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Numerical modeling of ultrasound heating for the correction of viscous heating artifacts in soft tissue temperature measurements
- Source :
- Appl Phys Lett
- Publication Year :
- 2019
-
Abstract
- Measuring temperature during focused ultrasound (FUS) procedures is critical for characterization, calibration, and monitoring to ultimately ensure safety and efficacy. Despite the low cost and the high spatial and temporal resolutions of temperature measurements using thermocouples, the viscous heating (VH) artifact at the thermocouple-tissue interface requires reading corrections for correct thermometric analysis. In this study, a simulation pipeline is proposed to correct the VH artifact arising from temperature measurements using thermocouples in FUS fields. The numerical model consists of simulating a primary source of heating due to ultrasound absorption and a secondary source of heating from viscous forces generated by the thermocouple in the FUS field. Our numerical validation found that up to 90% of the measured temperature rise was due to VH effects. Experimental temperature measurements were performed using thermocouples embedded in fresh chicken breast samples. Temperature corrections were demonstrated for single high-intensity FUS pulses at 3.1 MHz and for multiple pulses (3.1 MHz, 100 Hz, and 500 Hz pulse repetition frequency). The VH accumulated during sonications and produced a temperature increase of 3.1 °C and 15.3 °C for the single and multiple pulse sequences, respectively. The methodology presented here enables the decoupling of the temperature increase generated by absorption and VH. Thus, more reliable temperature measurements can be extracted from thermocouple measurements by correcting for VH.
- Subjects :
- 010302 applied physics
Pulse repetition frequency
Artifact (error)
Materials science
Physics and Astronomy (miscellaneous)
business.industry
Acoustics
Ultrasound
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Temperature measurement
Secondary source
Thermocouple
0103 physical sciences
Calibration
Biophysics, Biomaterials, Liquids, and Soft Matter
0210 nano-technology
Absorption (electromagnetic radiation)
business
Subjects
Details
- ISSN :
- 00036951
- Volume :
- 114
- Issue :
- 20
- Database :
- OpenAIRE
- Journal :
- Applied physics letters
- Accession number :
- edsair.doi.dedup.....fc4539abfc50f5d6a851f4f0c3b1620f