Pub Date : 2022-01-01DOI: 10.1109/OJUFFC.2023.3261160
{"title":"2022 Index IEEE Open Journal of Ultrasonics, Ferroelectrics, and Frequency Control Vol. 2","authors":"","doi":"10.1109/OJUFFC.2023.3261160","DOIUrl":"https://doi.org/10.1109/OJUFFC.2023.3261160","url":null,"abstract":"","PeriodicalId":73301,"journal":{"name":"IEEE open journal of ultrasonics, ferroelectrics, and frequency control","volume":"2 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/9292640/9674185/10083267.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49907683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sparse spiral phased arrays are advantageous for many emerging air-coupled ultrasonic applications, since grating lobes are prevented without being constrained to the half-wavelength element spacing requirement of well-known dense arrays. As a result, the limitation on the maximum transducer diameter is omitted and the aperture can be enlarged for improving the beamforming precision without requiring the number of transducers to be increased. We demonstrate that in-air imaging, in particular, benefits from these features, enabling large-volume, unambiguous and high-resolution image formation. Therefore, we created an air-coupled ultrasonic phased array based on the Fermat spiral, capable of transmit, receive and pulse-echo operation, as well as 3D imaging. The array consists of 64 piezoelectric 40-kHz transducers (Murata MA40S4S), spanning an aperture of 200mm. First, we provide an application-independent numerical and experimental characterization of the conventional beamforming performance of all operation modes for varying focal directions and distances. Second, we examine the resulting imaging capabilities using the single line transmission technique. Apart from the high maximum sound pressure level of 152 dB, we validate that unambiguous high-accuracy 3D imaging is possible in a wide field of view (±80°), long range (20cm to 5m+) and with a high angular resolution of up to 2.3°. Additionally, we demonstrate that object shapes and patterns of multiple reflectors are recognizable in the images generated using a simple threshold for separation. In total, the imaging capabilities achieved are promising to open up further possibilities, e.g. robust object classification in harsh environments based on ultrasonic images.
{"title":"Air-Coupled Ultrasonic Spiral Phased Array for High-Precision Beamforming and Imaging","authors":"Gianni Allevato;Matthias Rutsch;Jan Hinrichs;Christoph Haugwitz;Raphael Müller;Marius Pesavento;Mario Kupnik","doi":"10.1109/OJUFFC.2022.3142710","DOIUrl":"https://doi.org/10.1109/OJUFFC.2022.3142710","url":null,"abstract":"Sparse spiral phased arrays are advantageous for many emerging air-coupled ultrasonic applications, since grating lobes are prevented without being constrained to the half-wavelength element spacing requirement of well-known dense arrays. As a result, the limitation on the maximum transducer diameter is omitted and the aperture can be enlarged for improving the beamforming precision without requiring the number of transducers to be increased. We demonstrate that in-air imaging, in particular, benefits from these features, enabling large-volume, unambiguous and high-resolution image formation. Therefore, we created an air-coupled ultrasonic phased array based on the Fermat spiral, capable of transmit, receive and pulse-echo operation, as well as 3D imaging. The array consists of 64 piezoelectric 40-kHz transducers (Murata MA40S4S), spanning an aperture of 200mm. First, we provide an application-independent numerical and experimental characterization of the conventional beamforming performance of all operation modes for varying focal directions and distances. Second, we examine the resulting imaging capabilities using the single line transmission technique. Apart from the high maximum sound pressure level of 152 dB, we validate that unambiguous high-accuracy 3D imaging is possible in a wide field of view (±80°), long range (20cm to 5m+) and with a high angular resolution of up to 2.3°. Additionally, we demonstrate that object shapes and patterns of multiple reflectors are recognizable in the images generated using a simple threshold for separation. In total, the imaging capabilities achieved are promising to open up further possibilities, e.g. robust object classification in harsh environments based on ultrasonic images.","PeriodicalId":73301,"journal":{"name":"IEEE open journal of ultrasonics, ferroelectrics, and frequency control","volume":"2 ","pages":"40-54"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/9292640/9674185/09678369.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49907932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1109/OJUFFC.2023.3257501
{"title":"IEEE OPEN JOURNAL OF ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL","authors":"","doi":"10.1109/OJUFFC.2023.3257501","DOIUrl":"https://doi.org/10.1109/OJUFFC.2023.3257501","url":null,"abstract":"","PeriodicalId":73301,"journal":{"name":"IEEE open journal of ultrasonics, ferroelectrics, and frequency control","volume":"2 ","pages":"C2-C2"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/9292640/9674185/10083223.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49907682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A free piezoelectric disc with uniform polarization shows multiple radial modes of vibration that occur in the low-frequency range. The strength of these radial mode resonances is fixed and reduces with increasing frequency or mode number. In this article, we show that piezoelectric wafers can be designed with appropriate non-uniform polarization profiles to selectively excite single or any combination of multiple radial modes with an additional capability of altering the relative strengths of electromechanical resonances that is not possible with uniform polarization. We first discuss the theory behind our approach based on a Fourier-Bessel expansion technique. Then, we present several examples demonstrating the capability of tuning the relative strengths of electromechanical resonances in a piezoelectric disc using axisymmetric, non-uniform polarization profiles. The methodology presented in this article finds application in the design of single element transducers with multi-frequency operation, frequency-tuned sensors/receivers, collimated beam sources for underwater acoustics, and other non-traditional applications such as information storage.
