Optical fibre-based goniometer for sensing patient position and movement within a magnetic resonance scanner using chromatic modulation
- 1 January 1993
- journal article
- Published by Taylor & Francis Ltd in Journal of Medical Engineering & Technology
- Vol. 17 (1), 1-8
- https://doi.org/10.3109/03091909309009977
Abstract
An optical fibre-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 fibre-optic link. The sensor exploits the advantages of optical fibre-based sensing, which include immunity to electromagnetic interference, intrinsic safety and chemical immunity. The detection electronics and signal processing are based on the 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 photodetectors with differing spectral responses. The optical fibre goniometer has an angular range of 90 degrees, with an average resolution of 2'. The long-term accuracy is within +/- 1 degree, the specified accuracy for the physiological application.Keywords
This publication has 8 references indexed in Scilit:
- Displacement measurement using a focusing chromatic modulatorMeasurement Science and Technology, 1990
- "Multiparameter Process Monitoring For Hazardous Areas With Optical Fibres And Sensors"Published by SPIE-Intl Soc Optical Eng ,1987
- Monitoring of the neonate undergoing MR imaging: technical considerations. Work in progress.Radiology, 1986
- Optical fibre sensors and systems for industryJournal of Physics E: Scientific Instruments, 1985
- Patient Monitoring during Magnetic Resonance ImagingAnesthesiology, 1985
- Optical systems and sensors for measurement and controlJournal of Physics E: Scientific Instruments, 1983
- Optical fiber sensor technologyIEEE Journal of Quantum Electronics, 1982
- The C.I.E. colorimetric standards and their useTransactions of the Optical Society, 1931