Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8925658
Chao Li, Q. Guo, Hanyin Cui, Rushan Shen, Xiaodong Peng, Xuchen Shen, Yaqin Hou, Qinghua Gao, Jing Wang, Chongxing Liu
The variation of sound speeds of air and nitrogen gas at temperatures from 15 to −80 °C, and at gas pressures from 105 to 150 Pa have been measured in a KM2G space simulator. The objective is to provide the primary acoustic parameters to set up a proper multi-layered near-space atmosphere model, so that to simulate propagation paths of acoustic waves. From experimental data, sound speeds of both air and nitrogen gas decrease with the decreasing temperature from 15 to −80 °C and with the decreasing pressure from 105 to about 5000 Pa. However, sound speeds in the 15°C rare air and nitrogen gas slightly increase with the dropping pressure below 5000 Pa, and this trend becomes more obviously when the temperature is low. This dispersion characteristic of acoustic wave in the near-space atmosphere should be considered during simulation of wave propagation.
{"title":"Wave Propagation in the Multilayered Low-pressure Near-space Atmosphere","authors":"Chao Li, Q. Guo, Hanyin Cui, Rushan Shen, Xiaodong Peng, Xuchen Shen, Yaqin Hou, Qinghua Gao, Jing Wang, Chongxing Liu","doi":"10.1109/ULTSYM.2019.8925658","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925658","url":null,"abstract":"The variation of sound speeds of air and nitrogen gas at temperatures from 15 to −80 °C, and at gas pressures from 105 to 150 Pa have been measured in a KM2G space simulator. The objective is to provide the primary acoustic parameters to set up a proper multi-layered near-space atmosphere model, so that to simulate propagation paths of acoustic waves. From experimental data, sound speeds of both air and nitrogen gas decrease with the decreasing temperature from 15 to −80 °C and with the decreasing pressure from 105 to about 5000 Pa. However, sound speeds in the 15°C rare air and nitrogen gas slightly increase with the dropping pressure below 5000 Pa, and this trend becomes more obviously when the temperature is low. This dispersion characteristic of acoustic wave in the near-space atmosphere should be considered during simulation of wave propagation.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"87 7","pages":"1674-1677"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91417625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8925935
Kathryn A. Ozgun, B. Byram
Eigen-based clutter filtering of Doppler data has demonstrated greater clutter rejection performance than traditional filtering in a number of studies. However, practical translation of these eigen-based techniques to channel domain filtering applications is limited by their high computational burden. To enable efficient eigen-based filtering of channel data, we propose a domain-adaptive filtering framework. This technique involves using a basis set generated from RF data to filter delayed channel data. Preliminary findings suggest that this technique retains superior clutter rejection performance in comparison to conventional techniques.
{"title":"A General Framework for Channel Domain SVD Clutter Filtering","authors":"Kathryn A. Ozgun, B. Byram","doi":"10.1109/ULTSYM.2019.8925935","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925935","url":null,"abstract":"Eigen-based clutter filtering of Doppler data has demonstrated greater clutter rejection performance than traditional filtering in a number of studies. However, practical translation of these eigen-based techniques to channel domain filtering applications is limited by their high computational burden. To enable efficient eigen-based filtering of channel data, we propose a domain-adaptive filtering framework. This technique involves using a basis set generated from RF data to filter delayed channel data. Preliminary findings suggest that this technique retains superior clutter rejection performance in comparison to conventional techniques.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"2014 1","pages":"2246-2248"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83163209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8925938
Marcel Krenkel, S. Koch, M. Kupnik
This paper derives an analytical model of the electrostatic transduction of a capacitive micromachined ultrasonic transducer (CMUT) with mechanically coupled plate actuators. The mass of the coupling geometry significantly affects the dynamic deflection shape of the plate actuators. As the electrostatic transduction of a CMUT depends on the distance between both electrodes of these capacitive systems, the static and dynamic deflection shapes are taken into account for the small signal electrostatic behavior. The analysis of the electrostatic lumped elements, varying with the bias voltage, reveals a dependence on the deflection shape. A comparison with finite element simulations shows good agreement with the analytical model.