{"title":"Tuning the Relative Strengths of Electromechanical Resonances Using Non-Uniform Polarization of Piezoelectric Wafers","authors":"Anurup Guha;Cristian Pantea;Vamshi Krishna Chillara","doi":"10.1109/OJUFFC.2021.3134935","DOIUrl":"https://doi.org/10.1109/OJUFFC.2021.3134935","url":null,"abstract":"A free piezoelectric disc with uniform polarization shows multiple radial modes of vibration that occur in the low-frequency range. The strength of these radial mode resonances is fixed and reduces with increasing frequency or mode number. In this article, we show that piezoelectric wafers can be designed with appropriate non-uniform polarization profiles to selectively excite single or any combination of multiple radial modes with an additional capability of altering the relative strengths of electromechanical resonances that is not possible with uniform polarization. We first discuss the theory behind our approach based on a Fourier-Bessel expansion technique. Then, we present several examples demonstrating the capability of tuning the relative strengths of electromechanical resonances in a piezoelectric disc using axisymmetric, non-uniform polarization profiles. The methodology presented in this article finds application in the design of single element transducers with multi-frequency operation, frequency-tuned sensors/receivers, collimated beam sources for underwater acoustics, and other non-traditional applications such as information storage.","PeriodicalId":73301,"journal":{"name":"IEEE open journal of ultrasonics, ferroelectrics, and frequency control","volume":"2 ","pages":"17-29"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/9292640/9674185/09646958.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49907686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1109/OJUFFC.2022.3172665
Khoirom Johnson Singh;Nitanshu Chauhan;Anand Bulusu;Sudeb Dasgupta
A novel approach to overcome Boltzmann’s tyranny is to exploit the negative capacitance (NC) effect found naturally in many ferroelectric (FE) materials. We apply a set of coupled equations based on electrostatics, Kirchoff’s law, and a well-calibrated Ginzburg-Landau-Khalatnikov technology computer-aided design (TCAD) model to simulate an organic FE poly(vinylidene fluoride- co -trifluoroethylene) [P(VDF-TrFE)]-based resistor metal-FE-metal ($R$ -MFM) series circuit and a Landau transistor (LT) exhibiting sub-60 mV/decade subthreshold swing (SS). TCAD simulation parameters for P(VDF-TrFE) are derived from the reported experimental polarization versus voltage characteristics using Landau theory. Unlike oxide FEs, the P(VDF-TrFE)-based $R$ -MFM series circuit can exploit the NC effect at a lower supply voltage ($V_{G}$ ) of ±0.5 V with little energy dissipation of ~2.7 fJ through $R$ . Our simulation results show an 84.89% reduction in the P(VDF-TrFE)’s coercivity concerning the oxide FE. We show that the underlying mechanism of the NC effect is directly related to FE polarization (FE-$P$ ) switching. The NC effect occurs only when the FE-$P$ is in the negative curvature of the P(VDF-TrFE)’s free energy landscape. The NC effect is explored in terms of $V_{G}$ , FE thickness, domain variations, $R$ , and dipole switching resistivity. The influence of $R$ variation on the NC time ($delta t$ ) is investigated at 100 kHz. We can observe that $delta t$ and $R$ have a linear relationship. As $R$ approaches zero, we determined that the inherent FE-$P$ switching speed exclusively restricts the NC effect. Finally, a 32 nm P(VDF-TrFE) LT provides a minimal SS of 23.39 mV/decade, 74.92% less than its CMOS counterpart. Therefore, the proposed organic MFM stack could open the path for developing beyond CMOS transistor technology operating in sub-60 mV/decade.
