ArticleMagnetic resonance in medicine2022
Accuracy investigations for volumetric head-motion navigators with and without EPI at 7 T.
Article in Magnetic resonance in medicine, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Intra-MRI Head Motion Tracking and Correction: A Quantitative In Vivo Evaluation Framework.NMR in biomedicine · 2026Article
- Mesoscale imaging of the human cerebellum reveals converging regional specialization of its morphology, vasculature, and cytoarchitecture.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Motion and magnetic field inhomogeneity correction techniques for chemical exchange saturation transfer (CEST) MRI: A contemporary review.NMR in biomedicine · 2025Review
- Accuracy investigations for volumetric head-motion navigators with and without EPI at 7 T.Magnetic resonance in medicine · 2022Article
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Authors and funding
3 authors.
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Abstract
purposeAccuracy investigation of volumetric navigators for motion correction, with emphasis on geometric EPI distortions at ultrahigh field.
methodsHigh-resolution Dixon images were collected in different head positions and reconstructed to water, fat, T
resultsIncreased accuracy was observed with increased spatial resolution for non-EPI navigators. When using EPI, the distortions had a negative effect on registration accuracy, which was most noticeable for high-resolution navigators. Parallel imaging helped to alleviate those caveats to a certain extent, and 5-fold acceleration gave close to similar accuracy to non-EPI in most cases. Shortening the TE by partial Fourier sampling was shown to be mostly beneficial, except for water navigators with long readout durations. The EPI blip direction had an influence on navigator accuracy, and positive blip gradient polarities (yielding mostly image stretching frontally) typically gave the best accuracy for water navigators, whereas no clear recommendation could be made for fat navigators. Generally, fat EPI navigators had lower accuracy than water EPI navigators with otherwise similar parameters.
conclusionsEcho planar imaging has been widely used for MRI navigators, but the induced distortions reduce navigator accuracy at ultrahigh field. This study can help protocol optimization and guide the complex tradeoff between resolution and EPI acceleration in navigator parameter setup.
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