{"title":"CMUT with mechanically coupled plate actuators -Linearized electrostatic modeling","authors":"Marcel Krenkel, S. Koch, M. Kupnik","doi":"10.1109/ULTSYM.2019.8925938","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925938","url":null,"abstract":"This paper derives an analytical model of the electrostatic transduction of a capacitive micromachined ultrasonic transducer (CMUT) with mechanically coupled plate actuators. The mass of the coupling geometry significantly affects the dynamic deflection shape of the plate actuators. As the electrostatic transduction of a CMUT depends on the distance between both electrodes of these capacitive systems, the static and dynamic deflection shapes are taken into account for the small signal electrostatic behavior. The analysis of the electrostatic lumped elements, varying with the bias voltage, reveals a dependence on the deflection shape. A comparison with finite element simulations shows good agreement with the analytical model.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"43 1","pages":"774-777"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80557580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8925626
N. Bush, P. Sontum, J. Bamber, A. Healey, Anant Shah, G. Box, V. Kirkin, S. Kotopoulis, S. Kvåle, A. van Wamel, C. de Lange Davies
Acoustic Cluster Therapy (ACT) employs an intravenously-injected dispersion of clusters of microbubbles and oil microdroplets, in combination with ultrasound directed at the tumor, to enhance the delivery of a co-administered drug. Diagnostic ultrasound activates the clusters, causing the droplets to change phase and become large (> 20 m) bubbles which lodge in the tumor capillaries. Delivery-enhancement is then achieved using a low-frequency (e.g. 300 kHz) ultrasound field also directed at the tumor, which causes the stationary bubbles to pulsate whilst in direct contact with the vascular endothelium. ACT has been shown to significantly increase the efficacy of various chemotherapeutics in a variety of tumor models in mice. Here we demonstrate through preclinical in-vivo experiments that the efficacy of treating human triple negative breast cancer in mice with liposomal doxorubicin (Doxil®) is significantly enhanced by ACT; for example, 63 % of animals achieved complete, stable remission, in the group treated with the drug and ACT versus only 10 % for Doxil® alone (p < 0.02). We also show in the same experiments that the ACT contrast enhancement obtained under ultrasound activation of the ACT clusters, either before or during treatment, holds promise as an imaging biomarker for predicting response.
{"title":"Acoustic Cluster Therapy displays theranostic capability in enhancing the effectiveness of liposomal doxorubicin treatment of human triple negative breast cancer in mice","authors":"N. Bush, P. Sontum, J. Bamber, A. Healey, Anant Shah, G. Box, V. Kirkin, S. Kotopoulis, S. Kvåle, A. van Wamel, C. de Lange Davies","doi":"10.1109/ULTSYM.2019.8925626","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925626","url":null,"abstract":"Acoustic Cluster Therapy (ACT) employs an intravenously-injected dispersion of clusters of microbubbles and oil microdroplets, in combination with ultrasound directed at the tumor, to enhance the delivery of a co-administered drug. Diagnostic ultrasound activates the clusters, causing the droplets to change phase and become large (> 20 m) bubbles which lodge in the tumor capillaries. Delivery-enhancement is then achieved using a low-frequency (e.g. 300 kHz) ultrasound field also directed at the tumor, which causes the stationary bubbles to pulsate whilst in direct contact with the vascular endothelium. ACT has been shown to significantly increase the efficacy of various chemotherapeutics in a variety of tumor models in mice. Here we demonstrate through preclinical in-vivo experiments that the efficacy of treating human triple negative breast cancer in mice with liposomal doxorubicin (Doxil®) is significantly enhanced by ACT; for example, 63 % of animals achieved complete, stable remission, in the group treated with the drug and ACT versus only 10 % for Doxil® alone (p < 0.02). We also show in the same experiments that the ACT contrast enhancement obtained under ultrasound activation of the ACT clusters, either before or during treatment, holds promise as an imaging biomarker for predicting response.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"18 1","pages":"224-226"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83685336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8925911
Derek Y. Chan, D. Morris, M. Palmeri, K. Nightingale
Ultrasound elasticity imaging in soft tissue with acoustic radiation force requires extracting displacement information, typically on the order of several microns, from raw data. In this work, we implement a fully convolutional neural network for ultrasound displacement estimation. We present a novel method for generating ultrasound training data, in which virtual displacement volumes are created with a combination of randomly-seeded ellipsoids. Network performance was tested on the virtual displacement volumes as well as an experimental phantom dataset and human in vivo prostate data. In simulated and phantom data, the proposed neural network accurately reconstructed the ARFI displacements, performing similarly to a conventional phase-shift displacement estimation algorithm. Application of the trained network to in vivo prostate data enabled the visualization of the prostatic urethra and peripheral zone.
