Author(s)
Kendrick Kay
Published 5 Projects
Neuroscience Representational Similarity Vasculature Veins Bold Fmri
Keith W Jamison
Published 3 Projects
Neuroscience Fmri Visual Cortex Hemodynamic Timecourse High Resolution Fmri
Ruyuan Zhang
Published 4 Projects
Neuroscience Hemodynamic Timecourse High Resolution Fmri Vasculature Veins
Eshed Margalit
Published 1 Project
Neuroscience Vasculature Veins Cortical Depth Ultra High Field Mri
Kamil UÄźurbil
Published 3 Projects
Neuroscience Fmri Visual Cortex Hemodynamic Timecourse High Resolution Fmri
Content
Video Abstract (AI generated) (01:56) Paper PreprintAdvances in hardware, pulse sequences, and reconstruction techniques have made it possible to perform functional magnetic resonance imaging (fMRI) at sub-millimeter resolution while maintaining high spatial coverage and acceptable signal-to-noise ratio. Here, we examine whether ultra-high-resolution fMRI can be exploited for routine use in neuroscience research. We conducted fMRI in human visual cortex during a simple event-related visual experiment (7T, gradient-echo EPI, 0.8-mm isotropic voxels, 2.2-s sampling rate, 84 slices), and developed analysis and visualization tools to assess the quality of the data. We make three main observations. First, we find that the acquired fMRI images, combined with appropriate surface-based processing, provide reliable and accurate measurements of fine-scale blood oxygenation level dependent (BOLD) activity patterns. Second, we show that the highly folded structure of cortex causes substantial biases on spatial resolution and data visualization. Third, we examine the well-recognized issue of venous contributions to fMRI signals. In a systematic assessment of large sections of cortex measured at a fine scale, we show that time-averaged T2*-weighted EPI intensity is a simple, robust marker of venous effects. These venous effects are unevenly distributed across cortex, are more pronounced in gyri and outer cortical depths, and are, to a certain degree, in consistent locations across subjects relative to cortical folding. Furthermore, we show that these venous effects are strongly correlated with BOLD responses evoked by the experiment. We conclude that ultra-high-resolution fMRI can provide robust information about fine-scale BOLD activity patterns, but special care must be exercised in visualizing and interpreting these patterns, especially with regards to the confounding influence of the brain's vasculature. To help translate these methodological findings to neuroscience research, we provide practical suggestions for both high-resolution and standard-resolution fMRI studies.
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Kendrick Kay. (2021, Nov 1).A critical assessment of data quality and venous effects in ultra-high-resolution fMRI[Video]. Scitok. https://scitok.com/project/p/841728e9
Kay Kendrick. "A critical assessment of data quality and venous effects in ultra-high-resolution fMRI" Scitok, uploaded by Kay Kendrick, 1 Nov, 2021, https://scitok.com/project/p841728e9
Kendrick Kay. "A critical assessment of data quality and venous effects in ultra-high-resolution fMRI" Scitok. (Nov 1, 2021). https://scitok.com/project/p/841728e9
Kendrick Kay (Nov 1, 2021). A critical assessment of data quality and venous effects in ultra-high-resolution fMRI Scitok. https://scitok.com/project/p/841728e9
Kendrick Kay. A critical assessment of data quality and venous effects in ultra-high-resolution fMRI[video]. 2021 Nov 1. https://scitok.com/project/p/841728e9
@online{al2006link, title={ A critical assessment of data quality and venous effects in ultra-high-resolution fMRI }, author={ Kay, Kendrick }, organization={Scitok}, month={ Nov }, day={ 1 }, year={ 2021 }, url = {https://scitok.com/project/p/841728e9}, }