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Multi-Contrast Imaging and Digital Refocusing on a Mobile Microscope with a Domed LED Array.

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Summary
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This study introduces an enhanced CellScope microscope add-on, enabling multi-contrast and 3D imaging on a smartphone. The device offers advanced diagnostic and research capabilities for point-of-care applications.

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Area of Science:

  • Biomedical Engineering
  • Optical Microscopy
  • Computational Imaging

Background:

  • CellScope is a low-cost, smartphone-based microscope for point-of-care diagnostics.
  • Existing CellScope limitations include single illumination mode and reliance on mechanical focusing.

Purpose of the Study:

  • To develop and validate an add-on device for the CellScope to enhance its imaging capabilities.
  • To enable simultaneous multi-contrast imaging and digital refocusing for improved diagnostic and research applications.

Main Methods:

  • Replaced the original LED with a programmable domed LED array for computational illumination.
  • Implemented scanning illumination angles to capture lightfield datasets.
  • Developed smartphone-based acquisition and processing for 3D intensity and phase imaging.

Main Results:

  • Achieved simultaneous brightfield, darkfield, and phase imaging modes.
  • Demonstrated digital refocusing for 3D imaging and software-only focus correction.
  • Validated performance comparable to commercial microscopes across various magnifications.

Conclusions:

  • The developed add-on device significantly expands CellScope's field imaging capabilities.
  • This portable computational microscope platform offers new possibilities for clinical diagnostics and scientific research.
  • The device integrates advanced imaging techniques into a user-friendly, mobile format.