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Lesion development in focused ultrasound surgery: a general model
C R Hill1, I Rivens, M G Vaughan
1Joint Department of Physics, Royal Marsden Hospital, Sutton, Surrey, UK.
Ultrasound in Medicine & Biology
|January 1, 1994
Summary
A new analytical model accurately predicts thermal lesion formation from focused ultrasound in tissue. This model aids in understanding focused ultrasound surgery (FUS) and proposes a standardized acoustic exposure measurement, ISAL.
Area of Science:
- Biomedical Engineering
- Acoustics
- Medical Physics
Background:
- Focused ultrasound (FUS) is used in minimally invasive surgery.
- Understanding thermal lesion formation is crucial for FUS safety and efficacy.
- Current methods for measuring acoustic exposure in FUS are inadequate.
Purpose of the Study:
- To develop an analytical model for thermal lesion formation in tissue exposed to focused ultrasound.
- To predict lesion initiation time and growth dynamics.
- To propose a standardized metric for acoustic exposure measurement in FUS.
Main Methods:
- Constructed an analytical model assuming Gaussian approximation for focused ultrasound beam shape.
- Incorporated thermal diffusion and blood perfusion effects.
- Validated model predictions against experimental data from excised pig liver and published data.
Main Results:
- The model accurately predicts lesion initiation time and growth in lateral and axial dimensions.
- Model predictions show good agreement with experimental measurements.
- Identified deficiencies in current acoustic exposure reporting practices for FUS.
Conclusions:
- The developed analytical model provides a robust framework for predicting thermal lesion formation during FUS.
- The proposed metric, intensity spatially averaged over the half-pressure-maximum contour (ISAL), offers improved metrological and biophysical relevance for acoustic exposure.
- This work contributes to enhancing the safety and precision of FUS procedures.