{"title":"Physical Cause and Impact of Negative Capacitance Effect in Ferroelectric P(VDF-TrFE) Gate Stack and Its Application to Landau Transistor","authors":"Khoirom Johnson Singh;Nitanshu Chauhan;Anand Bulusu;Sudeb Dasgupta","doi":"10.1109/OJUFFC.2022.3172665","DOIUrl":"https://doi.org/10.1109/OJUFFC.2022.3172665","url":null,"abstract":"A novel approach to overcome Boltzmann’s tyranny is to exploit the negative capacitance (NC) effect found naturally in many ferroelectric (FE) materials. We apply a set of coupled equations based on electrostatics, Kirchoff’s law, and a well-calibrated Ginzburg-Landau-Khalatnikov technology computer-aided design (TCAD) model to simulate an organic FE poly(vinylidene fluoride- <italic>co</italic> -trifluoroethylene) [P(VDF-TrFE)]-based resistor metal-FE-metal (<inline-formula> <tex-math notation=\"LaTeX\">$R$ </tex-math></inline-formula>-MFM) series circuit and a Landau transistor (LT) exhibiting sub-60 mV/decade subthreshold swing (<italic>SS</italic>). TCAD simulation parameters for P(VDF-TrFE) are derived from the reported experimental polarization versus voltage characteristics using Landau theory. Unlike oxide FEs, the P(VDF-TrFE)-based <inline-formula> <tex-math notation=\"LaTeX\">$R$ </tex-math></inline-formula>-MFM series circuit can exploit the NC effect at a lower supply voltage (<inline-formula> <tex-math notation=\"LaTeX\">$V_{G}$ </tex-math></inline-formula>) of ±0.5 V with little energy dissipation of ~2.7 fJ through <inline-formula> <tex-math notation=\"LaTeX\">$R$ </tex-math></inline-formula>. Our simulation results show an 84.89% reduction in the P(VDF-TrFE)’s coercivity concerning the oxide FE. We show that the underlying mechanism of the NC effect is directly related to FE polarization (FE-<inline-formula> <tex-math notation=\"LaTeX\">$P$ </tex-math></inline-formula>) switching. The NC effect occurs only when the FE-<inline-formula> <tex-math notation=\"LaTeX\">$P$ </tex-math></inline-formula> is in the negative curvature of the P(VDF-TrFE)’s free energy landscape. The NC effect is explored in terms of <inline-formula> <tex-math notation=\"LaTeX\">$V_{G}$ </tex-math></inline-formula>, FE thickness, domain variations, <inline-formula> <tex-math notation=\"LaTeX\">$R$ </tex-math></inline-formula>, and dipole switching resistivity. The influence of <inline-formula> <tex-math notation=\"LaTeX\">$R$ </tex-math></inline-formula> variation on the NC time (<inline-formula> <tex-math notation=\"LaTeX\">$delta t$ </tex-math></inline-formula>) is investigated at 100 kHz. We can observe that <inline-formula> <tex-math notation=\"LaTeX\">$delta t$ </tex-math></inline-formula> and <inline-formula> <tex-math notation=\"LaTeX\">$R$ </tex-math></inline-formula> have a linear relationship. As <inline-formula> <tex-math notation=\"LaTeX\">$R$ </tex-math></inline-formula> approaches zero, we determined that the inherent FE-<inline-formula> <tex-math notation=\"LaTeX\">$P$ </tex-math></inline-formula> switching speed exclusively restricts the NC effect. Finally, a 32 nm P(VDF-TrFE) LT provides a minimal <italic>SS</italic> of 23.39 mV/decade, 74.92% less than its CMOS counterpart. Therefore, the proposed organic MFM stack could open the path for developing beyond CMOS transistor technology operating in sub-60 mV/decade.","PeriodicalId":73301,"journal":{"name":"IEEE open journal of ultrasonics, ferroelectrics, and frequency control","volume":"2 ","pages":"55-64"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/9292640/9674185/09768803.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49907933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-22DOI: 10.1109/OJUFFC.2021.3130021
Rashid Al Mukaddim;Nirvedh H. Meshram;Ashley M. Weichmann;Carol C. Mitchell;Tomy Varghese