{"title":"A Fully Convolutional Neural Network for Rapid Displacement Estimation in ARFI Imaging","authors":"Derek Y. Chan, D. Morris, M. Palmeri, K. Nightingale","doi":"10.1109/ULTSYM.2019.8925911","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925911","url":null,"abstract":"Ultrasound elasticity imaging in soft tissue with acoustic radiation force requires extracting displacement information, typically on the order of several microns, from raw data. In this work, we implement a fully convolutional neural network for ultrasound displacement estimation. We present a novel method for generating ultrasound training data, in which virtual displacement volumes are created with a combination of randomly-seeded ellipsoids. Network performance was tested on the virtual displacement volumes as well as an experimental phantom dataset and human in vivo prostate data. In simulated and phantom data, the proposed neural network accurately reconstructed the ARFI displacements, performing similarly to a conventional phase-shift displacement estimation algorithm. Application of the trained network to in vivo prostate data enabled the visualization of the prostatic urethra and peripheral zone.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"61 1","pages":"111-114"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83787067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8926272
R. Weser, A. Darinskii, H. Schmidt
Surface acoustic wave (SAW) based actuators used for active microfluidic applications, most often utilize Rayleigh-type SAW with significant out-of-plane surface displacements. Besides the desired momentum transfer to the liquid in contact with the active surface, an additional, unwanted momentum transfer into the polymer wall of the microfluidic vessel also occurs. The energy dissipation inside the vessel wall decreases actuator efficiency and may result in leakage and degradation of the wall material. Our first investigations show that boundary polarized SAW modes with comparatively small out-of-plane displacement can also be used for microfluidic actuation purposes to overcome this drawback. The boundary polarized mode is capable to pass the vessel wall-substrate interface with minimum of acoustical loss, but needs to be converted finally inside the vessel into a vertical polarized mode in order to ensure the intended acoustofluidic interaction. Such a mode or polarization conversion can be realized by an appropriate scattering structure arranged inside the vessel area.
{"title":"Polarization conversion of surface acoustic waves for enhanced microscale actuation applications","authors":"R. Weser, A. Darinskii, H. Schmidt","doi":"10.1109/ULTSYM.2019.8926272","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8926272","url":null,"abstract":"Surface acoustic wave (SAW) based actuators used for active microfluidic applications, most often utilize Rayleigh-type SAW with significant out-of-plane surface displacements. Besides the desired momentum transfer to the liquid in contact with the active surface, an additional, unwanted momentum transfer into the polymer wall of the microfluidic vessel also occurs. The energy dissipation inside the vessel wall decreases actuator efficiency and may result in leakage and degradation of the wall material. Our first investigations show that boundary polarized SAW modes with comparatively small out-of-plane displacement can also be used for microfluidic actuation purposes to overcome this drawback. The boundary polarized mode is capable to pass the vessel wall-substrate interface with minimum of acoustical loss, but needs to be converted finally inside the vessel into a vertical polarized mode in order to ensure the intended acoustofluidic interaction. Such a mode or polarization conversion can be realized by an appropriate scattering structure arranged inside the vessel area.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"25 1","pages":"683-686"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83798115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8925668
Soo Won Kwon, Won Young Choi, K. Park
In this paper, we present an investigation into an optical ultrasound emission mechanism based on a composite of carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS). The CNTs-PDMS composite was fabricated using a brush touch method with a multi-walled carbon nanotube (MWCNT) solution mixed with CNTs and isopropyl alcohol. To explore the optical ultrasound emission mechanism, three groups of specimens were fabricated. The first group was classified as having Nd:YAG laser spot sizes when using a convex lens. The second group was classified according to the coated thickness of the CNTs. Finally, the third group was classified according to the thickness of the PDMS. The CNTs-PDMS composite was placed in a water tank, and an Nd:YAG laser was irradiated onto the CNTs-PDMS composite to receive ultrasound waves generated using a hydrophone. A comparison of the results revealed that specimens with a small laser spot size, a thick coating of CNTs, and a thin PDMS layer achieved the highest frequency of ultrasound waves.
