Focused Ultrasound Thermometry: A Two-Dimensional Resistance Temperature Detector Array in a Tissue-Mimicking Material

Yang, Inseok; Kim, Yong Tae; Doh, Il

doi:10.1109/jsen.2021.3116589

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…(22) The expanded standard uncertainty of sample parameters U0(eyi) in case when the air parameters are not estimated can be obtained from ( 20)-( 22) by substituting σ(ecair) and σ(eρair) by σ0(ecair) and σ0(eρair) from ( 18) and (19). The uncompensated uncertainty U0 is obtained.…”

Section: Uncertainty Estimationmentioning

confidence: 99%

“…The expected outdoor temperature variation in the range -10-+40 °C and pressure variation in the range 94-105 kPa will cause -3.2-+3.6% errors for sample thickness, -0.1-+ 15.1% errors for density and -6.8-+ 6.8% errors for ultrasound velocity in the sample. There is a solution for the measurements under controlled conditions: air temperature (or even pressure) can be measured using thermometer and then air parameters can be estimated from such readings [19]. However, air parameters react to temperature immediately, but thermometer reaction is slow.…”

Section: Introductionmentioning

confidence: 99%

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Air-Coupled Ultrasound Spectroscopy Air Parameters Compensation Technique

Nakutis,

Kaškonas,

Liaukonis

et al. 2024

IEEE Sensors J.

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The air-coupled resonance ultrasound spectroscopy (RUS) of thin plate thickness, density, ultrasound velocity and attenuation measurement are affected by air parameters. If air parameters are left unaccounted errors will occur. Conventional thermometer measurements are not efficient because temperature can vary faster than temperature sensor response. Technique for air parameters estimation and compensation of the RUS inverse solution results is proposed. The ultrasound delay over known distance is used for velocity in air estimation. There is no need for the additional measurement: the propagation time between transducers can be obtained from RUS calibration measurement. Ultrasound velocity in air is then used for temperature estimation. These measurements are augmented by pressure sensor measurement for air density estimation. Evaluation of the attainable measurement errors and analysis of uncertainties under such compensation was carried out using simulated signals. Sensitivity coefficients for every parameter were derived and attainable errors evaluated for temperature range from -5 °C to +40 °C and atmospheric pressure range from 94 kPa to 105 kPa. It was concluded that the relative uncertainty of sample attenuation, ultrasound velocity attenuation, density and thickness could be reduced approximately 22 times compared to case when air parameters are assumed to be equal to those in normal conditions. Experimental verification used 2 mm polycarbonate plate, measured values were compared against reported data. Experiment confirmed the efficiency of the proposed compensation: thickness estimation bias errors were reduced 17 times, bias errors for density were reduced 15 times and velocity estimation bias errors were reduced 5 times.

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Section: Uncertainty Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Air-Coupled Ultrasound Spectroscopy Air Parameters Compensation Technique

Nakutis,

Kaškonas,

Liaukonis

et al. 2024

IEEE Sensors J.

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Noncontact 2-D Temperature Imaging of Metallic Foils Using Electromagnetic Tomography

2023

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Response Time of a Thin-Film Resistance Temperature Detector (RTD) for High-Intensity Focused Ultrasound (HIFU) Phantom Applications

Lequiron,

Joe,

Lim

et al. 2023

Applied Sciences

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The thermal response time of a thin-film resistance temperature detector (RTD) array sensor was measured for a high-intensity focused ultrasound (HIFU) phantom. As the temperature inside materials change rapidly within several seconds, it is important to have a temperature sensor with a fast response time to evaluate their performance. However, previous methods for measuring thermal response time were not suitable for thin-film sensors, and there were no quantitative data available. In this study, we used a liquid drop method to measure the thermal time constant of the thin-film RTD, which was found to be 1.0 ± 0.2 ms. This indicates that the thin-film RTD array sensor has a sufficiently fast response time to detect sudden temperature changes inside the tissue-mimicking material (TMM) for validating HIFU devices.

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Focused Ultrasound Thermometry: A Two-Dimensional Resistance Temperature Detector Array in a Tissue-Mimicking Material

Cited by 3 publications

References 31 publications

Air-Coupled Ultrasound Spectroscopy Air Parameters Compensation Technique

Air-Coupled Ultrasound Spectroscopy Air Parameters Compensation Technique

Noncontact 2-D Temperature Imaging of Metallic Foils Using Electromagnetic Tomography

Response Time of a Thin-Film Resistance Temperature Detector (RTD) for High-Intensity Focused Ultrasound (HIFU) Phantom Applications

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