Cardiac strain imaging (CSI) plays a critical role in the detection of myocardial motion abnormalities. Displacement estimation is an important processing step to ensure the accuracy and precision of derived strain tensors. In this paper, we propose and implement Spatiotemporal Bayesian regularization (STBR) algorithms for two-dimensional (2-D) normalized cross-correlation (NCC) based multi-level block matching along with incorporation into a Lagrangian cardiac strain estimation framework. Assuming smooth temporal variation over a short span of time, the proposed STBR algorithm performs displacement estimation using at least four consecutive ultrasound radio-frequency (RF) frames by iteratively regularizing 2-D NCC matrices using information from a local spatiotemporal neighborhood in a Bayesian sense. Two STBR schemes are proposed to construct Bayesian likelihood functions termed as Spatial then Temporal Bayesian (STBR-1) and simultaneous Spatiotemporal Bayesian (STBR-2). Radial and longitudinal strain estimated from a finite-element-analysis (FEA) model of realistic canine myocardial deformation were utilized to quantify strain bias, normalized strain error and total temporal relative error (TTR). Statistical analysis with one-way analysis of variance (ANOVA) showed that all Bayesian regularization methods significantly outperform NCC with lower bias and errors ( ${p} < $ 0.001 ). However, there was no significant difference among Bayesian methods. For example, mean longitudinal TTR for NCC, SBR, STBR-1 and STBR-2 were 25.41%, 9.27%, 10.38% and 10.13% respectively An in vivo feasibility study using RF data from ten healthy mice hearts were used to compare the elastographic signal-to-noise ratio ( ${mathrm {SNR}}_{mathrm {e}}$ ) calculated using stochastic analysis. STBR-2 had the highest expected SNR e both for radial and longitudinal strain. The mean expected SNR e values for accumulated radial strain for NCC, SBR, STBR-1 and STBR-2 were 5.03, 9.43, 9.42 and 10.58, respectively. Overall results suggest that STBR improves CSI in vivo .
{"title":"Spatiotemporal Bayesian Regularization for Cardiac Strain Imaging: Simulation and In Vivo Results","authors":"Rashid Al Mukaddim;Nirvedh H. Meshram;Ashley M. Weichmann;Carol C. Mitchell;Tomy Varghese","doi":"10.1109/OJUFFC.2021.3130021","DOIUrl":"https://doi.org/10.1109/OJUFFC.2021.3130021","url":null,"abstract":"Cardiac strain imaging (CSI) plays a critical role in the detection of myocardial motion abnormalities. Displacement estimation is an important processing step to ensure the accuracy and precision of derived strain tensors. In this paper, we propose and implement Spatiotemporal Bayesian regularization (STBR) algorithms for two-dimensional (2-D) normalized cross-correlation (NCC) based multi-level block matching along with incorporation into a Lagrangian cardiac strain estimation framework. Assuming smooth temporal variation over a short span of time, the proposed STBR algorithm performs displacement estimation using at least four consecutive ultrasound radio-frequency (RF) frames by iteratively regularizing 2-D NCC matrices using information from a local spatiotemporal neighborhood in a Bayesian sense. Two STBR schemes are proposed to construct Bayesian likelihood functions termed as Spatial then Temporal Bayesian (STBR-1) and simultaneous Spatiotemporal Bayesian (STBR-2). Radial and longitudinal strain estimated from a finite-element-analysis (FEA) model of realistic canine myocardial deformation were utilized to quantify strain bias, normalized strain error and total temporal relative error (TTR). Statistical analysis with one-way analysis of variance (ANOVA) showed that all Bayesian regularization methods significantly outperform NCC with lower bias and errors (\u0000<inline-formula> <tex-math>${p} < $ </tex-math></inline-formula>\u0000 \u0000<italic>0.001</i>\u0000). However, there was no significant difference among Bayesian methods. For example, mean longitudinal TTR for NCC, SBR, STBR-1 and STBR-2 were 25.41%, 9.27%, 10.38% and 10.13% respectively An \u0000<italic>in vivo</i>\u0000 feasibility study using RF data from ten healthy mice hearts were used to compare the elastographic signal-to-noise ratio (\u0000<inline-formula> <tex-math>${mathrm {SNR}}_{mathrm {e}}$ </tex-math></inline-formula>\u0000) calculated using stochastic analysis. STBR-2 had the highest expected SNR\u0000<sub>e</sub>\u0000 both for radial and longitudinal strain. The mean expected SNR\u0000<sub>e</sub>\u0000 values for accumulated radial strain for NCC, SBR, STBR-1 and STBR-2 were 5.03, 9.43, 9.42 and 10.58, respectively. Overall results suggest that STBR improves CSI \u0000<italic>in vivo</i>\u0000.","PeriodicalId":73301,"journal":{"name":"IEEE open journal of ultrasonics, ferroelectrics, and frequency control","volume":"1 ","pages":"21-36"},"PeriodicalIF":0.0,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/9292640/9377491/09623563.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49908122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-03DOI: 10.1109/OJUFFC.2021.3085539
