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A PDMS-Based 2-Axis Waterproof Scanner for Photoacoustic Microscopy.

Jin Young Kim1, Changho Lee2, Kyungjin Park3

  • 1Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea. ronsan@postech.ac.kr.

Sensors (Basel, Switzerland)
|April 30, 2015
PubMed
Summary

A new polydimethylsiloxane (PDMS)-based 2-axis scanner enables compact, waterproof optical-resolution photoacoustic microscopy (OR-PAM). This scanner achieves high signal-to-noise ratios for in vivo imaging in biomedical research.

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Area of Science:

  • Biomedical Imaging
  • Optical Microscopy
  • Photoacoustics

Background:

  • Optical-resolution photoacoustic microscopy (OR-PAM) offers in vivo optically sensitive imaging.
  • Existing systems face limitations in size, speed, scan range, and signal-to-noise ratios (SNRs), particularly in aqueous environments.

Purpose of the Study:

  • To develop a compact, flexible, and waterproof 2-axis scanner for OR-PAM.
  • To enhance imaging speed, scan range, and SNRs for in vivo applications.

Main Methods:

  • Fabrication of a polydimethylsiloxane (PDMS)-based 2-axis scanner with dimensions 15x15x15 mm.
  • Characterization of scanner performance under DC and AC conditions, including scanning angles and resonance frequencies in air and water.
  • Integration of the scanner into an OR-PAM system for imaging.

Main Results:

  • The scanner achieved maximum scanning angles of 18° (air) and 13° (water).
  • Resonance frequencies were measured at 60 Hz (air) and 45 Hz (water) along the X-axis, and 45 Hz (air) and 30 Hz (water) along the Y-axis.
  • OR-PAM demonstrated high SNRs, successfully imaging micro-patterned samples and mouse ear microvasculature with 3.6 μm lateral and 26 μm axial resolution.

Conclusions:

  • The developed PDMS-based waterproof scanner enables compact and high-performance OR-PAM.
  • The system offers high resolution and wide field-of-view imaging capabilities.
  • This technology holds significant potential for preclinical and clinical applications.