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Gregory Neil Kawchuk
03-30-2002, 05:52 AM
Thanks to the suggestion of Nicole Baker, we have acquired an aluminum "S-
type" gauge
that is compatible for our MR environment (Interface, 7401 E Butherus Drive *
Scottsdale, Arizona 85260
Fax: 480-948-1924 Tel: 800-947-5598 Scotsdale, Arizona).



Two other responses were obtained and are posted below.
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__________________________________________________ __________
Greg Kawchuk BSc, DC, MSc, PhD.
Assistant Professor, Faculty of Kinesiology, University of Calgary
Senior Chiropractor, University Health Services
www.ucalgary.ca/~kawchuk

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We had the same problem several years ago and we have designed our own load
cell in platic material. It's depending on the force level, accuracy and
repeatability that you require

Robert Darmana
INSERM
Laboratoire de Biomécanique
Hôpital Purpan
BP 3103
31026 TOULOUSE CEDEX 03
FRANCE
Tél. 33 (0)561493205
Fax. 33 (0)561496745
E-mail : Robert.Darmana@toulouse.inserm.fr


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Hi Greg,

We have succesfully used a strain-gauge based force measuring device here in
Oxford in a 3T scanner. We built the device ourselves, mounting off-the-shelf
strain
gauges on a small brass beam. We used a full (4 element) bridge, and
included a
small preamp locally in the unit. We had no real trouble with scanner noise.

We only use head gradients here, so the brass wasn't a problem. I guess if
you're using a full body set you'd need to replace that with plastic. I'm not
sure what most
commercial load cells use as their body.

Hope this helps,

Arthur

-----------------------------------------------------------
Arthur Magill, Applications Engineer

Address: Oxford University Centre for Functional
Magnetic Resonance Imaging of the Brain,
John Radcliffe Hospital,
Headington, Oxford OX3 9DU, UK
Email: arthur@fmrib.ox.ac.uk
Phone: +44 (0) 1865 222735
Fax: +44 (0) 1865 222717
WWW: http://www.fmrib.ox.ac.uk/

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