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Proceedings Paper

Construction of an array of LEDs coupled to a concentrator for phototherapy
Author(s): Joana Almeida; Dawei Liang
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Paper Abstract

The use of LED devices for phototherapy has been expanding in the last decade. This technology provides a safer emission spectrum in large target tissue areas when compared to laser emissions. For enhancing the phototherapeutic effects of red light emitted by LEDs, a simple optical concentrator capable of efficient light concentration and homogenization was developed. The LEDs wavelength of 660 nm is coincident with an absorption peak of the mitochondrial photoreceptor molecule cytochrome c oxidase. The prototype was optimized by non-sequential ray-tracing software ZEMAX, attaining both excellent light uniformity and 50mW/cm2 irradiance at the concentrator output end. Heat emanated from the LEDs source is effectively dissipated by the side walls of the concentrator, ensuring a nearly constant temperature environment for tissue treatment. The prototype was tested on cutaneous hyperpigmented marks caused by cupping in two healthy volunteers. Marks were irradiated by LEDs radiations with or without the use of concentrator respectively. Equal exposure durations and light fluences were tested. The use of the concentrator-coupled LEDs source revealed an activation of blood movement immediately after LEDs exposure, an effect not attainable by the LEDs source without the concentrator even at extended exposure time. Promising futures for the treatment of inflammation, tissue repair and skin rejuvenation could be expected by adopting this simple technique.

Paper Details

Date Published: 2 June 2011
PDF: 7 pages
Proc. SPIE 8092, Medical Laser Applications and Laser-Tissue Interactions V, 80920K (2 June 2011); doi: 10.1117/12.885923
Show Author Affiliations
Joana Almeida, Univ. Nova de Lisboa (Portugal)
Dawei Liang, Univ. Nova de Lisboa (Portugal)

Published in SPIE Proceedings Vol. 8092:
Medical Laser Applications and Laser-Tissue Interactions V
Ronald Sroka; Lothar D. Lilge, Editor(s)

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