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Direct FLASH MR imaging of magnetic field inhomogeneities by gradient compensation
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. © 1988 Academic Press, Inc.
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Metadata
- Authors
- Frahm, J., Merboldt, K., & Hänicke, W.
- Venue
- Magnetic Resonance in Medicine
- Publisher
- Wiley
- Published
- 1988-04
- Volume
- 6
- Issue
- 4
- Pages
- 474-480
- ISSN
- 0740-3194 (ISSN-L)
- 1522-2594
- OpenAlex
- W2077187614
- Cited by
- 228
- References
- 0
- FWCI
- 2.72
- Type
- journal article
- Language
- en
- Open access
- closed
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- Frahm, J., Merboldt, K., & Hänicke, W. (1988). Direct FLASH MR imaging of magnetic field inhomogeneities by gradient compensation. Magnetic Resonance in Medicine. https://doi.org/10.1002/mrm.1910060412
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
