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Generalized spatial coherence reconstruction for photoacoustic computed tomography.

Jorge Tordera Mora1, Xiaohua Feng1, Nikhila Nyayapathi2

  • 1UCLA Samueli School of Engineering, Univ. of California, Los Angeles, United States.

Journal of Biomedical Optics
|April 21, 2021
PubMed
Summary

A new generalized spatial coherence (GSC) algorithm unifies existing methods for improved photoacoustic image reconstruction. GSC enhances resolution and contrast in photoacoustic computed tomography (PACT) beyond previous techniques.

Keywords:
beamformerphotoacoustic tomographyspatial coherence

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Area of Science:

  • Optics and Photonics
  • Biomedical Imaging
  • Signal Processing

Background:

  • Spatial coherence is crucial for photoacoustic image reconstruction.
  • Existing methods like SLSC and FDMAS utilize spatial coherence but have limitations.
  • SLSC lacks relative signal magnitude preservation, and FDMAS has reduced contrast-to-noise ratio.

Purpose of the Study:

  • Develop a unified beamforming algorithm, generalized spatial coherence (GSC), to overcome limitations of prior methods.
  • Improve resolution and contrast in photoacoustic image reconstruction.
  • Outperform existing beamformers in PACT.

Main Methods:

  • Introduced the generalized spatial coherence (GSC) beamforming algorithm.
  • Unified short-lag spatial coherence (SLSC) and filtered delay, multiply, and sum (FDMAS) into a single GSC equation.
  • Validated GSC in photoacoustic computed tomography (PACT) using simulations and experimental data.

Main Results:

  • GSC demonstrated superior performance compared to delay-and-sum (DAS), FDMAS, and SLSC.
  • GSC outperformed state-of-the-art coherence-based beamformers in imaging metrics.
  • Results were consistent across both simulated and experimental PACT data.

Conclusions:

  • Generalized spatial coherence (GSC) is an innovative reconstruction algorithm for PACT.
  • GSC combines the strengths of FDMAS and SLSC, offering enhanced performance.
  • The GSC algorithm expands the potential applications of PACT.