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Magnetic Resonance Materials in Physics, Biology and Medicine

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01.04.2018 | Research Article

Improving fMRI in signal drop-out regions at 7 T by using tailored radio-frequency pulses: application to the ventral occipito-temporal cortex

verfasst von: Catarina Rua, Stephen J. Wastling, Mauro Costagli, Mark R. Symms, Laura Biagi, Mirco Cosottini, Alberto Del Guerra, Michela Tosetti, Gareth J. Barker

Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine | Ausgabe 2/2018

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Abstract

Objective

Signal drop-off occurs in echo-planar imaging in inferior brain areas due to field gradients from susceptibility differences between air and tissue. Tailored-RF pulses based on a hyperbolic secant (HS) have been shown to partially recover signal at 3 T, but have not been tested at higher fields.

Materials and methods

The aim of this study was to compare the performance of an optimized tailored-RF gradient-echo echo-planar imaging (TRF GRE-EPI) sequence with standard GRE-EPI at 7 T, in a passive viewing of faces or objects fMRI paradigm in healthy subjects.

Results

Increased temporal-SNR (tSNR) was observed in the middle and inferior temporal lobes and orbitofrontal cortex of all subjects scanned, but elsewhere tSNR decreased relative to the standard acquisition. In the TRF GRE-EPI, increased functional signal was observed in the fusiform, lateral occipital cortex, and occipital pole, regions known to be part of the visual pathway involved in face-object perception.

Conclusion

This work highlights the potential of TRF approaches at 7 T. Paired with a reversed-gradient distortion correction to compensate for in-plane susceptibility gradients, it provides an improved acquisition strategy for future neurocognitive studies at ultra-high field imaging in areas suffering from static magnetic field inhomogeneities.

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Titel: Improving fMRI in signal drop-out regions at 7 T by using tailored radio-frequency pulses: application to the ventral occipito-temporal cortex
verfasst von: Catarina Rua
Stephen J. Wastling
Mauro Costagli
Mark R. Symms
Laura Biagi
Mirco Cosottini
Alberto Del Guerra
Michela Tosetti
Gareth J. Barker
Publikationsdatum: 01.04.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine / Ausgabe 2/2018
Print ISSN: 0968-5243
Elektronische ISSN: 1352-8661
DOI: https://doi.org/10.1007/s10334-017-0652-x

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Improving fMRI in signal drop-out regions at 7 T by using tailored radio-frequency pulses: application to the ventral occipito-temporal cortex

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Objective

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Results

Conclusion

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Objective

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Conclusion

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