Pub Date : 1999-10-17DOI: 10.1109/ULTSYM.1999.849301
D. Kouamé, J. Girault, A. Ouahabi, F. Patat
Cerebral emboli detection is a problem of considerable practical importance for monitoring vascular pathologies. If in most practical in vivo or in vitro experiments, big-size emboli detection seems comfortable, small-size emboli detection remains a challenge. The aim of this paper is to evaluate the performances of micro-emboli detections using statistical tools. The authors first introduce for this purpose a specific decision information through Autoregressive (AR) modeling. To overcome the problem of empirical detection threshold choice and quantify the reliability of the emboli detection, the chosen decision information makes it possible to link the threshold with the probability of false alarm (PFA). The authors then extend this approach to classical detection methods based on nonparametric analysis in order to perform comparisons, by using computer simulation of embolic signal. It is shown that reliable detection is not possible by the classical approaches when the Embolus-to-Blood Ratio (EBR) is lower than 10 dB since in this case the PFA is by far above 10%, whereas the authors' approach can detect small-size emboli with EBR as low as 5 dB since the PFA is then below 5%. In vivo measurements are finally performed in order to validate the authors' approach.
{"title":"Reliability evaluation of emboli detection using a statistical approach","authors":"D. Kouamé, J. Girault, A. Ouahabi, F. Patat","doi":"10.1109/ULTSYM.1999.849301","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849301","url":null,"abstract":"Cerebral emboli detection is a problem of considerable practical importance for monitoring vascular pathologies. If in most practical in vivo or in vitro experiments, big-size emboli detection seems comfortable, small-size emboli detection remains a challenge. The aim of this paper is to evaluate the performances of micro-emboli detections using statistical tools. The authors first introduce for this purpose a specific decision information through Autoregressive (AR) modeling. To overcome the problem of empirical detection threshold choice and quantify the reliability of the emboli detection, the chosen decision information makes it possible to link the threshold with the probability of false alarm (PFA). The authors then extend this approach to classical detection methods based on nonparametric analysis in order to perform comparisons, by using computer simulation of embolic signal. It is shown that reliable detection is not possible by the classical approaches when the Embolus-to-Blood Ratio (EBR) is lower than 10 dB since in this case the PFA is by far above 10%, whereas the authors' approach can detect small-size emboli with EBR as low as 5 dB since the PFA is then below 5%. In vivo measurements are finally performed in order to validate the authors' approach.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116102021","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 : 1999-10-17DOI: 10.1109/ULTSYM.1999.849361
J. Knuuttila, J. Koskela, P. Tikka, M. Salomaa, C. Hartmann, V. Plessky
We discuss an acoustic loss mechanism in leaky surface-acoustic wave resonators on 36°YX-cut lithium tantalate substrate. Our recent acoustic field scans performed with an optical Michelson interferometer revealed a spatially asymmetric acoustic field atop the busbars of a resonator, giving rise to acoustic beams which escape the resonator area and lead to undesired losses. Here, we link the phenomenon with the inherent crystalline anisotropy of the substrate crystal: the shape of the slowness curves and the asymmetry of the polarization for the leaky surface-acoustic waves propagating at an angle with respect to the crystal X-axis.
{"title":"Asymmetric acoustic radiation in leaky SAW resonators on lithium tantalate","authors":"J. Knuuttila, J. Koskela, P. Tikka, M. Salomaa, C. Hartmann, V. Plessky","doi":"10.1109/ULTSYM.1999.849361","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849361","url":null,"abstract":"We discuss an acoustic loss mechanism in leaky surface-acoustic wave resonators on 36°YX-cut lithium tantalate substrate. Our recent acoustic field scans performed with an optical Michelson interferometer revealed a spatially asymmetric acoustic field atop the busbars of a resonator, giving rise to acoustic beams which escape the resonator area and lead to undesired losses. Here, we link the phenomenon with the inherent crystalline anisotropy of the substrate crystal: the shape of the slowness curves and the asymmetry of the polarization for the leaky surface-acoustic waves propagating at an angle with respect to the crystal X-axis.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"218 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115525813","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 : 1999-10-17DOI: 10.1109/ULTSYM.1999.849448
H. Fang, Jia-shi Yang, Q. Jiang
This paper represents an analysis of surface waves propagating in rotating piezoelectric solids. The analysis shows that the effect of rotation on wave speed may be of first- or second-order of the rotation rate, depending on the propagation direction and the orientation of the material. For certain materials there exist two surface waves corresponding to the Rayleigh wave and the Bleustein-Gulyaev wave. For some other materials there exists one surface wave only.
