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  A low power radiofrequency pulse for simultaneous multislice excitation and refocusing

Eichner, C., Wald, L. L., & Setsompop, K. (2014). A low power radiofrequency pulse for simultaneous multislice excitation and refocusing. Magnetic Resonance in Medicine, 72(4), 949-958. doi:10.1002/mrm.25389.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-4220-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-B0A1-F
Genre: Journal Article

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 Creators:
Eichner, Cornelius1, 2, Author              
Wald, Lawrence L.2, Author
Setsompop, Kawin2, Author
Affiliations:
1Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634550              
2Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA, ou_persistent22              

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Free keywords: SMS; blipped CAIPI; Multiband; PINS; RF pulse design
 Abstract: Purpose: Simultaneous multislice (SMS) acquisition enables increased temporal efficiency of MRI. Nonetheless, MultiBand (MB) radiofrequency (RF) pulses used for SMS can cause large energy deposition. Power independent of number of slices (PINS) pulses reduce RF power at cost of reduced bandwidth and increased off-resonance dependency. This work improves PINS design to further reduce energy deposition, off-resonance dependency and peak power. Theory and Methods: Modifying the shape of MB RF-pulses allows for mixing with PINS excitation, creating a new pulse type with reduced energy deposition and SMS excitation characteristics. Bloch Simulations were used to evaluate excitation and off-resonance behavior of this MultiPINS pulse. In this work, MultiPINS was used for whole-brain MB=3 acquisition of high angular and spatial resolution diffusion MRI at 7 Tesla in 3 min. Results: By using MultiPINS, energy transmission and peak power for SMS imaging can be significantly reduced compared with PINS and MB pulses. For MB=3 acquisition in this work, MultiPINS reduces energy transmission by up to approximate to 50% compared with PINS pulses. The energy reduction was traded off to shorten the MultiPINS pulse, yielding higher signal at off-resonances for spin-echo acquisitions. Conclusion: MB and PINS pulses can be combined to enable low energy and peak power SMS acquisition.

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Language(s): eng - English
 Dates: 2014-07-082014-01-202014-07-082014-08-072014-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/mrm.25389
PMID: 25103999
Other: Epub 2014
 Degree: -

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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: 72 (4) Sequence Number: - Start / End Page: 949 - 958 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149