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Journal Article

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

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Frahm,  J.
Research Group of Biomedical NMR, MPI for Biophysical Chemistry, Max Planck Society;

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Merboldt,  K. D.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Hänicke,  W.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Citation

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.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-E71D-6
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.