Zobrazeno 1 - 10
of 29
pro vyhledávání: '"S. Johanna Vannesjo"'
Autor:
Merve Kaptan, Ulrike Horn, S. Johanna Vannesjo, Toralf Mildner, Nikolaus Weiskopf, Jürgen Finsterbusch, Jonathan C.W. Brooks, Falk Eippert
Publikováno v:
NeuroImage, Vol 275, Iss , Pp 120152- (2023)
The investigation of spontaneous fluctuations of the blood-oxygen-level-dependent (BOLD) signal has recently been extended from the brain to the spinal cord, where it has stimulated interest from a clinical perspective. A number of resting-state func
Externí odkaz:
https://doaj.org/article/b6a663d801864e7697da5d6326089d0e
Autor:
Nadine N. Graedel, Lars Kasper, Maria Engel, Jennifer Nussbaum, Bertram J. Wilm, Klaas P. Pruessmann, S. Johanna Vannesjo
Publikováno v:
NeuroImage, Vol 245, Iss , Pp 118674- (2021)
Spiral imaging is very well suited for functional MRI, however its use has been limited by the fact that artifacts caused by gradient imperfections and B0 inhomogeneity are more difficult to correct compared to EPI. Effective correction requires accu
Externí odkaz:
https://doaj.org/article/a3ab65573f0d42e3b5a18dae775f83a9
Autor:
Alan C. Seifert, Junqian Xu, Yazhuo Kong, Falk Eippert, Karla L. Miller, Irene Tracey, S. Johanna Vannesjo
Publikováno v:
bioRxiv
PurposeAlthough functional MRI is widely applied in the brain, fMRI of the spinal cord is more technically demanding. Proximity to the vertebral column and lungs results in strong spatial inhomogeneity and temporal fluctuations in B0. Increasing fiel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a54e0a62df24d882403c26f9946d721
https://europepmc.org/articles/PMC9915652/
https://europepmc.org/articles/PMC9915652/
Autor:
Zoltan Nagy, Chloe Hutton, Gergely David, Natalie Hinterholzer, Ralf Deichmann, Nikolaus Weiskopf, S Johanna Vannesjo
Publikováno v:
Cerebral Cortex
There is emerging evidence that sampling the blood-oxygen-level-dependent (BOLD) response with high temporal resolution opens up new avenues to study the in vivo functioning of the human brain with functional magnetic resonance imaging. Because the s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cfdb93128f42e3d44e3b8506e3f31573
https://pubmed.ncbi.nlm.nih.gov/36169574
https://pubmed.ncbi.nlm.nih.gov/36169574
Publikováno v:
IEEE Transactions on Medical Imaging. 39:806-815
MRI gradient systems are required to generate magnetic field gradient waveforms with very high fidelity. This is commonly implemented by gradient system calibration and pre-emphasis. However, a number of mechanisms, particularly thermal changes, caus
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ac03b8ddc223ad2c817a1d081eef705
https://doi.org/10.1109/tmi.2019.2936107
https://doi.org/10.1109/tmi.2019.2936107
Autor:
S. Johanna Vannesjo
Publikováno v:
Advances in Magnetic Resonance Technology and Applications ISBN: 9780128244609
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d51eb2eab332a835b52e6a8f912cb3c
https://doi.org/10.1016/b978-0-12-824460-9.00018-2
https://doi.org/10.1016/b978-0-12-824460-9.00018-2
Autor:
Maria Engel, Klaas P. Pruessmann, Jennifer Nussbaum, Bertram J. Wilm, S. Johanna Vannesjo, Lars Kasper, Nadine N. Graedel
Publikováno v:
NeuroImage, 245
NeuroImage, Vol 245, Iss, Pp 118674-(2021)
NeuroImage, Vol 245, Iss, Pp 118674-(2021)
Spiral imaging is very well suited for functional MRI, however its use has been limited by the fact that artifacts caused by gradient imperfections and B0 inhomogeneity are more difficult to correct compared to EPI. Effective correction requires accu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21f8c8af316ecf78a069352fdc49486c
https://hdl.handle.net/20.500.11850/517265
https://hdl.handle.net/20.500.11850/517265
Autor:
Merve Kaptan, Ronald Hartley-Davies, Valeria Oliva, Falk Eippert, Jürgen Finsterbusch, S. Johanna Vannesjo, Nikolaus Weiskopf, Toralf Mildner, Ulrike Horn, Jonathan C.W. Brooks
Functional magnetic resonance imaging (fMRI) of the human spinal cord faces many challenges, one of which is signal loss due to local magnetic field inhomogeneities. This issue can be addressed with slice-specific z-shimming, which compensates for th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::26217b7cf911c692263c4c2c0ccd96db
https://doi.org/10.1101/2021.07.27.454049
https://doi.org/10.1101/2021.07.27.454049
Autor:
Yolanda Duerst, Matteo Pavan, S. Johanna Vannesjo, Klaas P. Pruessmann, Simon Gross, Laetitia Vionnet, Benjamin E. Dietrich, Christoph Barmet
Publikováno v:
Magnetic Resonance in Medicine. 78:1607-1622
Purpose The goal of this contribution is to enhance the fidelity and switching speed of gradient and shim fields by advancing pre-emphasis toward broadband and full cross-term correction. Theory and Methods The proposed approach is based on viewing g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3fd3ec758e47491c4ccb4eaa23918d68
https://doi.org/10.1002/mrm.26531
https://doi.org/10.1002/mrm.26531
Autor:
David O. Brunner, Lars Kasper, Max Haeberlin, Bertram J. Wilm, Klaas P. Pruessmann, Thomas Schmid, Benjamin E. Dietrich, Christoph Barmet, S. Johanna Vannesjo, Simon Gross, Zoltan Nagy
Publikováno v:
Magnetic Resonance in Medicine. 74:925-933
Purpose Diffusion MRI is compromised by unknown field perturbation during image encoding. The purpose of this study was to address this problem using the recently described approach of concurrent magnetic field monitoring. Methods Magnetic field dyna
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b8c7a4a671a0e79aad0705a005828154
https://doi.org/10.1002/mrm.25827
https://doi.org/10.1002/mrm.25827