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  Spoiling without additional gradients: Radial FLASH MRI with randomized radiofrequency phases.

Roeloffs, V. B., Voit, D., & Frahm, J. (2016). Spoiling without additional gradients: Radial FLASH MRI with randomized radiofrequency phases. Magnetic Resonance in Medicine, 75(5), 2094-2099. doi:10.1002/mrm.25809.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-AAF5-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-811F-7
Genre: Journal Article

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2167638.pdf (Publisher version), 3MB
 
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 Creators:
Roeloffs, V. B.1, Author              
Voit, D.1, Author              
Frahm, J.1, Author              
Affiliations:
1Biomedical NMR Research GmbH, MPI for Biophysical Chemistry, Max Planck Society, ou_578634              

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Free keywords: RF spoiling; gradient spoiling; Golden Angle; radial MRI; real-time MRI
 Abstract: Purpose To develop a method for spoiling transverse magnetizations without additional gradients to minimize repetition times for radial fast low angle shot (FLASH) MRI. Methods Residual steady state transverse magnetizations and corresponding image artifacts were analyzed for radial gradient echo sequences with constant and randomized RF phases in comparison with a sequence with refocused frequency-encoding gradients, constant spoiler gradient, and conventional RF spoiling (gold standard). The spoiling performance was assessed for different radial trajectories using numerical simulations, phantom experiments, and in vivo MRI studies of the human brain. Results Simulations as well as phantom and in vivo measurements reveal a highly efficient spoiling capacity for randomized RF phases and radial FLASH sequences without the need for gradient rewinding and spoiler gradients. The data also demonstrate a strong dependence of the spoiling performance on the chosen radial trajectory (ie, the azimuthal angular increment between successive projections) with excellent results for an interleaved multiturn scheme. Conclusion Effective spoiling of transverse magnetizations in radial FLASH MRI may be achieved by randomized RF phases without additional spoiler gradients. The technique allows for short repetition times as required for high-speed real-time MRI.

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Language(s): eng - English
 Dates: 2015-06-222016-05
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1002/mrm.25809
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 75 (5) Sequence Number: - Start / End Page: 2094 - 2099 Identifier: -