Spectrally selective B1-insensitive T2 magnetization preparation sequence.
Details
Serval ID
serval:BIB_B9CE05FB1ABB
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Spectrally selective B1-insensitive T2 magnetization preparation sequence.
Journal
Magnetic Resonance In Medicine
ISSN
1522-2594[electronic], 0740-3194[linking]
Publication state
Published
Issued date
2009
Volume
61
Number
6
Pages
1326-1335
Language
english
Notes
Publication types: Journal Article ; Research Support, N.I.H., Extramural
Publication Status: ppublish
Publication Status: ppublish
Abstract
A T(2) magnetization-preparation (T(2) Prep) sequence is proposed that is insensitive to B(1) field variations and simultaneously provides fat suppression without any further increase in specific absorption rate (SAR). Increased B(1) inhomogeneity at higher magnetic field strength (B(0) > or = 3T) necessitates a preparation sequence that is less sensitive to B(1) variations. For the proposed technique, T(2) weighting in the image is achieved using a segmented B(1)-insensitive rotation (BIR-4) adiabatic pulse by inserting two equally long delays, one after the initial reverse adiabatic half passage (AHP), and the other before the final AHP segment of a BIR-4 pulse. This sequence yields T(2) weighting with both B(1) and B(0) insensitivity. To simultaneously suppress fat signal (at the cost of B(0) insensitivity), the second delay is prolonged so that fat accumulates additional phase due to its chemical shift. Numerical simulations as well as phantom and in vivo image acquisitions were performed to show the efficacy of the proposed technique.
Keywords
Algorithms, Brain/anatomy & histology, Brain Chemistry, Humans, Image Interpretation, Computer-Assisted/methods, Magnetic Resonance Imaging/instrumentation, Magnetic Resonance Imaging/methods, Magnetic Resonance Spectroscopy/methods, Phantoms, Imaging, Radio Waves, Signal Processing, Computer-Assisted
Pubmed
Web of science
Open Access
Yes
Create date
02/03/2010 16:04
Last modification date
20/08/2019 15:27