{"title":"Investigation of Optical Ultrasound Emission Mechanism Based on CNTs-PDMS Composite","authors":"Soo Won Kwon, Won Young Choi, K. Park","doi":"10.1109/ULTSYM.2019.8925668","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925668","url":null,"abstract":"In this paper, we present an investigation into an optical ultrasound emission mechanism based on a composite of carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS). The CNTs-PDMS composite was fabricated using a brush touch method with a multi-walled carbon nanotube (MWCNT) solution mixed with CNTs and isopropyl alcohol. To explore the optical ultrasound emission mechanism, three groups of specimens were fabricated. The first group was classified as having Nd:YAG laser spot sizes when using a convex lens. The second group was classified according to the coated thickness of the CNTs. Finally, the third group was classified according to the thickness of the PDMS. The CNTs-PDMS composite was placed in a water tank, and an Nd:YAG laser was irradiated onto the CNTs-PDMS composite to receive ultrasound waves generated using a hydrophone. A comparison of the results revealed that specimens with a small laser spot size, a thick coating of CNTs, and a thin PDMS layer achieved the highest frequency of ultrasound waves.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"24 1","pages":"2519-2522"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83203967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8925754
V. Barrère, E. Franceschini, D. Melodelima
High Intensity Ultrasound (HIU) is of proven value in the treatment of many medical disorders by using US energy without incisions or radiation. The development of an effective method for guiding HIU therapies remains necessary. Changes in spectral-based Quantitative UltraSound (QUS) parameters have been correlated with the temperature changes during HIU exposure (Ghoshal et al. IEEE UFFC 2016). The aim of this study is to quantify the changes in QUS parameters due to temperature elevation after HIU exposure of ex vivo bovine livers. The QUS experiments are conducted in high frequencies (12-38 MHz) to provide insight into the specific changes in liver tissues that cause the changes of backscatter properties for fixed temperature ranging from 37°C up to 80°C after HIU exposure.Samples of porcine livers are exposed to HIU using a plane 3 MHz transducer with aperture diameter of 4 cm. Samples were heated up to 37, 50, 60, 65, 70, 75, 80°C. After reaching the desired temperature, the sample is cut in half at the center of the lesion. US backscatter signals were recorded from the cut samples by using the Visualsonics Vevo 770 imaging system with the RMV710 probe of center frequency 25 MHz. The backscatter coefficients (BSCs) were estimated using the reference phantom technique and the attenuation coefficients were determined using a standard substitution method.Structural scatterer properties were estimated by fitting the measured BSCs with the spherical Gaussian model (SGM) or with the Structure Factor Model (SFM) to estimate the effective scatterer diameter (ESD) and acoustic concentration (EAC). The QUS parameters estimated by the sparse SGM and the concentrated SFM differ strongly from each other for HIU treated samples and suggests that the treated livers can be considered as concentrated media. Results showed that both integrated BSC and ESD estimated by the SFM increased as a function of temperature.
{"title":"Characterization of High Intensity Ultrasound Exposures by Quantitative Ultrasound","authors":"V. Barrère, E. Franceschini, D. Melodelima","doi":"10.1109/ULTSYM.2019.8925754","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925754","url":null,"abstract":"High Intensity Ultrasound (HIU) is of proven value in the treatment of many medical disorders by using US energy without incisions or radiation. The development of an effective method for guiding HIU therapies remains necessary. Changes in spectral-based Quantitative UltraSound (QUS) parameters have been correlated with the temperature changes during HIU exposure (Ghoshal et al. IEEE UFFC 2016). The aim of this study is to quantify the changes in QUS parameters due to temperature elevation after HIU exposure of ex vivo bovine livers. The QUS experiments are conducted in high frequencies (12-38 MHz) to provide insight into the specific changes in liver tissues that cause the changes of backscatter properties for fixed temperature ranging from 37°C up to 80°C after HIU exposure.Samples of porcine livers are exposed to HIU using a plane 3 MHz transducer with aperture diameter of 4 cm. Samples were heated up to 37, 50, 60, 65, 70, 75, 80°C. After reaching the desired temperature, the sample is cut in half at the center of the lesion. US backscatter signals were recorded from the cut samples by using the Visualsonics Vevo 770 imaging system with the RMV710 probe of center frequency 25 MHz. The backscatter coefficients (BSCs) were estimated using the reference phantom technique and the attenuation coefficients were determined using a standard substitution method.Structural scatterer properties were estimated by fitting the measured BSCs with the spherical Gaussian model (SGM) or with the Structure Factor Model (SFM) to estimate the effective scatterer diameter (ESD) and acoustic concentration (EAC). The QUS parameters estimated by the sparse SGM and the concentrated SFM differ strongly from each other for HIU treated samples and suggests that the treated livers can be considered as concentrated media. Results showed that both integrated BSC and ESD estimated by the SFM increased as a function of temperature.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"67 1","pages":"544-547"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83460230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8925762
S. Setoodeh, U. Kemiktarak, F. Bayatpur, S. Fouladi, D. Feld
FBAR resonators comprise a thin film metal-piezoelectric-metal membrane with an air cavity on either side. Under high power operation an FBAR resonator exhibits a radial temperature distribution. A high power electro-thermal model must incorporate this radial temperature distribution so that it can adequately capture a resonator’s electrical behavior including hysteresis. Prior electro-thermal models, which have been used to model the high-power performance of solidly mounted BAW resonators, assume a uniform temperature distribution in the radial direction, and are thus incompatible for use in modeling FBAR resonators.
