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Looping Kooshball: Improved k-space coverage for silent fMRI using 3D coherence trajectories — arXiv:2610.38072

Source: arXiv (en)
Original: https://arxiv.org/abs/2610.38072
License (as archived): CC0-1.0
Archived: 2026-11-01T03:01:13.955Z
SHA-256 of the archived text: e6ade89356bf18748a6a55d509160fd24e44921d2ce7ea1a4bf3e4cf238aabcc
Stable URL of this page: https://metraipolis.com/documento/dc_24931aaa320a

How to cite

Looping Kooshball: Improved k-space coverage for silent fMRI using 3D coherence trajectories — arXiv:2610.38072 — arXiv (en), https://arxiv.org/abs/2610.38072 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_24931aaa320a (Metraipolis archive dc_24931aaa320a, sha256 e6ade89356bf18748a6a55d509160fd24e44921d2ce7ea1a4bf3e4cf238aabcc)

BibTeX

@misc{dc24931aaa320a,
  title = {Looping Kooshball: Improved k-space coverage for silent fMRI using 3D coherence trajectories — arXiv:2610.38072},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2610.38072},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_24931aaa320a; sha256 e6ade89356bf18748a6a55d509160fd24e44921d2ce7ea1a4bf3e4cf238aabcc},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2610.38072. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Functional MRI (fMRI) is widely used to characterize brain activity and connectivity, but conventional gradient-echo echo-planar imaging produces high acoustic sound-pressure levels by operating gradient hardware near its limits. Scanner noise can increase anxiety and motion, particularly in noise-sensitive populations, and can evoke auditory responses that confound both task-based and resting-state measurements. Looping Star (LS) is a near-silent, T2*-weighted acquisition that uses slowly varying gradients and multiplexed, temporally staggered coherences. Conventional LS rotates planar encoding trajectories across shots to achieve three-dimensional coverage. Because these planes intersect near the center of k-space, sampling is dense at low spatial frequencies but sparse and nonuniform at the periphery, limiting efficiency when relatively few shots are combined for high temporal resolution. We introduce Looping Kooshball (LKB), a complementary LS trajectory that extends through all three spatial dimensions within each shot. LKB is designed to improve volumetric k-space coverage while preserving the echo-formation and coherence-crushing properties of LS. We compare LKB with conventional LS using point-spread-function analysis, in-bore acoustic measurements, structural phantom imaging, and preliminary visual-motor fMRI experiments. We evaluate whether LKB reduces undersampling artifacts and improves temporal stability and functional-activation detection without sacrificing the near-silent operation of LS.

Tema degli esploratori: statistica e scienza dei dati (elenco arXiv eess.IV, nuovi lavori del giorno).
Categorie arXiv: Image and Video Processing (eess.IV).
Pagina del lavoro: https://arxiv.org/abs/2610.38072 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-11-01T02:26:15.592Z dalla pagina https://arxiv.org/list/eess.IV/new (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).