Pub Date : 2019-10-01DOI: 10.1109/ULTSYM.2019.8925936
N. Ouzir, J. Bioucas-Dias, A. Basarab, J. Tourneret
Estimating the cardiac motion from ultrasound (US) images is an ill-posed problem that requires regularization. In a recent study, it was shown that constraining the cardiac motion fields to be patch-wise sparse in a learnt overcomplete motion dictionary is more accurate than local parametric models (affine) or global functions (B-splines, total variation). In this work, we extend this method by incorporating temporal smoothness in a multi-frame optical-flow (OF) strategy. An efficient optimization strategy using the constrained split augmented Lagrangian shrinkage algorithm (C-SALSA) is proposed. The performance is evaluated on a realistic simulated cardiac dataset with available ground-truth. A comparison with the pairwise approach shows the interest of the proposed temporal regularization and multi-frame strategy in terms of accuracy and computational time.
{"title":"Robust Cardiac Motion Estimation With Dictionary Learning and Temporal Regularization for Ultrasound Imaging","authors":"N. Ouzir, J. Bioucas-Dias, A. Basarab, J. Tourneret","doi":"10.1109/ULTSYM.2019.8925936","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925936","url":null,"abstract":"Estimating the cardiac motion from ultrasound (US) images is an ill-posed problem that requires regularization. In a recent study, it was shown that constraining the cardiac motion fields to be patch-wise sparse in a learnt overcomplete motion dictionary is more accurate than local parametric models (affine) or global functions (B-splines, total variation). In this work, we extend this method by incorporating temporal smoothness in a multi-frame optical-flow (OF) strategy. An efficient optimization strategy using the constrained split augmented Lagrangian shrinkage algorithm (C-SALSA) is proposed. The performance is evaluated on a realistic simulated cardiac dataset with available ground-truth. A comparison with the pairwise approach shows the interest of the proposed temporal regularization and multi-frame strategy in terms of accuracy and computational time.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"13 1-2 1","pages":"2326-2329"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78312764","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.2019.8925820
T. Mateo, Marie-Coline Dumoux, Emmanuel Montauban, G. Férin, A. Nguyen-Dinh
Increasing use of energetic modes in modern ultrasonography has made efficient thermal management mandatory in medical transducers design. In this work, efficiency of different thermal conduction paths (central, peripheral, both), as well as different heat ways out (probe nose, whole probe body housing, cable braid shield) are investigated. Starting from a typical acoustic design for a 2,8 MHz phased array, 6 mock-ups are derived, using an acoustical stack either optimized for acoustical or thermal performances. Basically, each mock-up explores a particular thermal path, using passive solutions such as thermal fin, highly conductive backing (135 W/m/K), layers (85 W/m/K), resin (2.9W/m/K), etc. Thermal performances are then assessed in air, following a measurement protocol based on IEC60601-2-37. A heating burst is sent during 10 mins at high PRF, while an IR camera records the temperature progress at the surface of the transducer. IR frame are then processed to extract, for each mock-up, the hot spot profile during the heating stage. Further analyze of its dynamic provides insight on the impact of the different thermal solutions here investigated.
{"title":"Thermal management solutions for medical ultrasound probes","authors":"T. Mateo, Marie-Coline Dumoux, Emmanuel Montauban, G. Férin, A. Nguyen-Dinh","doi":"10.1109/ULTSYM.2019.8925820","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925820","url":null,"abstract":"Increasing use of energetic modes in modern ultrasonography has made efficient thermal management mandatory in medical transducers design. In this work, efficiency of different thermal conduction paths (central, peripheral, both), as well as different heat ways out (probe nose, whole probe body housing, cable braid shield) are investigated. Starting from a typical acoustic design for a 2,8 MHz phased array, 6 mock-ups are derived, using an acoustical stack either optimized for acoustical or thermal performances. Basically, each mock-up explores a particular thermal path, using passive solutions such as thermal fin, highly conductive backing (135 W/m/K), layers (85 W/m/K), resin (2.9W/m/K), etc. Thermal performances are then assessed in air, following a measurement protocol based on IEC60601-2-37. A heating burst is sent during 10 mins at high PRF, while an IR camera records the temperature progress at the surface of the transducer. IR frame are then processed to extract, for each mock-up, the hot spot profile during the heating stage. Further analyze of its dynamic provides insight on the impact of the different thermal solutions here investigated.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"29 1","pages":"1757-1760"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74884881","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.2019.8925574
Rui Wang, Fan Fan, Qiang Zhang, Fei Shen, P. Laugier, Haijun Niu
Resonant ultrasound spectroscopy (RUS) is a well-established method of identifying the elastic coefficients of solid materials. The Rayleigh-Ritz method (RRZ) is usually used to calculate the natural frequencies of a specimen, where the specimen needs to be processed into a certain regular body. This requirement is hard to meet for some materials with size limitations or special physical/chemical properties. Our objective was to address this limitation with a new approach adapted to specimens of arbitrary geometry by combining RUS with micro computed tomography (μ-CT) and finite element modeling (FEM). The accuracy of the proposed approach was assessed using titanium irregular specimens. The elastic coefficient results showed good agreements (below 2%) with values of a rectangular parallelepiped specimen measured by the RRZ-based RUS. This study overcomes the limitation of RUS to specimen geometry and allows identification of the elastic properties of irregular specimens with good accuracy.
