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| Typical Number in Hospital: 2 | Cost Bands: 5 | References: 3 |
A strip chart recorder of exceptionally high frequency response (up to 100 kHz) can be made by projecting the spot from a cathode ray tube on to a moving strip of photographic paper. An effective way of achieving this is with a special CRT in which the glass face plate is made up of short optic fibres so that the luminous spot on the inside of the glass transfers its light along the fibres to the outside where the glass is in contact with the photographic strip. In medical work such recorders are used for electromyography, where frequency response requirement is about 1 kHz.
They are also employed in echo-cardiography where the single line scan showing bright dots representing echoes received is presented to the fibre-optic CRT. The paper record will show not only the echoes received, but also their motion.
Content and Design Copyright 2000 Dr. Malcolm C Brown. See Title Page for more details