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MRI-compatible pneumatic stimulator for sensorimotor mapping.

Valentina Lolli1, Antonin Rovai2, Nicola Trotta2

  • 1Laboratoire de Cartographie fonctionnelle du Cerveau, ULB Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium; Department of Neuroradiology, Service of Radiology, CUB Hôpital Erasme, Université libre de Bruxelles (ULB), Brussels, Belgium.

Journal of Neuroscience Methods
|December 23, 2018
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Summary
This summary is machine-generated.

This study validates a new MRI-compatible pneumatic artificial muscle stimulator for motor functional magnetic resonance imaging (fMRI). This device enables reliable and reproducible passive motor tasks, improving sensorimotor cortex mapping in healthy subjects.

Keywords:
Blood-oxygen-level-dependent (BOLD) signalFunctional magnetic resonance imaging (fMRI)Passive movementPneumatic artificial muscle (PAM)Robotic deviceSensorimotor system

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Task-based motor functional magnetic resonance imaging (fMRI) faces challenges with participant performance variability.
  • Intra- and inter-subject variability in motor action execution impacts fMRI reliability.

Purpose of the Study:

  • To validate an MRI-compatible pneumatic artificial muscle (PAM) stimulator for fMRI mapping of the primary sensorimotor (SM1) cortex.
  • To assess the efficacy of PAM-induced passive movements for sensorimotor cortex activation.

Main Methods:

  • Utilized a novel MRI-compatible PAM stimulator for computer-controlled passive finger movements in 15 healthy subjects.
  • Employed block-design fMRI to map the primary sensorimotor cortex during active and passive index finger movements.
  • Compared brain activity (BOLD signal) between active and passive movements.

Main Results:

  • Passive finger movements reliably elicited significant blood-oxygen-level-dependent (BOLD) signal increases in the contralateral SM1 cortex.
  • Similar sensorimotor networks were activated by both active and passive movements.
  • Active movements showed significantly higher BOLD signal increases in SM1 cortex and associated areas compared to passive movements.

Conclusions:

  • PAM-based stimulators offer a reliable method for passive sensorimotor fMRI mapping in healthy individuals.
  • This approach allows accurate mapping of bilateral SM1 cortices within a short (6-min) fMRI protocol.
  • The PAM stimulator is smaller, handier, and easier to use in MRI settings than previous robotic devices.