Ultrasonic measurement of sound velocity fluctuations in biological tissue due to ultrasonic heating and estimation of thermo-physical properties

Tsujimoto, Yukako; Morimoto, Mai; Nitta, Naotaka; Akiyama, Iwaki

doi:10.1007/s10396-018-0916-8

Cited by 10 publications

(15 citation statements)

References 21 publications

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“…Therefore, the present study used ultrasound in order to indicate when an endodontic sealer had set completely. Variations in the speed of sound passing through a sample provides information on its viscoelastic properties, so that the faster the speed of sound, the greater the density of the material (Bozkurt et al, 2005; Sindi et al, 2015; Tsujimoto et al, 2019). The method involves short ultrasonic pulses (speed 90 m/s) that pass through the sample, but do not accumulate energy in the molecules of the material.…”

Section: Discussionmentioning

confidence: 99%

An ultrasonic‐based experimental model to evaluate the setting time of endodontic sealers

et al. 2021

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Aim To evaluate an ultrasonic‐based experimental model (US), to assess the setting time of AH Plus®, Bio‐C Sealer® and MTA Fillapex®, and compare the results obtained with ANSI/ADA specifications (2012). Methods To determine the setting time according to the ANSI/ADA specification, moulds measuring 10 mm (diameter) × 2 mm (thickness) were used, and for the US tests a transducer (1 MHz) and an oscilloscope were used. Fourier‐transform infrared spectroscopy (FTIR) was used to evaluate the changes on chemical structure at the different setting times found by the US and ANSI/ADA methods. After checking the normal distribution, setting time data were analysed using unilateral analysis of variance with Tukey‐HSD post‐test to compare the methods. Results AH Plus® and Bio‐C Sealer® had longer mean setting time values for the US method than for the ANSI/ADA (p < .05), whilst for MTA Fillapex® no significant difference was found between the methods (p < .05). FTIR spectra demonstrated that at the setting time determined by the US method, AH Plus® and Bio‐C Sealer® were in a more advanced stage of polymerization than at the ANSI/ADA, whilst there was no significant difference for MTA Fillapex®. Conclusions The use of US was effective for setting time determination and measured longer values than ANSI/ADA specification for AH Plus® and Bio‐C Sealer®, identifying the entire (and not only superficial) setting of the endodontic sealers.

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Section: Discussionmentioning

confidence: 99%

An ultrasonic‐based experimental model to evaluate the setting time of endodontic sealers

et al. 2021

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“…3, whereas the fat-rich tissue has a negative temperature coefficient, as shown in Fig. 4 [13]. That is, when the biological tissue is heated, the sound velocity in the lean tissue increases, while it decreases in fat-rich tissue.…”

Section: Ultrasonic Diagnosis Of Liver Cancermentioning

confidence: 91%

“…Alternatively, ongoing research is being conducted to explore the potential of the thermophysical properties of biological tissues for NASH diagnosis [13]. These thermophysical properties include volumetric heat capacity, thermal diffusivity, and the perfusion time constant.…”

Section: Ultrasonic Diagnosis Of Liver Cancermentioning

confidence: 99%

“…That is, when the biological tissue is heated, the sound velocity in the lean tissue increases, while it decreases in fat-rich tissue. Therefore, the fat content of tissue can be characterized by measuring the change in sound velocity that occurs when biological tissue is heated non-invasively with ultrasonic waves [13]. Measurements of the rate of change in sound velocity between normal livers and those affected by hepatocellular carcinoma (HCC) in rats were 1:07 AE 0:02 m/s/ C and 1:59 AE 0:04 m/s/ C, respectively [15].…”

Section: Ultrasonic Diagnosis Of Liver Cancermentioning

confidence: 99%

“…Fig.4Temperature dependence of sound velocity change in porcine fat[13]. Measured values are plotted as black circles.…”

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Basic and recent applied technologies of ultrasound in the field of clinical diagnosis

Akiyama

2020

Acoust. Sci. & Tech.

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This paper reviews the basic imaging methods available using ultrasonic diagnostic equipment, including the pulse-echo method, beamforming for improving image resolution, and harmonic imaging using the nonlinearity of ultrasonic waves. Further topics discussed include the use of the pulse Doppler method in blood flow measurement, and the differential diagnosis of benign and malignant tumor via the contrast echo method using microbubbles. Of particular relevance, the characteristic ultrasound image features used to inform the diagnosis of pneumonia severity, which is important in planning the treatment of COVID-19 patients, are described. Finally, a bird's eye view of future trends in ultrasonic diagnosis is provided.

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Characterizing Temperature-Dependent Acoustic and Thermal Tissue Properties for High-Intensity Focused Ultrasound Computational Modeling

Sanderson,

Easthope,

Farias

et al. 2024

Int J Thermophys

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Ultrasonic measurement of sound velocity fluctuations in biological tissue due to ultrasonic heating and estimation of thermo-physical properties

Cited by 10 publications

References 21 publications

An ultrasonic‐based experimental model to evaluate the setting time of endodontic sealers

An ultrasonic‐based experimental model to evaluate the setting time of endodontic sealers

Basic and recent applied technologies of ultrasound in the field of clinical diagnosis

Characterizing Temperature-Dependent Acoustic and Thermal Tissue Properties for High-Intensity Focused Ultrasound Computational Modeling

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