform , time domain , optics , nuclear magnetic resonance , artificial intelligence , physics , computer vision , filter (signal processing) , mathematics , quantum mechanics , pure mathematics
An extension of the “UNaliasing by Fourier encoding the Overlaps using the temporaL Dimension” (UNFOLD) method to the excitation domain (XUNFOLD) is presented to improve the temporal resolution of multishot tailored RF (TRF) pulses. Multishot three‐dimensional TRF pulses were designed to produce a time series of images with periodically aliased excitation profiles. The XUNFOLD method is shown to remove the excitation profile aliasing from the dynamic imaging data by filtering in the temporal frequency dimension. The technique is demonstrated to improve the temporal resolution of simulated functional MRI (fMRI) activation in a time series of brain images. Magn Reson Med, 2006. © 2006 Wiley‐Liss, Inc.