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Proceedings Paper

Development and evaluation of a light-emitting diode endoscopic light source
Author(s): Neil T. Clancy; Rui Li; Kevin Rogers; Paul Driscoll; Peter Excel; Ron Yandle; George Hanna; Nigel Copner; Daniel S. Elson
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Paper Abstract

Light-emitting diode (LED) based endoscopic illumination devices have been shown to have several benefits over arclamp systems. LEDs are energy-efficient, small, durable, and inexpensive, however their use in endoscopy has been limited by the difficulty in efficiently coupling enough light into the endoscopic light cable. We have demonstrated a highly homogenised lightpipe LED light source that combines the light from four Luminus LEDs emitting in the red, green, blue and violet using innovative dichroics that maximise light throughput. The light source spectrally combines light from highly divergent incoherent sources that have a Lambertian intensity profile to provide illumination matched to the acceptance numerical aperture of a liquid light guide or fibre bundle. The LED light source was coupled to a standard laparoscope and performance parameters (power, luminance, colour temperature) compared to a xenon lamp. Although the total illuminance from the endoscope was lower, adjustment of the LEDs' relative intensities enabled contrast enhancement in biological tissue imaging. The LED light engine was also evaluated in a minimally invasive surgery (MIS) box trainer and in vivo during a porcine MIS procedure where it was used to generate 'narrowband' images. Future work using the violet LED could enable photodynamic diagnosis of bladder cancer.

Paper Details

Date Published: 28 February 2012
PDF: 7 pages
Proc. SPIE 8214, Advanced Biomedical and Clinical Diagnostic Systems X, 82140R (28 February 2012);
Show Author Affiliations
Neil T. Clancy, Imperial College London (United Kingdom)
Rui Li, Imperial College London (United Kingdom)
Kevin Rogers, Univ. of Glamorgan (United Kingdom)
Cymtec Ltd. (United Kingdom)
Paul Driscoll, Cymtec Ltd. (United Kingdom)
Peter Excel, Glyndwr Univ. (United Kingdom)
Ron Yandle, Cymtec Ltd. (United Kingdom)
George Hanna, Imperial College London (United Kingdom)
Nigel Copner, Univ. of Glamorgan (United Kingdom)
Cymtec Ltd. (United Kingdom)
Daniel S. Elson, Imperial College London (United Kingdom)

Published in SPIE Proceedings Vol. 8214:
Advanced Biomedical and Clinical Diagnostic Systems X
Tuan Vo-Dinh; Anita Mahadevan-Jansen; Warren S. Grundfest M.D., Editor(s)

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