{"title":"Gyroscopic effect on surface waves in piezoelectrics","authors":"H. Fang, Jia-shi Yang, Q. Jiang","doi":"10.1109/ULTSYM.1999.849448","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849448","url":null,"abstract":"This paper represents an analysis of surface waves propagating in rotating piezoelectric solids. The analysis shows that the effect of rotation on wave speed may be of first- or second-order of the rotation rate, depending on the propagation direction and the orientation of the material. For certain materials there exist two surface waves corresponding to the Rayleigh wave and the Bleustein-Gulyaev wave. For some other materials there exists one surface wave only.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114744867","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 : 1999-10-17DOI: 10.1109/ULTSYM.1999.849498
K. Sakai, O. Kanda, K. Yamamoto, K. Takagi
The acoustic diffusion wave in a turbid medium including randomly dispersed wave scatterers was observed. Ultrasonic wave at 15 MHz was modulated in amplitude and emitted into water suspension of polystyrene beads with 0.2 mm in diameter. Ray trace of the wave takes a random walk in the multiple scattering, and the acoustic energy flows in a diffusional manner. The spatial distribution of the oscillating acoustic energy was observed with an optical probe based on the Raman-Nath diffraction. The wavenumber and the spatial damping of the diffusion waves were determined at the modulation frequency of 4-20 kHz range. The results were well described by a modified diffusion theory including the effect of ultrasonic absorption. The diffusion constant and the lifetime of the acoustic energy were determined, which led to the transport mean free path and the ultrasonic absorption. The experiment was made at different volume fractions of the suspension, and l* and the lifetime were found to decrease with the number density of the scatterer.
{"title":"Acoustic diffusion wave in turbid media","authors":"K. Sakai, O. Kanda, K. Yamamoto, K. Takagi","doi":"10.1109/ULTSYM.1999.849498","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849498","url":null,"abstract":"The acoustic diffusion wave in a turbid medium including randomly dispersed wave scatterers was observed. Ultrasonic wave at 15 MHz was modulated in amplitude and emitted into water suspension of polystyrene beads with 0.2 mm in diameter. Ray trace of the wave takes a random walk in the multiple scattering, and the acoustic energy flows in a diffusional manner. The spatial distribution of the oscillating acoustic energy was observed with an optical probe based on the Raman-Nath diffraction. The wavenumber and the spatial damping of the diffusion waves were determined at the modulation frequency of 4-20 kHz range. The results were well described by a modified diffusion theory including the effect of ultrasonic absorption. The diffusion constant and the lifetime of the acoustic energy were determined, which led to the transport mean free path and the ultrasonic absorption. The experiment was made at different volume fractions of the suspension, and l* and the lifetime were found to decrease with the number density of the scatterer.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121212328","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 : 1999-10-17DOI: 10.1109/ULTSYM.1999.849167
Wei Luo, A. Ding, Haosu Luo, Z. Yin
Electric properties of relaxor ferroelectric Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ (PMN-PT) single crystals near the rhombohedral-tetragonal transition under high-field phase boundary were studied. The single crystals in the <001> direction exhibited a remanent polarization of 30 /spl mu/C/cm/sup 2/, coercive field of 3.5 kV/cm and switchable polarization of 51 /spl mu/C/cm/sup 2/ at 9 kV/cm. The polarization-temperature dependence of the crystals indicated a reduction of 5% in the remanent polarization and 3.2% in switchable polarization at 80/spl deg/C. The remanent polarization decreased to 5 /spl mu/C/cm/sup 2/ at 146/spl deg/C (T/sub m/). However the switchable polarization fell to zero at that temperature. A loss of 12% in the polarization was observed in the switching cycles up to 2.5/spl times/10/sup 8/ reversals under bipolar pulse of 12 kV/cm. On the other hand, the crystals have a resistivity of 1.6/spl times/10/sup 9/ /spl Omega/-cm at 100/spl deg/C and with a electric field of 10 kV/cm. These results are favorable to applications for device design of the PMN-PT crystals.
