A Smartphone-Based Low-Cost Inverted Laser Fluorescence Microscope for Disease Diagnosis

Area of Science:

• Biomedical Engineering
• Optical Microscopy
• Disease Diagnostics

Background:

• Conventional fluorescence microscopy is vital for disease diagnosis but is prohibitively expensive for low-income settings due to costly optical components.
• Smartphone-based microscopy offers a low-cost alternative but faces optical system challenges.

Purpose of the Study:

• To develop and validate a low-cost, inverted laser fluorescence microscope utilizing a smartphone for biological sample visualization.
• To create a simplified, laser-based optical filter system mimicking fluorescence filter cube capabilities.

Main Methods:

• Developed a smartphone-integrated inverted laser fluorescence microscope with a simplified analog optical filtering system.
• Validated optical filtering using microbeads labeled with common diagnostic fluorophores.
• Assessed disease diagnostic capabilities by comparing results with a commercial fluorescence microscope.

Main Results:

• Successfully visualized microbeads labeled with three different fluorophores.
• Detected Trypanosoma cruzi parasites (Chagas disease) and Antineutrophil cytoplasmic antibodies (ANCA-associated autoimmune disease).
• Achieved 400× magnification and demonstrated cost savings of at least one order of magnitude compared to commercial systems.

Conclusions:

• The developed smartphone fluorescence microscope is a cost-effective tool for disease diagnosis, particularly in resource-limited environments.
• The simplified laser-based optical filtering system effectively replaces conventional, expensive components.
• This technology holds significant potential for improving access to diagnostic tools globally.