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Optical Fibre Based Goniometer for Sensing Patient Position and Movement within a Magnetic Resonance Scanner using Chromatic Modulation
Scully P.J., Holmes R. and Jones G.R
Journal of Medical Engineering & Technology. 1993;17, (1):1-8.
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Abstract
An optical jibre-based goniometer is described. This instrument was designed to measure the angular position of patients' limbs within the core of a magnetic resonance body scanner, via a 40 m remote jibre-optic link. The sensor exploits the advantagesof optical jibre-based sensing, which include immunity to electromagnetic interference, intrinsic safety and chemical immunip . The detection electronics and signal processing are based onthe principles of chromatic modulation, an inexpensive, intensity independent technique in which a change in the spectral power distribution is measured over a broad bandwidth, by photodetectorswith differing spectral responses. The optical jibre goniometer has an angular range of go", with an average resolution of 2'.The long-term accuracy is within +I", the specifid accuracy for the physiological application.
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