Temperature dependence of speed of sound and attenuation of porcine left ventricular myocardium

Füzesi, Krisztián; Ilyina, Natalia; Verboven, Erik; Abeele, Koen Van Den; Gyöngy, Miklós; D'hooge, Jan

doi:10.1016/j.ultras.2017.09.003

Cited by 8 publications

(7 citation statements)

References 26 publications

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“…The principle of ultrasonic non‐invasive temperature measurement is mainly based on the change of acoustic characteristics of biological tissue before and after heating to reflect the temperature of the human body, and the acoustic characteristics mainly include sound velocity, sound attenuation and scattering amplitude. In the past decade, the correlation between ultrasonic propagation velocity and temperature has attracted a lot of researchers 4–8 . By calculating the time deviation of the received echo, the temperature change of the heated tissue can be estimated.…”

Section: Introductionmentioning

confidence: 99%

“…In the past decade, the correlation between ultrasonic propagation velocity and temperature has attracted a lot of researchers. [4][5][6][7][8] By calculating the time deviation of the received echo, the temperature change of the heated tissue can be estimated. In addition, many studies have shown that ultrasonic echo attenuation is also strongly correlated with temperature, which can also be used to monitor tissue temperature.…”

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confidence: 99%

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Temperature Monitoring During Microwave Hyperthermia Based on BP‐Nakagami Distribution

Liu

Meng

et al. 2023

J of Ultrasound Medicine

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ObjectiveThe purpose of this study is to accurately monitor temperature during microwave hyperthermia. We propose a temperature estimation model BP‐Nakagami based on neural network for Nakagami distribution.MethodsIn this work, we designed the microwave hyperthermia experiment of fresh ex vivo pork tissue and phantom, collected ultrasonic backscatter data at different temperatures, modeled these data using Nakagami distribution, and calculated Nakagami distribution parameter m. A neural network model was built to train the relationship between Nakagami distribution parameter m and temperature, and a BP‐Nakagami temperature model with good fitting was obtained. The temperature model is used to draw the two‐dimensional temperature distribution map of biological tissues in microwave hyperthermia. Finally, the temperature estimated by the model is compared with the temperature measured by thermocouples.ResultsThe error between the temperature estimated by the temperature model and the temperature measured by the thermocouple is within 1°C in the range of 25°C–50°C for ex vivo pork tissue, and the error between the temperature estimated by the temperature model and the temperature measured by the thermocouple is within 0.5°C in the range of 25°C–50°C for phantom.ConclusionsThe results show that the temperature estimation model proposed by us is an effective model for monitoring the internal temperature change of biological tissues.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Temperature Monitoring During Microwave Hyperthermia Based on BP‐Nakagami Distribution

Liu

Meng

et al. 2023

J of Ultrasound Medicine

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“…Major acoustic approaches to the non-invasive measurement of the distribution of internal body temperature have been developed. Such methods are based on the temperature dependence of the ultrasound propagation speed and ultrasonic attenuation coefficient (Fujii and Zhang 2001;Varghese et al 2002;Daniels et al 2007;van Dongen and Verweij 2011;Liu et al 2017;Füzesi et al 2018). However, both the ultrasound propagation speed and ultrasonic attenuation coefficient need to be estimated with a precise ultrasound propagation path length and propagation time.…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis of Ultrasonic Scattered Echoes Enables the Non-invasive Measurement of Temperature Elevations inside Tumor Tissue during Oncological Hyperthermia

Takeuchi

Sakai²,

Andócs

et al. 2021

Ultrasound in Medicine & Biology

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Non-invasive monitoring of temperature elevations inside tumor tissue is imperative for the oncological thermotherapy known as hyperthermia. In the present study, two cancer patients, one with a developing right renal cell carcinoma and the other with pseudomyxoma peritonei, underwent hyperthermia. The two patients were irradiated with radiofrequency current for 40 min during hyperthermia. We report the results of our clinical trial study in which the temperature increases inside the tumor tissues of patients with right renal cell carcinoma and pseudomyxoma peritonei induced by radiofrequency current irradiation for 40 min could be detected by statistical analysis of ultrasonic scattered echoes. The Nakagami shape parameter m varies depending on the temperature of the medium. We calculated the Nakagami shape parameter m by statistical analysis of the ultrasonic echoes scattered from the tumor tissues. The temperature elevations inside the tumor tissues were expressed as increases in brightness on 2-D hot-scale maps of the specific parameter a mod , indicating the absolute values of the percentage changes in m values. In the a mod map for each tumor tissue, the brightness clearly increased with treatment time. In quantitative analysis, the mean values of a mod were calculated. The mean value of a mod for the right renal cell carcinoma increased to 1.35 dB with increasing treatment time, and the mean value of a mod for pseudomyxoma peritonei increased to 1.74 with treatment time. The increase in both a mod brightness and the mean value of a mod implied temperature elevations inside the tumor tissues induced by the radiofrequency current; thus, the acoustic method is promising for monitoring temperature elevations inside tumor tissues during hyperthermia.

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“…Previous studies using ultrasound-based thermometry have focused on the change in the pulse-echo transit time, pulse-echo strain (axial gradient of the displacement), [5][6][7][8] and echogenicity level or texture in an ultrasound image 9,10 to estimate the temperature shift. Acoustic radiation force imaging in a high-intensity focused ultrasound treatment has also been used to assess the displacement in the coagulation region.…”

Section: Introductionmentioning

confidence: 99%

A study on understanding the physical mechanism of change in ultrasonic envelope statistical property during temperature elevation

Omura

Takeuchi²,

Nagaoka

et al. 2021

Medical Physics

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Purpose Our previous studies demonstrate that the variation in ultrasonic envelope statistics is correlated with the temperature change inside scattering media. This variation is identified as the change in the scatterer structure during thermal expansion or contraction. However, no specific evidence has been verified to date. This study numerically reproduces the change in the scatterer distribution during thermal expansion or contraction using finite element simulations and also investigates how the situation is altered by different material properties. Methods The material properties of a linear elastic solid depend on the thermal expansion coefficient, thermal conductivity, specific heat, and initial scatterer number density. Three‐dimensional displacements, calculated in the simulation, were sequentially used to update the positions of the randomly distributed scatterers. Ultrasound signals from the scatterer distribution were generated by simulating a 7.5‐MHz linear array transducer whose specifications were the same as those in the experimental measurements of several phantoms and excised porcine livers. To represent the change in the envelope statistical feature, the absolute value of the ratio change in the logarithmic Nakagami (NA) parameter, Δm, at each time was calculated as a value normalized with the initial NA parameter. Results The change in the scatterer number density relates to the volume change during temperature elevation. The magnitude of the Δm shift against the temperature change increases depending on the higher thermal expansion coefficient. In contrast, the relationship between Δm and the scatterer number density is similar with any material property. Additionally, the changes in Δm obtained by several experimental phantoms with low to high scatterer number densities are comparable with the numerical simulation results. Conclusions The change in Δm is indirectly related to the change in the scatterer number density owing to the volume change during thermal expansion or contraction.

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Temperature dependence of speed of sound and attenuation of porcine left ventricular myocardium

Cited by 8 publications

References 26 publications

Temperature Monitoring During Microwave Hyperthermia Based on BP‐Nakagami Distribution

Temperature Monitoring During Microwave Hyperthermia Based on BP‐Nakagami Distribution

Statistical Analysis of Ultrasonic Scattered Echoes Enables the Non-invasive Measurement of Temperature Elevations inside Tumor Tissue during Oncological Hyperthermia

A study on understanding the physical mechanism of change in ultrasonic envelope statistical property during temperature elevation

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