{"title":"A High Power Circuit Model of an FBAR Resonator for Use in Filter Design","authors":"S. Setoodeh, U. Kemiktarak, F. Bayatpur, S. Fouladi, D. Feld","doi":"10.1109/ULTSYM.2019.8925762","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925762","url":null,"abstract":"FBAR resonators comprise a thin film metal-piezoelectric-metal membrane with an air cavity on either side. Under high power operation an FBAR resonator exhibits a radial temperature distribution. A high power electro-thermal model must incorporate this radial temperature distribution so that it can adequately capture a resonator’s electrical behavior including hysteresis. Prior electro-thermal models, which have been used to model the high-power performance of solidly mounted BAW resonators, assume a uniform temperature distribution in the radial direction, and are thus incompatible for use in modeling FBAR resonators.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"43 1","pages":"2169-2173"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83485091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8925552
R. Wodnicki, Yu Liu, Victoria Chiu, D. Stephens, Qifa Zhou, K. Ferrara, Haochen Kang, Di Li, Yizhe Sun, Laiming Jiang, Ruimin Chen, Zeyu Chen, Hayong Jong, J. Foiret
Tiled large aperture 1.75D/2D transducer arrays with closely integrated ASIC electronics have the potential for implementing high channel count ultrasound probes for novel applications, however they must have high yield for a large number of elements to maintain good image quality. This constraint can be addressed by tiling together a number of smaller array modules to build up the larger aperture. In this work we present recent imaging results for large apertures with multiple tiled array modules integrating 2D arrays of wide bandwidth PIN-PMN-PT 1-3 composite piezo elements with custom-designed ASICs for buffering and multiplexing functions. The ASICs are optimized to obtain increased sensitivity of the high impedance 2D elements using buffering. We have also been developing novel second-generation ASICs to mitigate the effects of switching transients observed while imaging with the first-generation devices.
{"title":"Tiled Large Element 1.75D Aperture with Dual Array Modules by Adjacent Integration of PIN-PMN-PT Transducers and Custom High Voltage Switching ASICs","authors":"R. Wodnicki, Yu Liu, Victoria Chiu, D. Stephens, Qifa Zhou, K. Ferrara, Haochen Kang, Di Li, Yizhe Sun, Laiming Jiang, Ruimin Chen, Zeyu Chen, Hayong Jong, J. Foiret","doi":"10.1109/ULTSYM.2019.8925552","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925552","url":null,"abstract":"Tiled large aperture 1.75D/2D transducer arrays with closely integrated ASIC electronics have the potential for implementing high channel count ultrasound probes for novel applications, however they must have high yield for a large number of elements to maintain good image quality. This constraint can be addressed by tiling together a number of smaller array modules to build up the larger aperture. In this work we present recent imaging results for large apertures with multiple tiled array modules integrating 2D arrays of wide bandwidth PIN-PMN-PT 1-3 composite piezo elements with custom-designed ASICs for buffering and multiplexing functions. The ASICs are optimized to obtain increased sensitivity of the high impedance 2D elements using buffering. We have also been developing novel second-generation ASICs to mitigate the effects of switching transients observed while imaging with the first-generation devices.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"27 1","pages":"1955-1958"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83541013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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