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Isolation of microbubbles beyond Sparrow's resolution limit in super-resolution ultrasonography using phase patterned

Junseok An1, Naohiro Sugita2, Tadahiko Shinshi2

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Summary

This study introduces phase patterned waves (PPWs) to isolate microbubbles (MBs) in super-resolution ultrasonography (SR-US). This method enables higher MB concentrations, reducing acquisition time for high-speed SR-US imaging.

Keywords:
bubble oscillationdetection efficiencyphase-patterned ultrasound wavessuper-resolution ultrasonographyultrasound contrast agents

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Area of Science:

  • Medical Imaging
  • Acoustic Physics
  • Biomedical Engineering

Background:

  • Super-resolution ultrasonography (SR-US) offers detailed microvasculature imaging for enhanced diagnostics.
  • Current SR-US methods require low concentrations of microbubbles (MBs), leading to lengthy data acquisition times.
  • Efficiently imaging at higher MB concentrations is crucial for advancing SR-US speed and diagnostic capabilities.

Purpose of the Study:

  • To develop and validate a novel method for isolating and detecting individual microbubbles (MBs) at high concentrations.
  • To enable high-speed super-resolution ultrasonography (SR-US) by reducing acoustic data acquisition times.
  • To improve the efficiency and accuracy of MB detection in SR-US imaging.

Main Methods:

  • Utilized phase patterned waves (PPWs) to precisely control the sound pressure and isolate individual MBs by adjusting their point spread function (PSF) intensities.
  • Exploited destructive interference in PPWs to achieve axial distance discrimination of MBs, complementing lateral discrimination.
  • Combined lateral and axial position estimations to determine precise 2D coordinates of MBs, even when closely spaced.

Main Results:

  • Achieved accurate MB position estimation within 25% of the wavelength, surpassing Sparrow's resolution limit for closely located MBs.
  • Improved positional accuracy to an average of 15% of the wavelength using an overlapped PSF model, irrespective of MB proximity or number.
  • Demonstrated the capability to isolate and detect individual MBs effectively even at high concentrations.

Conclusions:

  • The developed PPW-based method successfully isolates individual MBs at high concentrations, overcoming limitations of conventional ultrasound plane waves.
  • This technique significantly reduces acoustic data acquisition time, paving the way for high-speed SR-US.
  • The enhanced MB detection accuracy holds promise for improved diagnostic precision and clinical applications of SR-US.