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Far field during sonication experiments in vitro - Is it really far enough?

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In vitro ultrasound bioeffects studies often assume uniform exposure, but samples in sonication vessels experience non-uniform near-field patterns. Designing vessels tailored to specific ultrasound transducers is crucial for accurate experimental results.

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Area of Science:

  • Acoustics
  • Biophysics
  • Materials Science

Background:

  • In vitro ultrasound bioeffects research typically places samples in the far-field for uniform exposure.
  • The actual acoustic field experienced by samples within sonication vessels is often not well characterized.

Purpose of the Study:

  • To evaluate the uniformity of the ultrasound field experienced by samples in common and 3D-printed culture plates.
  • To investigate the development of near-field patterns within sonication vessels.
  • To propose guidelines for sonication vessel design.

Main Methods:

  • Measurements of the ultrasound field using a needle hydrophone at 3.5 MHz and 7 MHz.
  • Analysis of acoustic intensity within and behind standard and 3D-printed culture plates.
  • Comparison with theoretical calculations and ultrasound field simulations.

Main Results:

  • Samples in sonication vessels, even in the far-field, are exposed to near-field patterns due to ultrasound-plate interactions.
  • Local acoustic intensity variations within vessels can exceed several hundred percent.
  • The creation of near-field patterns can be influenced by vessel design.

Conclusions:

  • Standard assumptions of uniform ultrasound exposure in vitro may be inaccurate.
  • Sonication vessel design significantly impacts the acoustic field experienced by samples.
  • Tailoring sonication vessel geometry to specific ultrasound transducers is recommended for future studies.