Noninvasive estimation of temperature elevations in biological tissues using acoustic nonlinearity parameter imaging
Xiaozhou Liu1, Xiufen Gong, Chang Yin
1Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing, China. xzliu@nju.edu.cn
Ultrasound in Medicine & Biology
|January 12, 2008
Summary
Acoustic nonlinearity imaging offers a novel, noninvasive method for monitoring temperature during hyperthermia treatments. This technique accurately measures temperature elevations in biological tissues, aiding treatment development.
Area of Science:
- Biomedical Engineering
- Acoustics
- Medical Imaging
Background:
- Noninvasive temperature monitoring is crucial for advancing hyperthermia treatment development.
- Current methods may have limitations in accurately assessing tissue temperature during treatment.
Purpose of the Study:
- To investigate the relationship between acoustic nonlinearity parameters and temperature in porcine fat and liver.
- To develop and validate a method for noninvasively imaging temperature elevations using acoustic nonlinearity parameters.
- To compare imaging-derived temperatures with thermocouple measurements and theoretical predictions.
Main Methods:
- Determined relationships between acoustic nonlinearity parameters and temperature in porcine fat and liver samples.
- Utilized ultrasound irradiation to induce temperature elevations in the samples.
- Employed acoustic nonlinearity parameter imaging for inverse temperature derivation and compared results with thermocouple measurements.
Main Results:
- Acoustic nonlinearity parameter imaging successfully derived temperature elevations in porcine fat and liver.
- Measured temperature elevations using imaging (fat: 22.0 +/- 1.4°C, liver: 16.9 +/- 1.1°C) closely matched thermocouple measurements (fat: 21.1 +/- 0.8°C, liver: 15.7 +/- 0.6°C).
- Derived temperatures were comparable to theoretical predictions (fat: 24.0°C, liver: 19.7°C).
Conclusions:
- Acoustic nonlinearity imaging demonstrates potential as a novel method for noninvasive temperature evaluation.
- This technique can accurately assess temperature changes in biological tissues, supporting hyperthermia applications.
- Further research may validate this imaging modality for real-time temperature monitoring in clinical hyperthermia.
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Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...