Noninvasive thermometer for HIFU and its scaling

Area of Science:

• Biomedical Engineering
• Medical Physics
• Acoustics

Background:

• Noninvasive temperature monitoring is crucial for various medical applications, including thermal therapy and diagnostics.
• Existing methods for tissue temperature measurement often have limitations in accuracy, invasiveness, or spatial resolution.

Purpose of the Study:

• To present and validate a novel acoustic-inversion method for noninvasive temperature measurement in biological tissues.
• To demonstrate the feasibility of using ultrasound spectral analysis for quantitative temperature assessment.

Main Methods:

• Utilized a B-scan ultrasound system operating in M-mode to acquire echo signals from tissue.
• Recorded ultrasound echoes reflected from a specific tissue surface before and after a heating event.
• Processed the acquired echo signals using Fast Fourier Transform (FFT) to obtain spectral data.
• Applied a theoretical acoustic-inversion formula and an optimization algorithm to fit spectral data and determine temperature changes.

Main Results:

• Successfully implemented the acoustic-inversion method to analyze ultrasound spectral shifts.
• Quantified temperature changes in tissue based on the alterations in spectral characteristics.
• Demonstrated the potential for accurate, noninvasive temperature monitoring.

Conclusions:

• The acoustic-inversion method offers a promising noninvasive approach for real-time tissue temperature measurement.
• This technique has potential applications in thermal therapy monitoring and other clinical scenarios requiring precise temperature assessment.