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An empirical investigation of the benefit of increasing the temporal resolution of task-evoked fMRI data with multi-band imaging

Darányi, Virág; Hermann, Petra; Homolya, István; Vidnyánszky, Zoltán; Nagy, Zoltan (2021). An empirical investigation of the benefit of increasing the temporal resolution of task-evoked fMRI data with multi-band imaging. Magma, 34(5):667-676.

Abstract

Objective

There is a tendency for reducing TR in MRI experiments with multi-band imaging. We empirically investigate its benefit for the group-level statistical outcome in task-evoked fMRI.
Methods

Three visual fMRI data sets were collected from 17 healthy adult participants. Multi-band acquisition helped vary the TR (2000/1000/410 ms, respectively). Because these data sets capture different temporal aspects of the haemodynamic response (HRF), we tested several HRF models. We computed a composite descriptive statistic, H, from β’s of each first-level model fit and carried it to the group-level analysis. The number of activated voxels and the t value of the group-level analysis as well as a goodness-of-fit measure were used as surrogate markers of data quality for comparison.
Results

Increasing the temporal sampling rate did not provide a universal improvement in the group-level statistical outcome. Rather, both the voxel-wise and ROI-averaged group-level results varied widely with anatomical location, choice of HRF and the setting of the TR. Correspondingly, the goodness-of-fit of HRFs became worse with increasing the sampling frequency.
Conclusion

Rather than universally increasing the temporal sampling rate in cognitive fMRI experiments, these results advocate the performance of a pilot study for the specific ROIs of interest to identify the appropriate temporal sampling rate for the acquisition and the correspondingly suitable HRF for the analysis of the data.

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:03 Faculty of Economics > Department of Economics
Dewey Decimal Classification:330 Economics
Scopus Subject Areas:Life Sciences > Biophysics
Health Sciences > Radiological and Ultrasound Technology
Health Sciences > Radiology, Nuclear Medicine and Imaging
Uncontrolled Keywords:Radiology, Nuclear Medicine and imaging, Radiological and Ultrasound Technology, Biophysics
Scope:Discipline-based scholarship (basic research)
Language:English
Date:1 October 2021
Deposited On:11 Oct 2022 07:54
Last Modified:28 Oct 2024 02:36
Publisher:Springer
ISSN:0968-5243
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/s10334-021-00918-z
Other Identification Number:merlin-id:22821
Project Information:
  • Funder: Universität Zürich
  • Grant ID:
  • Project Title:
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  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)

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