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This study aims to quantitatively analyze the refocused acoustic field produced by high-intensity focused ultrasound therapies.

Optical measurement of transient change in high-intensity focused ultrasound fields by interference with multiply reflected waves

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This study aims to quantitatively analyze the refocused acoustic field produced by high-intensity focused ultrasound therapies.
Utilized the optical shadowgraph method to visualize phase shifts in ultrasound fields.
Conducted experiments with 1-MHz ultrasound, varying exposure times from 250 to 1000 μs.
Measured acoustic pressure using a fiber-optic hydrophone for accuracy validation.
At a driving voltage of 60 V, a pressure increase of approximately 1.36-fold was observed due to wave interference.
At a driving voltage of 160 V, bubbles were generated at times and locations consistent with the pressure increase caused by interference.
Findings indicate significant influences of the refocused phenomenon on ultrasound bubble behavior.

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Randomized trial analyzes pressure increase in ultrasound fields using optical techniques, suggesting new insights into bubble behavior.

Ono et al. (2025) studied this question.

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