Temperature dependence of acoustic harmonics generated by nonlinear ultrasound wave propagation in water at various frequencies

Maraghechi, B.; Hasani, Mohammad; Kolios, Michael C.; Tavakkoli, Jahan

doi:10.1121/1.4946898

Cited by 20 publications

(12 citation statements)

References 17 publications

(27 reference statements)

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“…The authors claim that the nonlinear parameter can be effectively used in order to estimate the temperature in tissue medium. Temperature dependence of harmonics in different frequency ranges is reported in [28]. In this study the opposite dependency of nonlinear parameter to the temperature is detected in frequency ranges of 1, 3.3 MHz and 13, 20MHz.…”

Section: Active Thermometrymentioning

confidence: 48%

A Review of Ultrasound Thermometry Techniques

Amiri¹,

Makkiabadi²

2020

fbt

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Acoustic thermometry is one of non-invasive methods to measure the temperature inside tissue area. Especially, when using the thermal therapy techniques such as High Intensity Focused Ultrasound (HIFU) and other thermal based methods, thermal assessment of heated area seems to be necessary. Some of acoustic properties of medium are temperature dependent; therefore, evaluation of temperature dependent parameters will be an indirect and non-invasive approach in thermometry. In this paper some of thermometry methods based on changes in acoustic properties of medium have been reviewed. The published methods are classified in two main categories: passive and active thermometry. In the passive thermometry, the thermal measurement probes, induced no acoustic signals to the medium, but they receive the radiated signals from the heated medium. In active method, the thermometry probe transmits a signal into the heated region and receives the echoes, then the received RF signals are processed in order to measure the temperature.

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Section: Active Thermometrymentioning

confidence: 48%

A Review of Ultrasound Thermometry Techniques

Amiri¹,

Makkiabadi²

2020

fbt

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“…The ambient temperature has an influence on the wave propagation in a component. Since this also has an impact on the formation of the harmonic frequencies [37], the experiments were carried out at constant temperature. The experimental setup is shown in Figure 9.…”

Section: Experimental Validationmentioning

confidence: 99%

A Nonlinear Ultrasonic Modulation Method for Crack Detection in Turbine Blades

Mevissen

Meo

2020

Aerospace

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In modern gas turbines, efforts are being made to improve efficiency even further. This is achieved primarily by increasing the generated pressure ratio in the compressor and by increasing the turbine inlet temperature. This leads to enormous loads on the components in the hot gas region in the turbine. As a result, non-destructive testing and structural health monitoring (SHM) processes are becoming increasingly important to gas turbine manufacturers. Initial cracks in the turbine blades must be identified before catastrophic events occur. A proven method is the linear ultrasound method. By monitoring the amplitude and phase fluctuations of the input signal, structural integrity of the components can be detected. However, closed cracks or small cracks cannot be easily detected due to a low impedance mismatch with the surrounding materials. By contrast, nonlinear ultrasound methods have shown that damages can be identified at an early stage by monitoring new signal components such as sub- and higher harmonics of the fundamental frequency in the frequency spectrum. These are generated by distortion of the elastic waveform due to damage/nonlinearity of the material. In this paper, new global nonlinear parameters were derived that result from the dual excitation of two different ultrasound frequencies. These nonlinear features were used to assess the presence of cracks as well as their qualitative sizes. The proposed approach was tested on several samples and turbine blades with artificial and real defects. The results were compared to samples without failure. Numerical simulations were conducted to investigate nonlinear elastic interaction of the stress waves with the damage regions. The results show a clear trend of nonlinear parameters changing as a function of the crack size, demonstrating the capability of the proposed approach to detect in-service cracks.

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“…Simulations were performed to study the temperature dependence of the harmonic's amplitude in a lossless medium in transmit mode for a plane wave of finite amplitude [29]. Maraghechi et al studied the temperature dependence of harmonics' amplitudes and their ratios in water at several frequencies and showed that harmonics are monotonically increasing functions of temperature at 13 MHz [30].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of detecting change in backscattered energy of acoustic harmonics in locally heated tissues

Maraghechi

Kolios

Tavakkoli

2019

International Journal of Hyperthermia

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Purpose: A real-time noninvasive thermometry technique is required to estimate the temperature distribution during hyperthermia to monitor and control the treatment. The main objective of this study is to demonstrate the possibility of detecting change in backscatter energy (CBE) of acoustic harmonics in tissue-mimicking gel phantoms and ex vivo bovine muscle tissues in which the temperature was locally increased within the hyperthermia regime. Materials and Methods: A peristaltic pump was used to circulate hot water through a needle inserted inside the samples to locally increase the temperature from 26 C to 46 C. The CBE of acoustic harmonics were used to identify the location of temperature changes in the samples. A conventional echo-shift technique was also implemented for comparison. Data collection was performed for two conditions to investigate the effect of motion on both techniques by: (1) inducing vibration in the sample through the peristatic pump and, (2) subsequently with no sample vibration while the pump was off. Results: Harmonics were able to determine the location of temperature rise in the presence and absence of vibration. In gel phantom, the mean contrast to noise ratio (CNR) in CBE maps reduced by a factor of 0.86 due to vibration whereas in gradient maps the CNR reduced by a factor of 8.3. Conclusions: The findings of this study suggest that the change in backscatter energy of acoustic harmonics can potentially be used to develop a noninvasive ultrasound-based thermometry technique with lower susceptibility to motion artifacts compared to the echo-shift method.

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Temperature dependence of acoustic harmonics generated by nonlinear ultrasound wave propagation in water at various frequencies

Cited by 20 publications

References 17 publications

A Review of Ultrasound Thermometry Techniques

A Review of Ultrasound Thermometry Techniques

A Nonlinear Ultrasonic Modulation Method for Crack Detection in Turbine Blades

Feasibility of detecting change in backscattered energy of acoustic harmonics in locally heated tissues

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