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Updated: Nov 26, 2025
Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping
Published on: December 8, 2023
A low-cost telescope for enhanced stimulus visual field coverage in functional MRI
Jasleen K Jolly1, Aislin A Sheldon2, Ivan Alvarez2
1Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom; Oxford Eye Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford, United Kingdom; Oxford Centre for Functional MRI of the Brain (FMRIB), Wellcome Centre for Integrative Neuroimaging, University of Oxford, Oxford, OX3 9DU, UK.
This study introduces a low-cost Galilean telescope to expand the visual field during functional magnetic resonance imaging (fMRI). The device increased visual cortex activation in most participants, aiding peripheral vision research.
Area of Science:
- Neuroimaging
- Visual Neuroscience
- Medical Devices
Background:
- Functional magnetic resonance imaging (fMRI) projection systems often have a limited visual field.
- A wide visual field is crucial for studying peripheral vision, especially in visual disorders.
Purpose of the Study:
- To present a low-cost Galilean telescopic device to double the effective visual field in MRI scanners.
- To assess the impact of the telescope on visual cortex activation during fMRI.
Main Methods:
- A non-ferromagnetic Galilean telescope compatible with MRI was developed.
- Visual cortex activation was measured by comparing responses to flickering checkerboards with and without the telescope.
Main Results:
- Three of four observers showed increased cortical activation with the telescope.
- One observer showed no difference due to lack of image fusion.
Conclusions:
- The telescope is a cost-effective solution for expanding the visual field in fMRI.
- It is easily implemented without major equipment changes.
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