Hermes A. S. Kamimura;Niloufar Saharkhiz;Stephen A. Lee;Elisa E. Konofagou
Ultrasound attenuation through soft tissues can produce an acoustic radiation force (ARF) and heating. The ARF-induced displacements and temperature evaluations can reveal tissue properties and provide insights into focused ultrasound (FUS) bio-effects. In this study, we describe an interleaving pulse sequence tested in a tissue-mimicking phantom that alternates FUS and plane-wave imaging pulses at a 1 kHz frame rate. The FUS is amplitude modulated, enabling the simultaneous evaluation of tissue-mimicking phantom displacement using harmonic motion imaging (HMI) and temperature rise using thermal strain imaging (TSI). The parameters were varied with a spatial peak temporal average acoustic intensity ( $I_{spta}$ ) ranging from 1.5 to 311 W.cm −2 , mechanical index (MI) from 0.43 to 4.0, and total energy ( $E$ ) from 0.24 to 83 J.cm −2 . The HMI and TSI processing could estimate displacement and temperature independently for temperatures below 1.80°C and displacements up to $sim -117 mu {text{m}}$ ( $I_{spta} < 311 text{ W.cm}^{-2}$ , $MI < 4.0$ , and $E < 83 text{ J.cm}^{-2}$ ) indicated by a steady-state tissue-mimicking phantom displacement throughout the sonication and a comparable temperature estimation with simulations in the absence of tissue-mimicking phantom motion. The TSI estimations presented a mean error of ±0.03°C versus thermocouple estimations with a mean error of ±0.24°C. The results presented herein indicate that HMI can operate at diagnostictemperature levels (i.e., <1°C)> $720 text{ mW.cm}^{-2} < I_{spta} < 207 text{ W.cm}^{-2}$ ). In addition, the combined HMI and TSI can potentially be used for simultaneous evaluation of safety during tissue elasticity imaging as well as FUS mechanism involved in novel ultrasound applications such as ultrasound neuromodulation and tumor ablation.
{"title":"Synchronous Temperature Variation Monitoring During Ultrasound Imaging and/or Treatment Pulse Application: A Phantom Study","authors":"Hermes A. S. Kamimura;Niloufar Saharkhiz;Stephen A. Lee;Elisa E. Konofagou","doi":"10.1109/OJUFFC.2021.3085539","DOIUrl":"10.1109/OJUFFC.2021.3085539","url":null,"abstract":"Ultrasound attenuation through soft tissues can produce an acoustic radiation force (ARF) and heating. The ARF-induced displacements and temperature evaluations can reveal tissue properties and provide insights into focused ultrasound (FUS) bio-effects. In this study, we describe an interleaving pulse sequence tested in a tissue-mimicking phantom that alternates FUS and plane-wave imaging pulses at a 1 kHz frame rate. The FUS is amplitude modulated, enabling the simultaneous evaluation of tissue-mimicking phantom displacement using harmonic motion imaging (HMI) and temperature rise using thermal strain imaging (TSI). The parameters were varied with a spatial peak temporal average acoustic intensity (\u0000<inline-formula> <tex-math>$I_{spta}$ </tex-math></inline-formula>\u0000) ranging from 1.5 to 311 W.cm\u0000<sup>−2</sup>\u0000, mechanical index (MI) from 0.43 to 4.0, and total energy (\u0000<inline-formula> <tex-math>$E$ </tex-math></inline-formula>\u0000) from 0.24 to 83 J.cm\u0000<sup>−2</sup>\u0000. The HMI and TSI processing could estimate displacement and temperature independently for temperatures below 1.80°C and displacements up to \u0000<inline-formula> <tex-math>$sim -117 mu {text{m}}$ </tex-math></inline-formula>\u0000 (\u0000<inline-formula> <tex-math>$I_{spta} < 311 text{ W.cm}^{-2}$ </tex-math></inline-formula>\u0000, \u0000<inline-formula> <tex-math>$MI < 4.0$ </tex-math></inline-formula>\u0000, and \u0000<inline-formula> <tex-math>$E < 83 text{ J.cm}^{-2}$ </tex-math></inline-formula>\u0000) indicated by a steady-state tissue-mimicking phantom displacement throughout the sonication and a comparable temperature estimation with simulations in the absence of tissue-mimicking phantom motion. The TSI estimations presented a mean error of ±0.03°C versus thermocouple estimations with a mean error of ±0.24°C. The results presented herein indicate that HMI can operate at diagnostictemperature levels (i.e., <1°C)> <tex-math>$720 text{ mW.cm}^{-2} < I_{spta} < 207 text{ W.cm}^{-2}$ </tex-math></inline-formula>\u0000). In addition, the combined HMI and TSI can potentially be used for simultaneous evaluation of safety during tissue elasticity imaging as well as FUS mechanism involved in novel ultrasound applications such as ultrasound neuromodulation and tumor ablation.","PeriodicalId":73301,"journal":{"name":"IEEE open journal of ultrasonics, ferroelectrics, and frequency control","volume":"1 ","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2021-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/OJUFFC.2021.3085539","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9298198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1109/OJUFFC.2021.3120234
