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Proceedings Paper

Laser stimulation for pain research
Author(s): Stuart Clark; Mark Russell Dickinson; Terence A. King; Anthony Jones; Andrew Chen; Stuart Derbyshire; D. W. Townsend; Paul E. Kinahan; M. A. Mintun; T. Nichols
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Paper Abstract

Pain is a serious medical problem; it inflicts huge economic loss and personal suffering. Pain signals are conducted via small, non- and partially myelinated A-delta and C nerve fibers and lasers are particularly well suited to stimulating these fibers. Large myelinated fibers convey touch and vibration information and these fibers are also discharged when contact thermodes and other touch pain stimuli are used and this would give a more muddled signal for functional imaging experiments. The advantages of lasers over conventional methods of pain stimulation are good temporal resolution, no variable parameters are involved such as contact area and they give very reproducible results. Accurate inter-stimulus changes can be achieved by computer control of the laser pulse duration, pulse height and repetition rate and this flexibility enables complex stimulation paradigms to be realized. We present a flexible carbon dioxide laser system designed to generate these stimuli for the study of human cerebral pain responses. We discuss the advantages within research of this system over other methods of pain stimulation such as thermal, electrical and magnetic. The stimulator is used in conjunction with functional magnetic resonance imaging, positron emission tomography and electrophysiological methods of imaging the brain's activity. This combination is a powerful tool for the study of pain-induced activity in different areas of the brain. An accurate understanding of the brain's response to pain will help in research into the areas of rheumatoid arthritis and chronic back pain.

Paper Details

Date Published: 8 January 1996
PDF: 9 pages
Proc. SPIE 2629, Biomedical Optoelectronics in Clinical Chemistry and Biotechnology, (8 January 1996); doi: 10.1117/12.229532
Show Author Affiliations
Stuart Clark, Univ. of Manchester (United Kingdom)
Mark Russell Dickinson, Univ. of Manchester (United Kingdom)
Terence A. King, Univ. of Manchester (United Kingdom)
Anthony Jones, Hope Hospital (United Kingdom)
Andrew Chen, Hope Hospital (United Kingdom)
Stuart Derbyshire, Hope Hospital (United Kingdom)
D. W. Townsend, Univ. of Pittsburgh Medical Ctr. (United States)
Paul E. Kinahan, Univ. of Pittsburgh Medical Ctr. (United States)
M. A. Mintun, Univ. of Pittsburgh Medical Ctr. (United States)
T. Nichols, Univ. of Pittsburgh Medical Ctr. (United States)

Published in SPIE Proceedings Vol. 2629:
Biomedical Optoelectronics in Clinical Chemistry and Biotechnology
Stefan Andersson-Engels; Mario Corti; Ivan Kertesz; Norbert Kroo; Heinz P. Weber; Terence A. King; Riccardo Pratesi; Stefan Seeger, Editor(s)

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