{"title":"FEM-based Resonant Ultrasound Spectroscopy Method for Measurement of the Elastic Properties of Irregular Solid Specimens","authors":"Rui Wang, Fan Fan, Qiang Zhang, Fei Shen, P. Laugier, Haijun Niu","doi":"10.1109/ULTSYM.2019.8925574","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925574","url":null,"abstract":"Resonant ultrasound spectroscopy (RUS) is a well-established method of identifying the elastic coefficients of solid materials. The Rayleigh-Ritz method (RRZ) is usually used to calculate the natural frequencies of a specimen, where the specimen needs to be processed into a certain regular body. This requirement is hard to meet for some materials with size limitations or special physical/chemical properties. Our objective was to address this limitation with a new approach adapted to specimens of arbitrary geometry by combining RUS with micro computed tomography (μ-CT) and finite element modeling (FEM). The accuracy of the proposed approach was assessed using titanium irregular specimens. The elastic coefficient results showed good agreements (below 2%) with values of a rectangular parallelepiped specimen measured by the RRZ-based RUS. This study overcomes the limitation of RUS to specimen geometry and allows identification of the elastic properties of irregular specimens with good accuracy.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"115 1","pages":"1249-1251"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74901894","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.2019.8925897
Liyuan He, Weiqiang Liu, Dawei Wu
Mechanical scanning of a single-element transducer and electronic scanning of an array transducer have been mostly utilized for high frequency ultrasound imaging. Considering that mechanical scanning systems are bulky and development of high frequency transducer arrays and their imaging systems are sophisticated and expensive, here we propose a novel approach, where a scanning forward-looking (FL) single-element transducer embedded in a steel pipe is driven by a tubular piezoelectric actuator, to get both B-scan and C-scan images. In the work, a positioning system composed of a two-dimensional position sensitive detector (PSD) is used to obtain the accurate information of the transducer position in real time. Ultrasonic signals and position information are acquired continuously while scanning the transducer across a tungsten wire phantom to reconstruct B-scan and C-scan images. The imaging performance of the scanning system is compared with traditional scanning imaging results. This work demonstrates that it is feasible and promising to obtain B-scan and C-scan high frequency ultrasound imaging by simply scanning a single-element transducer driven by a tubular piezoelectric actuator.
