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Towards functional spin-echo BOLD line-scanning in humans at 7T
Luisa Raimondo1,2,3, Jurjen Heij4,5,6, Tomas Knapen4,5,6
1Spinoza Centre for Neuroimaging, Meibergdreef 75, 1105 BK, Amsterdam, The Netherlands. l.raimondo@spinozacentre.nl.
Magma (New York, N.Y.)
|January 10, 2023
Summary
We developed a spin-echo line-scanning (SELINE) sequence for high-resolution functional MRI (fMRI). While SELINE offers improved spatial resolution, its functional sensitivity requires enhancement for neuroscientific applications.
Area of Science:
- Neuroimaging
- Magnetic Resonance Imaging (MRI)
Background:
- Neurons form sub-millimeter structures, and neural activity occurs at millisecond timescales.
- High spatial and temporal resolution are crucial for functional MRI (fMRI).
Purpose of the Study:
- To implement and evaluate a spin-echo line-scanning (SELINE) sequence for high spatial and temporal resolution fMRI.
- To assess SELINE's performance compared to a gradient-echo line-scanning (GELINE) technique.
Main Methods:
- A SELINE sequence was developed by rotating the spin-echo refocusing gradient and removing the phase-encoding gradient.
- This method aims for high spatial (250 μm) and temporal (500 ms) resolution with microvascular specificity.
- SELINE data was compared against a gradient-echo (GELINE) counterpart.
Main Results:
- SELINE demonstrated significantly improved line selection, resulting in sharper line profiles compared to GELINE.
- However, this improvement came at the expense of a notable decrease in functional sensitivity.
Conclusions:
- The SELINE technique shows promise for high-resolution fMRI due to its superior line selection.
- Further optimization is necessary to address the reduced functional sensitivity before SELINE can be utilized in neuroscientific research.