{"title":"High-field properties of PMN-PT single crystals","authors":"Wei Luo, A. Ding, Haosu Luo, Z. Yin","doi":"10.1109/ULTSYM.1999.849167","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849167","url":null,"abstract":"Electric properties of relaxor ferroelectric Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ (PMN-PT) single crystals near the rhombohedral-tetragonal transition under high-field phase boundary were studied. The single crystals in the <001> direction exhibited a remanent polarization of 30 /spl mu/C/cm/sup 2/, coercive field of 3.5 kV/cm and switchable polarization of 51 /spl mu/C/cm/sup 2/ at 9 kV/cm. The polarization-temperature dependence of the crystals indicated a reduction of 5% in the remanent polarization and 3.2% in switchable polarization at 80/spl deg/C. The remanent polarization decreased to 5 /spl mu/C/cm/sup 2/ at 146/spl deg/C (T/sub m/). However the switchable polarization fell to zero at that temperature. A loss of 12% in the polarization was observed in the switching cycles up to 2.5/spl times/10/sup 8/ reversals under bipolar pulse of 12 kV/cm. On the other hand, the crystals have a resistivity of 1.6/spl times/10/sup 9/ /spl Omega/-cm at 100/spl deg/C and with a electric field of 10 kV/cm. These results are favorable to applications for device design of the PMN-PT crystals.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123861758","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 : 1999-10-17DOI: 10.1109/ULTSYM.1999.849379
G. Behme, E. Chilla, H.-J. Frohlich
We present first measurements on acoustic waves with quasi longitudinal polarization on quartz and lithium tantalate substrates as well as layered systems carried out by a scanning acoustic force microscope (SAFM). Acoustic phase velocities were measured for microscopic areas showing a good agreement with numerical calculations. The influence of the penetration depth of the high velocity pseudo SAWs (HVPSAW) on the SAFM signal formation is discussed.
{"title":"Investigation of longitudinal leaky surface acoustic waves by scanning acoustic force microscopy","authors":"G. Behme, E. Chilla, H.-J. Frohlich","doi":"10.1109/ULTSYM.1999.849379","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849379","url":null,"abstract":"We present first measurements on acoustic waves with quasi longitudinal polarization on quartz and lithium tantalate substrates as well as layered systems carried out by a scanning acoustic force microscope (SAFM). Acoustic phase velocities were measured for microscopic areas showing a good agreement with numerical calculations. The influence of the penetration depth of the high velocity pseudo SAWs (HVPSAW) on the SAFM signal formation is discussed.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"254 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124180925","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 : 1999-10-17DOI: 10.1109/ULTSYM.1999.849209
J. Zhao, Carlos H. F. Alves, K. Snook, J. Cannata, W.H. Chen, R. Meyer, S. Ayyappan, T. Ritter, K. Shung
The performance of high frequency single element transducers depends greatly upon the mechanical and electrical properties of the piezoelectric materials used. This study compares the design and performance of transducers incorporating different materials. The materials selected include 1-3 PZT fiber composite, PbTiO/sub 3/ ceramic, PVDF film and LiNbO/sub 3/ single crystal. Transducers were tested for insertion loss and -6 dB bandwidth using the pulse/echo response from a flat quartz target. All transducers were constructed with a 3 mm aperture size and f number between 2 to 3. Backing and matching materials were varied to optimize each design. An additional design consideration is electrical impedance matching to 50 ohm especially for the fiber composite and PbTiO/sub 3/ transducers due to their relatively high dielectric constant. Sensitivity between transducers displayed a significant variation, with insertion losses from -21.3 dB to -46 dB. -6 dB bandwidths were in the range of 47 to 118%. In-vitro UBM images of the human eye were made to compare the different transducers.
{"title":"Performance of 50 MHz transducers incorporating fiber composite, PVDF, PbTiO/sub 3/ and LiNbO/sub 3/","authors":"J. Zhao, Carlos H. F. Alves, K. Snook, J. Cannata, W.H. Chen, R. Meyer, S. Ayyappan, T. Ritter, K. Shung","doi":"10.1109/ULTSYM.1999.849209","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849209","url":null,"abstract":"The performance of high frequency single element transducers depends greatly upon the mechanical and electrical properties of the piezoelectric materials used. This study compares the design and performance of transducers incorporating different materials. The materials selected include 1-3 PZT fiber composite, PbTiO/sub 3/ ceramic, PVDF film and LiNbO/sub 3/ single crystal. Transducers were tested for insertion loss and -6 dB bandwidth using the pulse/echo response from a flat quartz target. All transducers were constructed with a 3 mm aperture size and f number between 2 to 3. Backing and matching materials were varied to optimize each design. An additional design consideration is electrical impedance matching to 50 ohm especially for the fiber composite and PbTiO/sub 3/ transducers due to their relatively high dielectric constant. Sensitivity between transducers displayed a significant variation, with insertion losses from -21.3 dB to -46 dB. -6 dB bandwidths were in the range of 47 to 118%. In-vitro UBM images of the human eye were made to compare the different transducers.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122076863","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 : 1999-10-17DOI: 10.1109/ULTSYM.1999.849186
E. Ledet, C. Zanelli
Effective aperture is a commonly used measure of the amount of acoustic or electrical crosstalk between elements in ultrasonic arrays. It is also important to assess element-to-element uniformity and quality of the separation between the elements. This parameter is obtained from the beam profile obtained by pulsing each individual element with a known excitation function. The traditional method, using hydrophones, presents many challenges that are overcome by the proposed method. Using a quantitative schlieren system, we imaged the acoustic burst from an array element. Automated processing allows determination of the average intensity over the burst at all angles (angular beam profile) and its width is used to determine the effective aperture for that element. Examples are presented for floating and purposefully coupled neighboring elements, and the results are in good agreement with those obtained with a hydrophone. The algorithm used for image analysis is also described.