{"title":"High Frequency Ultrasound Imaging by Scanning a Single-element Transducer","authors":"Liyuan He, Weiqiang Liu, Dawei Wu","doi":"10.1109/ULTSYM.2019.8925897","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925897","url":null,"abstract":"Mechanical scanning of a single-element transducer and electronic scanning of an array transducer have been mostly utilized for high frequency ultrasound imaging. Considering that mechanical scanning systems are bulky and development of high frequency transducer arrays and their imaging systems are sophisticated and expensive, here we propose a novel approach, where a scanning forward-looking (FL) single-element transducer embedded in a steel pipe is driven by a tubular piezoelectric actuator, to get both B-scan and C-scan images. In the work, a positioning system composed of a two-dimensional position sensitive detector (PSD) is used to obtain the accurate information of the transducer position in real time. Ultrasonic signals and position information are acquired continuously while scanning the transducer across a tungsten wire phantom to reconstruct B-scan and C-scan images. The imaging performance of the scanning system is compared with traditional scanning imaging results. This work demonstrates that it is feasible and promising to obtain B-scan and C-scan high frequency ultrasound imaging by simply scanning a single-element transducer driven by a tubular piezoelectric actuator.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"72 1","pages":"2376-2379"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75133343","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.2019.8926304
Yuanyuan Wang, Chengwu Huang, Shuhong Ma, Qiong He, F. Lan, Jianwen Luo
Marfan syndrome (MS) is a hereditary connective tissue disease characterized by the defection of collagen complex and decrease of the connection between collagen and elastic fibers. Thoracic aortic dissection (TAD) is a common cause of death for patients with MS. In this study, we performed pulse wave imaging (PWI) in a β-aminopropionitrile (BAPN) induced, MS-relevant mouse model of TAD and measured the pulse wave velocities (PWVs) to assess the aortic stiffness related to the occurrence of TAD in MS. Three-week-old male mice were fed with regular diet (control group, n = 6) and diet with BAPN (BAPN group, n = 10) for 20 days, respectively. BAPN inhibits the cross-linking of collagen and elastin in systemic arteries, similar to TAD in MS patients, and could induce the occurrence of TAD in mice. PWI of the proximal abdominal aorta was performed every two days with a SonixMDP system and an L40-8 probe. Focused wave imaging with a reduced beam density was used to obtain a high frame rate of 980 Hz. The distension velocities of the aortic wall were estimated using speckle tracking and PWVs at the systolic foot (PWV_sf) and dicrotic notch (PWV_dn) were measured in vivo. Histologic examinations were performed on the thoracic aorta to confirm the presence of TAD. Statistical significance was assessed using two-tailed t tests. After 20 days of feeding, 8 mice from the BAPN group were found to have TAD in the histologic examinations. No significant differences in PWV_sf and PWV_dn were found between the control group (n= 6) and the TAD group (n = 8) before BAPN diet (p = 0.60 for PWV_sf, p = 0.98 for PWV_dn). In the last measurements after BAPN diet, PWV_dn from the TAD group was lower than that from the control group (p < 0.05), while no significant difference was observed in PWV_sf (p=0.48). PWV_dn increased with the age of the mice for both the control and TAD groups, while the increment of PWV_dn between the last and first measurements was significantly lower in the TAD group (p < 0.05). Such difference was not found in PWV_sf (p = 0.85). These findings indicate that PWV_dn of the abdominal aorta can reflect the arterial stiffness change related to TAD and may be a promising index to monitor the aortic mechanical properties of MS.
{"title":"Pulse Wave Imaging for Assessing Arterial Stiffness Change in A Mouse Model of Thoracic Aortic Dissection in Marfan Syndrome","authors":"Yuanyuan Wang, Chengwu Huang, Shuhong Ma, Qiong He, F. Lan, Jianwen Luo","doi":"10.1109/ULTSYM.2019.8926304","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8926304","url":null,"abstract":"Marfan syndrome (MS) is a hereditary connective tissue disease characterized by the defection of collagen complex and decrease of the connection between collagen and elastic fibers. Thoracic aortic dissection (TAD) is a common cause of death for patients with MS. In this study, we performed pulse wave imaging (PWI) in a β-aminopropionitrile (BAPN) induced, MS-relevant mouse model of TAD and measured the pulse wave velocities (PWVs) to assess the aortic stiffness related to the occurrence of TAD in MS. Three-week-old male mice were fed with regular diet (control group, n = 6) and diet with BAPN (BAPN group, n = 10) for 20 days, respectively. BAPN inhibits the cross-linking of collagen and elastin in systemic arteries, similar to TAD in MS patients, and could induce the occurrence of TAD in mice. PWI of the proximal abdominal aorta was performed every two days with a SonixMDP system and an L40-8 probe. Focused wave imaging with a reduced beam density was used to obtain a high frame rate of 980 Hz. The distension velocities of the aortic wall were estimated using speckle tracking and PWVs at the systolic foot (PWV_sf) and dicrotic notch (PWV_dn) were measured in vivo. Histologic examinations were performed on the thoracic aorta to confirm the presence of TAD. Statistical significance was assessed using two-tailed t tests. After 20 days of feeding, 8 mice from the BAPN group were found to have TAD in the histologic examinations. No significant differences in PWV_sf and PWV_dn were found between the control group (n= 6) and the TAD group (n = 8) before BAPN diet (p = 0.60 for PWV_sf, p = 0.98 for PWV_dn). In the last measurements after BAPN diet, PWV_dn from the TAD group was lower than that from the control group (p < 0.05), while no significant difference was observed in PWV_sf (p=0.48). PWV_dn increased with the age of the mice for both the control and TAD groups, while the increment of PWV_dn between the last and first measurements was significantly lower in the TAD group (p < 0.05). Such difference was not found in PWV_sf (p = 0.85). These findings indicate that PWV_dn of the abdominal aorta can reflect the arterial stiffness change related to TAD and may be a promising index to monitor the aortic mechanical properties of MS.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"1 1","pages":"2206-2209"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73214063","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.2019.8925874
