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Imaging Biological Samples with Optical Microscopy01:18

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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Smartphone Fundus Photography
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FPscope: a field-portable high-resolution microscope using a cellphone lens.

Siyuan Dong1, Kaikai Guo1, Pariksheet Nanda2

  • 1Biomedical Engineering, University of Connecticut, Storrs, CT, 06269, USA ; These authors contributed equally to this work.

Biomedical Optics Express
|November 1, 2014
PubMed
Summary

A novel 3D-printed microscope, FPscope, repurposes cellphone lenses for high-resolution imaging. This low-cost Fourier ptychographic microscope achieves diffraction-limited resolution and extended depth-of-focus, enabling accessible diagnostics.

Keywords:
(110.0180) Microscopy(170.3010) Image reconstruction techniques(170.3880) Medical and biological imaging

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Area of Science:

  • Optics and Photonics
  • Biomedical Engineering
  • Microscopy

Background:

  • Conventional microscopes face limitations in resolution and depth-of-focus.
  • Cell phone lens modules offer a low-cost, high-quality alternative for optical systems.
  • Fourier ptychography enables super-resolution imaging by combining multiple low-resolution images.

Purpose of the Study:

  • To develop a 3D-printed, high-resolution Fourier ptychographic microscope (FPscope) using a repurposed cellphone lens.
  • To demonstrate the capability of FPscope for imaging resolution targets and biological specimens.
  • To highlight the potential of FPscope for low-resource healthcare and education.

Main Methods:

  • A 3D-printed microscope frame was designed to house a cellphone lens module in reverse.
  • An LED array illuminated samples from various incident angles.
  • Fourier ptychographic algorithms synthesized images to overcome diffraction limits.

Main Results:

  • FPscope achieved high-resolution imaging with a maximum synthetic numerical aperture (NA) of 0.5.
  • The microscope demonstrated a depth-of-focus of approximately 0.1 mm, significantly longer than conventional objectives.
  • Successful imaging of resolution targets and biological specimens was performed.

Conclusions:

  • The FPscope platform offers a cost-effective solution for high-resolution microscopy.
  • The extended depth-of-focus makes it suitable for imaging thicker samples.
  • This technology has the potential to improve healthcare access in underserved regions and serve as an educational tool.