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Subharmonic and ultraharmonic emissions for emboli detection and characterization
P Palanchon1, A Bouakaz, J Klein
1Departments of Cardiology, Erasmus Medical Center, Rotterdam, The Netherlands. p.palanchon@erasmusmc.nl
Ultrasound in Medicine & Biology
|April 23, 2003
Summary
This study introduces a novel method for detecting and sizing gaseous emboli using nonlinear acoustic properties. The technique accurately characterizes bubbles within a specific size range, crucial for patient treatment during surgery.
Area of Science:
- Biomedical Engineering
- Acoustic Physics
Background:
- Emboli detection and characterization are critical for patients undergoing procedures like carotid or cardiac surgery.
- Emboli can be particulate or gaseous, necessitating accurate classification and sizing for effective treatment and risk reduction.
Purpose of the Study:
- To develop and validate an approach for characterizing and sizing gaseous emboli.
- To investigate the nonlinear acoustic properties of air bubbles for emboli analysis.
Main Methods:
- Generation of uniform air bubbles with diameters ranging from 40 to 120 micrometers.
- Acoustic measurements focusing on subharmonic and ultraharmonic frequency components.
- Analysis of bubble response at various acoustic pressures.
Main Results:
- Subharmonic and ultraharmonic components were generated by bubbles between 58 and 110 micrometers.
- Bubbles outside this size range exhibited different acoustic behaviors.
- The study identified specific acoustic pressure and scanning frequency ranges for optimal detection.
Conclusions:
- The proposed nonlinear acoustic approach effectively characterizes and sizes gaseous emboli.
- This method provides essential information for classifying emboli, aiding clinical decision-making.
- The findings contribute to improved patient safety in surgical interventions involving potential emboli.