J. Mateu, C. Collado, R. Aigner
This paper evaluates important aspect of acoustic filters based on a transversal configuration in order to foreseen the potential and limitations of this new configuration. These aspects are: effects of the losses of the resonators and external components, such as capacitors and inductors, sensitivity on the deviation of the impedance and resonant frequency of the resonators and effects of having a non-ideal balun. This study has been performed in a sixth order filter with asymmetric position of the transmission zeros.
{"title":"Practical issues on the implementation of acoustic transversal filters","authors":"J. Mateu, C. Collado, R. Aigner","doi":"10.1109/ULTSYM.2019.8925874","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925874","url":null,"abstract":"This paper evaluates important aspect of acoustic filters based on a transversal configuration in order to foreseen the potential and limitations of this new configuration. These aspects are: effects of the losses of the resonators and external components, such as capacitors and inductors, sensitivity on the deviation of the impedance and resonant frequency of the resonators and effects of having a non-ideal balun. This study has been performed in a sixth order filter with asymmetric position of the transmission zeros.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"36 1","pages":"2576-2579"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74319311","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.2019.8925926
Y. Benane, Vincent Perrot, L. Petrusca, O. Basset
3D fast/ultrasound imaging has emerged in the last years in research but still suffers from its poor image quality. Indeed, using plane/diverge waves does not permit to insonify the medium with sufficient energy at each point to get a good signal-to-noise ratio, contrast-to-noise-ratio or even resolution. On the other hand, coded excitation is currently used to increase signal-to-noise ratio and penetration depth. In this work, the objective is to combine 3D fast/ultrafast imaging with coded excitation to achieve better image quality at a high acquisition rate. Promising experimental results are obtained from both wire and cyst phantoms using a chirp excitation signal. The contrast-to-noise ratio and signal-to-noise ratio were improved by 4 dB and 2 dB respectively by the proposed method in comparison to the conventional way to do 3D imaging using a standard transmit. The improvement of the axial resolution of about 17% is the third important result obtained by the developed method still in comparison with the classical method. Experimental results show that an effective implementation on a research scanner of 3D coded excitation using plane wave imaging is possible.
{"title":"3D Fast Ultrasound Imaging Through Pulse Compression: An Experimental Study","authors":"Y. Benane, Vincent Perrot, L. Petrusca, O. Basset","doi":"10.1109/ULTSYM.2019.8925926","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925926","url":null,"abstract":"3D fast/ultrasound imaging has emerged in the last years in research but still suffers from its poor image quality. Indeed, using plane/diverge waves does not permit to insonify the medium with sufficient energy at each point to get a good signal-to-noise ratio, contrast-to-noise-ratio or even resolution. On the other hand, coded excitation is currently used to increase signal-to-noise ratio and penetration depth. In this work, the objective is to combine 3D fast/ultrafast imaging with coded excitation to achieve better image quality at a high acquisition rate. Promising experimental results are obtained from both wire and cyst phantoms using a chirp excitation signal. The contrast-to-noise ratio and signal-to-noise ratio were improved by 4 dB and 2 dB respectively by the proposed method in comparison to the conventional way to do 3D imaging using a standard transmit. The improvement of the axial resolution of about 17% is the third important result obtained by the developed method still in comparison with the classical method. Experimental results show that an effective implementation on a research scanner of 3D coded excitation using plane wave imaging is possible.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"98 1","pages":"452-455"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74634014","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.2019.8925551
A. Hannah, M. Noble-Vranish, C. Genstler
To date, there have been no studies that use ultrasound imaging tools to measure the spatial extent of thrombolysis from catheter-based treatments. This study uses contrast-enhanced ultrasound imaging to measure and visualize plasma clot lysis by either an EkoSonic endovascular system or a conventional side-hole drug delivery catheter. Ultrasound enhances drug-mediated thrombolytic therapy by 80-350%; the degree of enhancement depends on the drug delivery strategy, and the presence or absence of plasma flow through the system during therapy. The measurements and visualizations give a more detailed picture of the lysis process and may inform future strategies for ultrasound-assisted catheter-based intervention.
