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Daohuai Jiang1, Hengrong Lan2,3, Shangqing Tong4

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Summary

This study introduces a novel signal-domain method for dual-speed-of-sound (dual-SoS) photoacoustic tomography (PAT) imaging. It significantly improves image quality and enables real-time dynamic imaging of heterogeneous tissues.

Keywords:
Image reconstructionPhotoacoustic tomographySpeed correctionSpeed of sound

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Area of Science:

  • Biomedical imaging
  • Photoacoustic imaging
  • Medical physics

Background:

  • Photoacoustic tomography (PAT) is a hybrid imaging modality combining optical and acoustic properties.
  • Heterogeneous speed of sound (SoS) in biological tissues degrades PAT image quality.
  • Existing dual-SoS methods are computationally intensive, hindering real-time dynamic imaging.

Purpose of the Study:

  • To develop a computationally efficient, signal-domain method for real-time dynamic dual-SoS PAT imaging.
  • To improve image quality in PAT by accurately accounting for SoS variations.
  • To overcome the limitations of existing dual-SoS reconstruction techniques.

Main Methods:

  • A novel signal-domain dual-SoS correction method is proposed for PAT image reconstruction.
  • Two distinct SoS regions are identified based on photoacoustic signal contours.
  • Image reconstruction is performed using corrected signals based on respective SoS values.

Main Results:

  • The proposed method significantly enhances image quality compared to single-SoS reconstruction.
  • Achieved a 12-fold reduction in resolution error and a 30% increase in contrast.
  • Enabled real-time dual-SoS dynamic PAT reconstruction at 10 fps, 187.22% faster than existing methods.

Conclusions:

  • The developed signal-domain dual-SoS correction method is effective for real-time dynamic PAT imaging.
  • This approach significantly improves image resolution and contrast in heterogeneous tissues.
  • The method shows high feasibility for clinical applications requiring dynamic imaging of biological tissues.