{"title":"A novel, rapid method to measure the effective aperture of array elements","authors":"E. Ledet, C. Zanelli","doi":"10.1109/ULTSYM.1999.849186","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849186","url":null,"abstract":"Effective aperture is a commonly used measure of the amount of acoustic or electrical crosstalk between elements in ultrasonic arrays. It is also important to assess element-to-element uniformity and quality of the separation between the elements. This parameter is obtained from the beam profile obtained by pulsing each individual element with a known excitation function. The traditional method, using hydrophones, presents many challenges that are overcome by the proposed method. Using a quantitative schlieren system, we imaged the acoustic burst from an array element. Automated processing allows determination of the average intensity over the burst at all angles (angular beam profile) and its width is used to determine the effective aperture for that element. Examples are presented for floating and purposefully coupled neighboring elements, and the results are in good agreement with those obtained with a hydrophone. The algorithm used for image analysis is also described.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124071305","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 : 1999-10-17DOI: 10.1109/ULTSYM.1999.849257
T. Karjalainen, J.S. Thierman, K. Hynynen
Vibro-acoustography, a relatively new imaging modality, is applied to imaging ex vivo liver tissue from calves and New Zealand white rabbits. In the first series of experiments, calf liver tissue was heated while the USAE response and temperature were recorded. This demonstrated a strong temperature dependence of the USAE signal. In the second series of experiments lesions were created with focused ultrasound and then raster scanned in the focal plane by the two intersecting focused ultrasound fields. The FWHM of these USAE-amplitude scans correlates well with the lesion sizes measured in histological studies. This method successfully rendered high-resolution images of the necrosed lesions in the liver tissue. In addition, a correlation between the time after sonication and amplitude of the USAE response was observed.
{"title":"Ultrasound acoustic stimulated emission for controlling thermal surgery","authors":"T. Karjalainen, J.S. Thierman, K. Hynynen","doi":"10.1109/ULTSYM.1999.849257","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849257","url":null,"abstract":"Vibro-acoustography, a relatively new imaging modality, is applied to imaging ex vivo liver tissue from calves and New Zealand white rabbits. In the first series of experiments, calf liver tissue was heated while the USAE response and temperature were recorded. This demonstrated a strong temperature dependence of the USAE signal. In the second series of experiments lesions were created with focused ultrasound and then raster scanned in the focal plane by the two intersecting focused ultrasound fields. The FWHM of these USAE-amplitude scans correlates well with the lesion sizes measured in histological studies. This method successfully rendered high-resolution images of the necrosed lesions in the liver tissue. In addition, a correlation between the time after sonication and amplitude of the USAE response was observed.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128583159","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 : 1999-10-17DOI: 10.1109/ULTSYM.1999.849226
M. Bae, M. Jeong, Tae-Kyong Song, Y. Ahn
Recently, a method for focusing at all imaging points both in transmit and receive was proposed. This method uses transmit synthetic focusing and receive dynamic focusing in conventional B-mode ultrasound imaging systems. Transmit focusing is synthesized using the RF data of each scanline, together with all other relevant scanline data previously stored. Experimental results show that the proposed method improves lateral resolution and SNR of real-time B-mode images at all imaging depth points.
{"title":"Experimental study of transmit synthetic focusing combined with receive dynamic focusing in B-mode ultrasound imaging systems","authors":"M. Bae, M. Jeong, Tae-Kyong Song, Y. Ahn","doi":"10.1109/ULTSYM.1999.849226","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849226","url":null,"abstract":"Recently, a method for focusing at all imaging points both in transmit and receive was proposed. This method uses transmit synthetic focusing and receive dynamic focusing in conventional B-mode ultrasound imaging systems. Transmit focusing is synthesized using the RF data of each scanline, together with all other relevant scanline data previously stored. Experimental results show that the proposed method improves lateral resolution and SNR of real-time B-mode images at all imaging depth points.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129124870","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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