{"title":"Measurement of Thrombolysis Enhanced by EkoSonic Catheter-Based Endovascular Therapy","authors":"A. Hannah, M. Noble-Vranish, C. Genstler","doi":"10.1109/ULTSYM.2019.8925551","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925551","url":null,"abstract":"To date, there have been no studies that use ultrasound imaging tools to measure the spatial extent of thrombolysis from catheter-based treatments. This study uses contrast-enhanced ultrasound imaging to measure and visualize plasma clot lysis by either an EkoSonic endovascular system or a conventional side-hole drug delivery catheter. Ultrasound enhances drug-mediated thrombolytic therapy by 80-350%; the degree of enhancement depends on the drug delivery strategy, and the presence or absence of plasma flow through the system during therapy. The measurements and visualizations give a more detailed picture of the lysis process and may inform future strategies for ultrasound-assisted catheter-based intervention.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"69 1","pages":"2233-2237"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72654368","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.2019.8925840
H. Shen, C. Barthélémy, E. Khoury, Y. Zemmoura, J. Remeniéras, A. Basarab, Denis Kouamé
In this paper, we address the problem of high-resolution flow estimation in medical ultrasound images. Imaging methods based on ultrafast sequences associated with adaptive spatiotemporal SVD clutter filtering have recently improved blood flow detection. Herein, we investigate a new way of addressing the clutter filtering problem in order to obtain a high-resolution flow estimation, through solving an inverse problem corresponding to both deconvolution and robust principal component analysis. Applied to tissue vascularization imaging via power Doppler images, the proposed method highlights finer details on experimental data compared to existing approaches.
{"title":"High-resolution and high-sensitivity blood flow estimation using optimization approaches with application to vascularization imaging","authors":"H. Shen, C. Barthélémy, E. Khoury, Y. Zemmoura, J. Remeniéras, A. Basarab, Denis Kouamé","doi":"10.1109/ULTSYM.2019.8925840","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925840","url":null,"abstract":"In this paper, we address the problem of high-resolution flow estimation in medical ultrasound images. Imaging methods based on ultrafast sequences associated with adaptive spatiotemporal SVD clutter filtering have recently improved blood flow detection. Herein, we investigate a new way of addressing the clutter filtering problem in order to obtain a high-resolution flow estimation, through solving an inverse problem corresponding to both deconvolution and robust principal component analysis. Applied to tissue vascularization imaging via power Doppler images, the proposed method highlights finer details on experimental data compared to existing approaches.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"7 1","pages":"467-470"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73864016","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.2019.8926063
Tuukka Kekkonen, J. Mäkinen, J. Hyvönen, A. Kuronen, T. Kotiaho, A. Salmi, E. Hæggström
We demonstrate a way of focusing acoustic waves using a water immersed solid-solid lens. The focusing action is predicted by finite element simulations. This estimate is then compared to experiments. We use the lens to image a resolution sample and compare this image to one imaged with a comparable commercial immersion transducer.
{"title":"3D acoustic jet","authors":"Tuukka Kekkonen, J. Mäkinen, J. Hyvönen, A. Kuronen, T. Kotiaho, A. Salmi, E. Hæggström","doi":"10.1109/ULTSYM.2019.8926063","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8926063","url":null,"abstract":"We demonstrate a way of focusing acoustic waves using a water immersed solid-solid lens. The focusing action is predicted by finite element simulations. This estimate is then compared to experiments. We use the lens to image a resolution sample and compare this image to one imaged with a comparable commercial immersion transducer.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"18 1","pages":"586-589"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79095674","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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