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Author Spotlight: Integrated Photoacoustic, Ultrasound, and Angiographic Tomography (PAUSAT) for NonInvasive Whole-Brain Imaging of Ischemic Stroke
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Multiview Hilbert transformation for full-view photoacoustic computed tomography using a linear array.

Guo Li1, Lei Li1, Liren Zhu1

  • 1Washington University in St. Louis, Department of Biomedical Engineering, Optical Imaging Laboratory, One Brookings Drive, St. Louis, Missouri 63130, United States.

Journal of Biomedical Optics
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This study introduces a high-frequency photoacoustic computed tomography (PACT) system using a linear transducer array. It achieves full-view imaging with improved spatial resolution for clearer biological sample visualization.

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Area of Science:

  • Biomedical Imaging
  • Optics and Photonics
  • Medical Physics

Background:

  • Linear ultrasonic transducer arrays are cost-effective for photoacoustic computed tomography (PACT).
  • Existing linear-array PACT systems have limited views and low-frequency transducers, restricting spatial resolution.
  • Full-view imaging necessitates object or transducer rotation.

Purpose of the Study:

  • To develop a multiview, high-frequency PACT system for enhanced spatial resolution.
  • To overcome the limitations of single-view imaging in linear-array PACT.
  • To enable high-resolution, full-view photoacoustic imaging.

Main Methods:

  • Implemented a multiview PACT system using a 40-MHz central frequency linear transducer array.
  • Acquired full-view photoacoustic data by rotating the object.
  • Developed a multiview Hilbert transformation method for accurate initial pressure quantification.

Main Results:

  • Achieved an isotropic in-plane spatial resolution of 60 μm within a 10×10 mm² field of view.
  • Demonstrated the system's capability with in vivo imaging of a zebrafish.
  • Successfully imaged a leaf skeleton, showcasing detailed structures.

Conclusions:

  • The developed multiview high-frequency PACT system significantly improves spatial resolution for full-view imaging.
  • This advancement enables detailed visualization of biological structures.
  • The system holds promise for advanced biomedical imaging applications.