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Related Experiment Video

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Three-dimensional Optical-resolution Photoacoustic Microscopy
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Multiangle Long-Axis Lateral Illumination Photoacoustic Imaging Using Linear Array Transducer.

João H Uliana1, Diego R T Sampaio1, Guilherme S P Fernandes1

  • 1Department of Physics, FFCLRP, University of São Paulo, Ribeirão Preto 14040-901, SP, Brazil.

Sensors (Basel, Switzerland)
|July 26, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a new photoacoustic imaging illumination method for better light delivery. The long-axis lateral illumination technique improves image quality for various targets, enhancing clinical applications.

Keywords:
Monte Carloillumination schemein vivolinear arraymousephotoacoustic imaging

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Acoustic Engineering

Background:

  • Photoacoustic imaging (PAI) integrates optical contrast with ultrasound resolution for deep tissue imaging.
  • Conventional PAI systems often use dark-field illumination, which has limitations.
  • Bright-field illumination strategies have been proposed to address these limitations.

Purpose of the Study:

  • To propose and evaluate a novel multiangle long-axis lateral illumination scheme for photoacoustic imaging.
  • To compare the proposed scheme with existing bright-field and dark-field methods.
  • To demonstrate the feasibility and effectiveness of the new approach through simulations and experimental validation.

Main Methods:

  • Monte Carlo simulations were performed to assess light delivery efficiency for bright-field, dark-field, and long-axis lateral illumination.
  • A prototype system was developed featuring independently controllable fiber bundles attached to the transducer's long-axis.
  • Image acquisition involved coherent summation of subframes from multiple illumination angles.

Main Results:

  • Long-axis lateral illumination demonstrated significant improvements in light delivery, particularly for targets narrower than the transducer.
  • Experimental validation using phantoms, a mouse abdomen, and human subjects confirmed enhanced light delivery.
  • The system achieved sufficient signal-to-noise ratios at clinically relevant depths.

Conclusions:

  • The novel multiangle long-axis lateral illumination scheme offers enhanced light delivery in photoacoustic imaging.
  • This approach improves imaging performance by adapting to target geometry.
  • The developed prototype shows promise for clinical applications requiring deep tissue visualization.