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View Full Version : Collecting EMG signals from a human subject within an MRI



Daniel Magnusson
11-04-1998, 09:20 AM
Hello Biomech-l people,

I am interested in the possibility of doing some EMG measurements using
surface and/or indwelling (a.k.a. needle, fine-wire) electrodes while human
subjects are in a Magnetic Resonance Imaging (MRI) scanner. I am aware that
wires (even non-ferric ones) placed in a magnetic field may cause a current
to be generated. The resultant heat and current in the wire(s) may be
harmful/painful to the subjects, and is experimentally (and ethically)
undesirable. I will have access to a 0.2 T MRI machine, and (potentially),
some machines with a higher field strength.

After a comprehensive literature search, I have not been able to find any
articles which have attempted to do this type of experiment (in any muscle
group).

My first question to the Biomech-L community: Does anyone know of any
individual or group, anywhere, that has made any attempts to do this type of
research? What type of success did they have with it? what kind of setup did
they use? How can I contact them?

My second question to the Biomech-L community: Assuming that no one has been
able to do this successfully, does anyone have any suggestions as to how
this could potentially be setup?

I have thought of utilizing magnetically shielded components (like wires and
pre-amplifiers) but I am not sure if such devices actually exist. All
searches (via web search engines) have failed to turn up any responses to
"magnetically shielded wires/cables/components". I have also contacted some
manufacturers directly to see if there is anyone who may be able to supply
such equipment. If anyone has used these type of components before, or knows
of any manufacturers/distributors who can supply these devices, I would
appreciate getting all relevant contact information.

Thanks for your help. As usual a summary of replies will be posted.

Regards,

Dan Magnusson B.Sc.
Master's student in Biomechanics
Human Performance Laboratory
Faculty of Kinesiology
University of Calgary
Calgary, Alberta, CANADA
T2N 1N4
Tel: 1 403 220-3432
Fax: 1 403 284-3553
email: dan@kin.ucalgary.ca

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