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Proton-density-weighted spinal fMRI with sensorimotor stimulation at 0.2 T
Man Cheuk Ng1, Kelvin K Wong, Geng Li
1Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, 5/F, Professor Block, Queen Mary Hospital, Pokfulam, Hong Kong. mcng@eee.hku.hk
Neuroimage
|September 6, 2005
Summary
This study explored proton density changes in the cervical spinal cord during sensorimotor tasks using low-field fMRI. Findings suggest task-driven proton density alterations occur in the spinal cord.
Area of Science:
- Neuroimaging
- Spinal Cord Physiology
- Functional Magnetic Resonance Imaging (fMRI)
Background:
- Functional magnetic resonance imaging (fMRI) is a key tool for studying brain activity.
- Investigating spinal cord activation using fMRI presents unique challenges due to its anatomy and lower signal-to-noise ratio.
- Understanding spinal cord function during sensorimotor tasks is crucial for neurological research.
Purpose of the Study:
- To assess the feasibility of detecting proton density alterations in the cervical spinal cord during functional activation.
- To investigate task-driven changes in proton density using low-field fMRI.
- To explore the potential of proton density changes as a reliable indicator of spinal cord activity.
Main Methods:
- Proton-density-weighted fMRI was performed at a low magnetic field strength (0.2 T).
- Healthy volunteers underwent sensorimotor stimulation via simultaneous hand gripping.
- Short echo time (TE) of 24 ms was employed to minimize the Blood-Oxygen-Level-Dependent (BOLD) effect.
Main Results:
- Activation was localized at the C6-C7 spinal cord levels in over 70% of subjects.
- Discrete activation signals were observed in both anterior and posterior horns of the cervical spinal cord.
- An average fractional signal change of 4.06% was recorded, attributed mainly to proton density increase.
Conclusions:
- Low-field fMRI can detect task-driven proton density changes in the cervical spinal cord.
- The observed signal changes are primarily due to alterations in proton density, not the BOLD effect.
- This technique offers a promising avenue for studying spinal cord function and activation patterns.
