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  Direct FLASH MR imaging of magnetic field inhomogeneities by gradient compensation.

Frahm, J., Merboldt, K. D., & Hänicke, W. (1988). Direct FLASH MR imaging of magnetic field inhomogeneities by gradient compensation. Magnetic Resonace in Medicine, 6(4), 474-480. doi:10.1002/mrm.1910060412.

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 Creators:
Frahm, J.1, Author              
Merboldt, K. D.2, Author              
Hänicke, W.2, Author              
Affiliations:
1Research Group of Biomedical NMR, MPI for Biophysical Chemistry, Max Planck Society, ou_578633              
2Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society, ou_578634              

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 Abstract: MR images based on gradient echoes are sensitive to artifacts caused by inhomogeneities of the static magnetic field. This paper describes the effects of local gradients in rapid FLASH MR images and presents a way of directly imaging affected areas. The idea is to compensate for signal losses due to mutual cancellation of dephased magnetizations by deliberate “misadjustments” of the refocusing part of the slice selection gradient. In contrast to conventional field imaging techniques no three-dimensional data acquisition or subsequent Fourier analysis is required to obtain images at a particular gradient strength. Conventional as well as inhomogeneity compensated FLASH images have been obtained on phantoms and human heads using a 2.35-T 40-cm magnet and a 1.5-T whole-body system, respectively.

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Language(s): eng - English
 Dates: 1988-04
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1002/mrm.1910060412
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Title: Magnetic Resonace in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 6 (4) Sequence Number: - Start / End Page: 474 - 480 Identifier: -