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Related Experiment Video

Updated: Sep 12, 2025

Real-time Monitoring of High Intensity Focused Ultrasound HIFU Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound HMIFU
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Monitoring Fractionation in Elastic Tissues Using High Frame-Rate Doppler Ultrasound.

Jake Elliott1, Julianna C Simon1

  • 1Graduate Program in Acoustics, Pennsylvania State University, University Park, PA, USA.

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|August 5, 2025
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Summary

Bubble-induced color Doppler (BCD) shows promise for monitoring tissue fractionation during histotripsy in elastic tissues, outperforming passive cavitation imaging (PCI). Further research may combine both methods for optimal monitoring.

Keywords:
Bubble-induced color DopplerDoppler ultrasoundFocused ultrasoundHistotripsyHydrogelsPassive cavitation imagingTendonTherapeutic ultrasoundTreatment monitoring

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Area of Science:

  • Ultrasound
  • Biomedical Engineering
  • Acoustic Imaging

Background:

  • Histotripsy uses focused ultrasound (FUS) to break down tissues.
  • Passive cavitation imaging (PCI) and bubble-induced color Doppler (BCD) monitor tissue liquefaction.
  • Elastic tissues fractionate differently than they liquefy, posing monitoring challenges.

Purpose of the Study:

  • To compare PCI and BCD for monitoring FUS-induced fractionation in elastic tissues.
  • To evaluate the efficacy of PCI and BCD in both tissue-mimicking phantoms and ex vivo tendons.

Main Methods:

  • Telocollagen and elastic resin phantoms, plus ex vivo bovine tendons (healthy and tendinopathic), were used.
  • Samples were treated with 1.5 MHz FUS pulses.
  • Treatment progression was monitored using PCI and BCD.

Main Results:

  • BCD showed a better correlation with liquefaction in telocollagen samples compared to PCI.
  • Histotripsy induced fractionation in a majority of tendon samples.
  • BCD indicated higher regression coefficient magnitudes during fractionation than PCI, though with inconsistent directions.

Conclusions:

  • Doppler metrics from BCD show potential for monitoring FUS-induced fractionation in elastic tissues.
  • A combination of PCI and BCD may offer improved monitoring capabilities.