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Multishot 3D slice‐select tailored RF pulses for MRI
Author(s) -
Stenger V. Andrew,
Boada Fernando E.,
Noll Douglas C.
Publication year - 2002
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.10194
Subject(s) - dephasing , imaging phantom , pulse (music) , wafer , optics , materials science , physics , radio frequency , nuclear magnetic resonance , voxel , resolution (logic) , computer science , artificial intelligence , optoelectronics , telecommunications , quantum mechanics , detector
A multishot 3D slice‐select tailored RF pulse method is presented for the excitation of slice profiles with arbitrary resolution. This method is derived from the linearity of the small tip angle approximation, allowing for the decomposition of small tip angle tailored RF pulses into separate excitations. The final image is created by complex summation of the images acquired from the individual excitations. This technique overcomes the limitation of requiring a long pulse to excite thin slices with adequate resolution. This has implications in applications including T * 2 ‐weighted functional MRI in brain regions corrupted by intravoxel dephasing artifacts due to susceptibility variations. Simulations, phantom experiments, and human brain images are presented. It is demonstrated that at most four shots of 40 ms pulse length are needed to excite a 5 mm‐thick slice in the brain with reduced susceptibility artifacts at 3T. Magn Reson Med 48:157–165, 2002. © 2002 Wiley‐Liss, Inc.