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Three-dimensional Optical-resolution Photoacoustic Microscopy
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Autofocusing optical-resolution photoacoustic microscopy.

Tianxiang Zuo1, Jiaye Xu1, Yifan Yang2

  • 1MOE Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; Cambridge University - Nanjing Centre of Technology and Innovation, 23 Rongyue Road, Jiangbei New Area, Nanjing 210000, China.

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Summary
This summary is machine-generated.

This study introduces an automated focusing system for optical-resolution photoacoustic microscopy (OR-PAM), enhancing precision and speed. The autofocusing optical-resolution photoacoustic microscopy (AFOR-PAM) system simplifies operation for broader biomedical applications.

Keywords:
AutofocusBrenner gradient functionPhotoacoustic microscopySystem-on-Chip

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Area of Science:

  • Biomedical Imaging
  • Optical Microscopy
  • Photoacoustics

Background:

  • Optical-resolution photoacoustic microscopy (OR-PAM) offers high resolution but relies on precise focusing.
  • Current manual focusing methods are operator-dependent, imprecise, and time-consuming, limiting OR-PAM's practical use.

Purpose of the Study:

  • To develop an automated focusing system for OR-PAM to overcome limitations of manual focusing.
  • To improve the precision, speed, and reliability of OR-PAM focusing.

Main Methods:

  • Developed an autofocusing optical-resolution photoacoustic microscopy (AFOR-PAM) system.
  • Integrated 3D motorized scanning, System-on-Chip (SoC) for unified control, and a modified Brenner gradient autofocusing algorithm.

Main Results:

  • The AFOR-PAM system achieved automated focusing in 11 iterations and 1.4 seconds.
  • Demonstrated rapid, precise, and reliable focusing in phantom and in vivo (mouse ear) experiments.
  • Showcased robustness under low signal-to-noise ratio (SNR) conditions.

Conclusions:

  • The AFOR-PAM system provides a fully automated, operator-independent focusing solution.
  • This advancement significantly enhances the practical applicability of OR-PAM.
  • The system holds potential for broader use in clinical photoacoustic imaging settings.