Andreas Hefele;Christoph Strobl;Erik Baigar;Georg Kurzmaier;Alexander Reiner;Andreas L. Hörner;Achim Wixforth
A fluid-independent ultrasonic approach for flow determination in microchannels in the harsh environment of an ultra high pressure liquid chromatography (UHPLC) system is presented. Ultrasonic waves in the fluid are excited by separate media surface acoustic waves (SAW) of Rayleigh-Wave type. The LiNbO3 SAW chip being equipped with interdigitated transducers for SAW excitation also marks the bottom of the fluid channel and thus allows for very effective SAW coupling to the fluid. The channel ceiling acts as an acoustical mirror for longitudinal ultrasonic waves propagating through the fluid. To deduce the fluid flow from the ultrasonic transmission after reflection, we employ a combination of time differential phase and time of flight measurements with a two port vector network analyzer. To verify and assign our experimental results, we use an adapted time explicit finite element method. In the simulation, both the piezoelectric single crystal and the fluid are included and we solve the linear Navier-Stokes equation to evaluate the background flow. By changing the ultrasonic propagation direction, we are able to deduce the fluid volume flow over time with very high accuracy, independent of the actual liquid in the channel.
{"title":"Fluid Independent Flow Determination by Surface Acoustic Wave Driven Ultrasonic Techniques","authors":"Andreas Hefele;Christoph Strobl;Erik Baigar;Georg Kurzmaier;Alexander Reiner;Andreas L. Hörner;Achim Wixforth","doi":"10.1109/OJUFFC.2021.3120234","DOIUrl":"https://doi.org/10.1109/OJUFFC.2021.3120234","url":null,"abstract":"A fluid-independent ultrasonic approach for flow determination in microchannels in the harsh environment of an ultra high pressure liquid chromatography (UHPLC) system is presented. Ultrasonic waves in the fluid are excited by separate media surface acoustic waves (SAW) of Rayleigh-Wave type. The LiNbO3 SAW chip being equipped with interdigitated transducers for SAW excitation also marks the bottom of the fluid channel and thus allows for very effective SAW coupling to the fluid. The channel ceiling acts as an acoustical mirror for longitudinal ultrasonic waves propagating through the fluid. To deduce the fluid flow from the ultrasonic transmission after reflection, we employ a combination of time differential phase and time of flight measurements with a two port vector network analyzer. To verify and assign our experimental results, we use an adapted time explicit finite element method. In the simulation, both the piezoelectric single crystal and the fluid are included and we solve the linear Navier-Stokes equation to evaluate the background flow. By changing the ultrasonic propagation direction, we are able to deduce the fluid volume flow over time with very high accuracy, independent of the actual liquid in the channel.","PeriodicalId":73301,"journal":{"name":"IEEE open journal of ultrasonics, ferroelectrics, and frequency control","volume":"1 ","pages":"11-20"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/9292640/9377491/09576509.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49907714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1109/OJUFFC.2022.3157415
{"title":"IEEE OPEN JOURNAL OF ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL","authors":"","doi":"10.1109/OJUFFC.2022.3157415","DOIUrl":"https://doi.org/10.1109/OJUFFC.2022.3157415","url":null,"abstract":"","PeriodicalId":73301,"journal":{"name":"IEEE open journal of ultrasonics, ferroelectrics, and frequency control","volume":"1 ","pages":"C2-C2"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/9292640/9377491/09735133.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49907483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：