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Light source design for spectral tuning in biomedical imaging.

Chandrajit Basu¹, Sebastian Schlangen¹, Merve Meinhardt-Wollweber¹

¹Leibniz University Hannover , Hannover Centre for Optical Technologies, Nienburger Strasse 17, Hannover 30167, Germany.

Journal of Medical Imaging (Bellingham, Wash.)

|February 4, 2016

Summary

A novel light-emitting diode (LED) dermoscope uses a remote phosphor light source for adjustable light output, improving skin cancer screening. This adaptable system enhances tissue contrast for better diagnostic accuracy.

Keywords:

biomedical imaging contrast enhancement digital dermoscopy remote-phosphor system skin-cancer screening

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Area of Science:

Biomedical Optics
Medical Imaging Technology
Dermatology

Background:

Current noncontact dermoscopes often use light-emitting diodes (LEDs) with fixed spectral output.
Fixed spectral output limits adaptability to varying tissue optical properties.
This can result in suboptimal contrast and diagnostic information.

Purpose of the Study:

To develop and evaluate a novel noncontact dermoscope prototype for skin cancer screening.
To introduce a remote phosphor-based modular light source with adjustable spectrum and color temperature.
To enhance imaging contrast and diagnostic capabilities for diverse tissue types.

Main Methods:

Proposed a noncontact dermoscope architecture incorporating a remote phosphor-based modular light source.
Demonstrated the ability to easily and significantly alter the spectrum and color temperature of the output light.
Investigated the system's adaptability to spectral absorption characteristics of different human tissues.

Main Results:

The new system offers adjustable light spectrum and color temperature, unlike fixed-output LEDs.
This adaptability allows for optimization based on wavelength-dependent tissue absorption and reflectivity.
Achieved improved contrast for various imaged tissue components, enhancing diagnostic potential.

Conclusions:

The developed remote phosphor LED lighting architecture offers significant advantages for noncontact dermoscopy.
The system's adjustable spectral output improves tissue contrast, aiding in skin cancer screening.
This adaptable lighting concept has broad applicability in other medical imaging modalities, such as endoscopy.