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Datum
2021-01Typ
- Journal Article
ETH Bibliographie
yes
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Abstract
Purpose
The aim of this work is the reconciliation of high spatial and temporal resolution for MRI. For this purpose, a novel sampling strategy for 3D encoding is proposed, which provides flexible k-space segmentation along with uniform sampling density and benign filtering effects related to signal decay.
Methods
For time-critical MRI applications such as functional MRI (fMRI), 3D k-space is usually sampled by stacking together 2D trajectories such as echo planar imaging (EPI) or spiral readouts, where each shot covers one k-space plane. For very high temporal and medium to low spatial resolution, tilted hexagonal sampling (T-Hex) was recently proposed, which allows the acquisition of a larger k-space volume per excitation than can be covered with a planar readout. Here, T-Hex is described in a modified version where it instead acquires a smaller k-space volume per shot for use with medium temporal and high spatial resolution.
Results
Mono-planar T-Hex sampling provides flexibility in the choice of speed, signal-to-noise ratio (SNR), and contrast for rapid MRI acquisitions. For use with a conventional gradient system, it offers the greatest benefit in a regime of high in-plane resolution <1 mm. The sampling scheme is combined with spirals for high sampling speed as well as with more conventional EPI trajectories.
Conclusion
Mono-planar T-Hex sampling combines fast 3D encoding with SNR efficiency and favorable depiction characteristics regarding noise amplification and filtering effects from urn:x-wiley:07403194:media:mrm28979:mrm28979-math-0003 decay, thereby providing flexibility in the choice of imaging parameters. It is attractive both for high-resolution time series such as fMRI and for applications that require rapid anatomical imaging. Mehr anzeigen
Persistenter Link
https://doi.org/10.3929/ethz-b-000502401Publikationsstatus
publishedExterne Links
Zeitschrift / Serie
Magnetic Resonance in MedicineBand
Seiten / Artikelnummer
Verlag
WileyThema
3D encoding; algebraic image reconstruction; magnetic field monitoring; spiral imagingOrganisationseinheit
03955 - Stephan, Klaas E. / Stephan, Klaas E.
03628 - Prüssmann, Klaas P. / Prüssmann, Klaas P.
ETH Bibliographie
yes
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