Passive estimation of internal temperatures making use of broadband ultrasound radiated by the body

Аносов, А. А.; Kazansky, Alexandr S.; Subochev, Pavel; Mansfel’d, A. D.; Klinshov, Vladimir

doi:10.1121/1.4915483

Cited by 15 publications

(8 citation statements)

References 35 publications

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“…This method allows distinguishing weak noise signals, which include thermal acoustic radiation, against the background of the receiver's natural noise. Detailed analysis of the modulation AT based on the results of [3][4][5][6] showed that the minimum detected temperature difference is much worse than the maximum allowable one calculated theoretically. In addition to this drawback, such an AT has limited application due to the need for a priori knowledge of frequency-dependent absorption coefficients and measurements at two frequencies.…”

Section: Literature Review and Problem Statementmentioning

confidence: 82%

Experimental researching of biological objects noninvasive passive acoustothermometry features

Didkovskyi

Naida

Drozdenko

et al. 2020

EEJET

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Radio and acoustic thermometry allow measuring the temperature of internal tissues at depths of several centimeters, which is of interest in early diagnosis of diseases, hearing diagnostics, identifying inflammatory processes, monitoring physiotherapy procedures, conducting surgical operations accompanied by patient cooling, long-term control of the engraftment process of transplanted organs, monitoring treatment of malignant neoplasms by hyperthermia and thermal ablation methods, as well as using synergistic effects in oncology.In the acoustothermometry research method, the internal temperature is measured by receiving and recording

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Section: Literature Review and Problem Statementmentioning

confidence: 82%

Experimental researching of biological objects noninvasive passive acoustothermometry features

Didkovskyi

Naida

Drozdenko

et al. 2020

EEJET

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show abstract

“…It is shown that the calculated ratios of the first method are simpler for the analysis and calculation of amplitude-frequency piezoelectric emitters for therapeutic devices. The calculated ratios of the second method are simpler when analyzing and calculating piezoelectric receivers, which may be relevant in such areas of application as passive acoustic diagnostic methods: measurement of the deep temperature of the human body with its acoustic thermal radiation [8]. In the case of PTs operating in the combined mode, as in an ultrasonic diagnostic echoscope, the electromechanical quadrupole method can be recommended.…”

Section: Discussionmentioning

confidence: 99%

Methods for Calculating the Transfer Functions of Broadband Plate Piezoelectric Transducers with Transition Layers

Naida¹,

Zheliaskova²,

Naida³

et al. 2021

J. Nano- Electron. Phys.

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The work considers broadband ultrasonic piezoelectric transducers for medical diagnostic echoscopes, ultrasonic therapeutic devices, which are widely used for the diagnosis and treatment of various diseases in medicine. Such piezoelectric transducers provide a bandwidth that covers almost the entire operating range of single-frequency electroacoustic transducers, specifically 1.4 to 18 MHz for diagnostic devices and 1 to 3 MHz for therapeutic devices. The use of broadband piezoelectric transducers significantly expands the capabilities of ultrasound devices. With the help of a 4.5-18 MHz band scanner, it becomes possible to obtain an image of the spinal canal, the possibility of which has not even been discussed before. Therapeutic devices become more effective, and at the same time, their safety increases by eliminating the possibility of the formation of standing waves in the broadband mode. In this work, a method was chosen for expanding the band of a piezoelectric transducer using acoustic layers and electrical circuits, and the features of their medical application were taken into account: the load of piezoelectric transducers on a medium with low impedance and high attenuation -biological tissue -and operation in the echo mode. In all of the above applications of broadband piezoelectric transducers, the transfer function parameter becomes important, that is, the ratio of the input action to the output one. The purpose of the work is to obtain expressions for the transfer functions of wideband piezoelectric transducers of various designs with one or two transition layers. The calculation of the piezoelectric transducer transfer functions was carried out by two methods: the wave equation method, which is characterized by the need to solve a system consisting of a large number of equations even with a small number of transition layers, and on the basis of A-matrices of the regular line segment. It is shown that these two methods give the same calculated ratios, but the second method is more convenient for calculations.

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“…In [40], the authors reconstruct the temperature profile of forearm and plasticine object using broadband acoustic thermometers. The average error is about 0.5K in plasticine object.…”

Section: ∝ 2 (15)mentioning

confidence: 99%

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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Passive estimation of internal temperatures making use of broadband ultrasound radiated by the body

Cited by 15 publications

References 35 publications

Experimental researching of biological objects noninvasive passive acoustothermometry features

Experimental researching of biological objects noninvasive passive acoustothermometry features

Methods for Calculating the Transfer Functions of Broadband Plate Piezoelectric Transducers with Transition Layers

A Review of Ultrasound Thermometry Techniques

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