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This study introduces a miniature photoacoustic probe using a novel transparent ultrasound transducer. The compact design enhances imaging efficiency for biomedical research in confined spaces.

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Area of Science:

  • Biomedical Engineering
  • Optical Imaging
  • Acoustic Technology

Background:

  • Photoacoustic technology offers valuable morphological and functional data in biomedical research.
  • Traditional photoacoustic probes are bulky due to coaxial designs and opaque piezoelectric layers.
  • Existing transparent ultrasound transducers remain large, limiting applications.

Purpose of the Study:

  • To develop a miniature photoacoustic probe for enhanced imaging efficiency.
  • To overcome the bulkiness limitations of current photoacoustic probe designs.
  • To enable photoacoustic applications in space-constrained environments.

Main Methods:

  • Developed a 4 mm outer diameter miniature photoacoustic probe.
  • Engineered an acoustic stack using transparent piezoelectric material and a gradient-index lens.
  • Integrated the transparent ultrasound transducer with a single-mode fiber ferrule.

Main Results:

  • The transparent ultrasound transducer achieved a ~47 MHz center frequency with a 29.4% -6 dB bandwidth.
  • The probe's compact design facilitates integration and improves imaging efficiency.
  • Successfully demonstrated fluid flow sensing and photoacoustic imaging capabilities.

Conclusions:

  • The developed miniature photoacoustic probe offers a compact and efficient solution for biomedical imaging.
  • The novel transparent ultrasound transducer design overcomes previous size limitations.
  • This technology holds promise for advanced photoacoustic applications in various research settings.