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Auteur : Grafiati
Publié le 10 mars 2023

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1

Yang, Chen, Jie Xu, Yiwen Xu, Yaoyao Cui et Yang Jiao. « Coherent Plane-Wave Compounding Based on United Coherence Factor ». IEEE Access 8 (2020) : 112751–61. http://dx.doi.org/10.1109/access.2020.3003136.

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Guo, Wei, Yuanyuan Wang et Jinhua Yu. « A Sibelobe Suppressing Beamformer for Coherent Plane Wave Compounding ». Applied Sciences 6, no 11 (17 novembre 2016) : 359. http://dx.doi.org/10.3390/app6110359.

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Rodriguez-Molares, Alfonso, Hans Torp, Bastien Denarie et Lasse Løvstakken. « The angular apodization in coherent plane-wave compounding [Correspondence] ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 62, no 11 (novembre 2015) : 2018–23. http://dx.doi.org/10.1109/tuffc.2015.007183.

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Wang, Yadan, Chichao Zheng, Hu Peng et Chaoxue Zhang. « Coherent Plane-Wave Compounding Based on Normalized Autocorrelation Factor ». IEEE Access 6 (2018) : 36927–38. http://dx.doi.org/10.1109/access.2018.2852641.

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Wang, Yadan, Chichao Zheng et Hu Peng. « Dynamic coherence factor based on the standard deviation for coherent plane-wave compounding ». Computers in Biology and Medicine 108 (mai 2019) : 249–62. http://dx.doi.org/10.1016/j.compbiomed.2019.03.022.

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Wang, Yadan, Chichao Zheng, Xiaoyan Zhao et Hu Peng. « Adaptive scaling Wiener postfilter using generalized coherence factor for coherent plane-wave compounding ». Computers in Biology and Medicine 116 (janvier 2020) : 103564. http://dx.doi.org/10.1016/j.compbiomed.2019.103564.

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7

Shen, Che-Chou, et Pei-Ying Hsieh. « Two-Dimensional Spatial Coherence for Ultrasonic DMAS Beamforming in Multi-Angle Plane-Wave Imaging ». Applied Sciences 9, no 19 (23 septembre 2019) : 3973. http://dx.doi.org/10.3390/app9193973.

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Ultrasonic multi-angle plane-wave (PW) coherent compounding relies on delay-and-sum (DAS) beamforming of two-dimensional (2D) echo matrix in both the dimensions PW transmit angle and receiving channel to construct each image pixel. Due to the characteristics of DAS beamforming, PW coherent compounding may suffer from high image clutter when the number of transmit angles is kept low for ultrafast image acquisition. Delay-multiply-and-sum (DMAS) beamforming exploits the spatial coherence of the receiving aperture to suppress clutter interference. Previous attempts to introduce DMAS beamforming into multi-angle PW imaging has been reported but only in either dimension of the 2D echo matrix. In this study, a novel DMAS operation is proposed to extract the 2D spatial coherence of echo matrix for further improvement of image quality. The proposed 2D-DMAS method relies on a flexibly tunable p value to manipulate the signal coherence in the beamforming output. For p = 2.0 as an example, simulation results indicate that 2D-DMAS outperforms other one-dimensional DMAS methods by at least 9.3 dB in terms of ghost-artifact suppression. Experimental results also show that 2D-DMAS provides the highest improvement in lateral resolution by 32% and in image contrast by 15.6 dB relative to conventional 2D-DAS beamforming. Nonetheless, since 2D-DMAS emphasizes signal coherence more than its one-dimensional DMAS counterparts, it suffers from the most elevated speckle variation and the granular pattern in the tissue background.
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Yang, Chen, Yang Jiao, Tingyi Jiang, Yiwen Xu et Yaoyao Cui. « A United Sign Coherence Factor Beamformer for Coherent Plane-Wave Compounding with Improved Contrast ». Applied Sciences 10, no 7 (26 mars 2020) : 2250. http://dx.doi.org/10.3390/app10072250.

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In this study, we present a united sign coherence factor beamformer for coherent plane-wave compounding (CPWC). CPWC is capable of reaching an image quality comparable to the conventional B-mode with a much higher frame rate. Conventional coherence factor (CF) based beamformers for CPWC are based on one-dimensional (1D) frameworks, either in the spatial coherence dimension or angular coherence dimension. Both 1D frameworks do not take into account the coherence information of the dimensions of each other. In order to take full advantage of the radio-frequency (RF) data, this paper proposes a united framework containing both spatial and angular information for CPWC. A united sign coherence factor beamformer (uSCF), which combines the conventional sign coherence factor (SCF) and the united framework, is introduced in the paper as well. The proposed beamformer is compared with the conventional 1D SCF beamformers (spatial and angular dimension beamformers) using simulation, phantom and in vivo studies. In the in vivo images, the proposed method improves the contrast ratio (CR) and generalized contrast-to-noise ratio (gCNR) by 197% and 20% over CPWC. Compared with other 1D methods, uSCF also shows an improved contrast and lateral resolution on all datasets.
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Go, Dooyoung, Jinbum Kang, Ilseob Song et Yangmo Yoo. « Efficient Transmit Delay Calculation in Ultrasound Coherent Plane-Wave Compound Imaging for Curved Array Transducers ». Applied Sciences 9, no 13 (8 juillet 2019) : 2752. http://dx.doi.org/10.3390/app9132752.

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The recently introduced plane-wave compounding method based on multiple plane-wave excitation has enabled several new applications due to its high frame rate (>1000 Hz). In this paper, a new efficient transmit delay calculation method in plane-wave compound imaging for a curved array transducer is presented. In the proposed method, the transmit delay is only calculated for a steering angle of 0° and is shifted along the element of the transducer to obtain other transmit delays for different steering angles. To evaluate the performance of the proposed method, the computational complexity was measured for various transmission conditions. For the number of elements and plane-wave excitations of 128 and 65, respectively, the number of operations was substantially decreased in the proposed method compared with the conventional method (256 vs. 8320). The benefits of the proposed method were demonstrated with phantom and in vivo experiments, where coherent plane-wave compounding with 65 excitations provided larger CR and CNR values compared to nine excitations (−22.5 dB and 2.7 vs. −11.3 dB and 1.9, respectively). These results indicate the proposed method can effectively reduce the computational complexity for plane-wave compound imaging in curved array transducers.
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10

Sheina, Iryna V., et Eugen A. Barannik. « Resolution of the Ultrasound Doppler System Using Coherent Plane-Wave Compounding Technique ». 1, no 1 (17 mars 2022) : 116–22. http://dx.doi.org/10.26565/2312-4334-2022-1-16.

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In this work, in the process of plane-wave ultrasound probing from different angles the attainable spatial resolution was estimated on the basis of the previously developed theory of the Doppler response formation. In the theoretical calculations coherent compounding of the Doppler response signals was conducted over the period of changing the steering angles of probing. For this case an analytical expression for the ultrasound system sensitivity function over the field, which corresponds to the point spread function, is obtained. In the case of a rectangular weighting window for the response signals, the resolution is determined by the well-known sinc-function. The magnitude of the lateral resolution is inversely proportional to the range of the steering angles. It is shown that the theoretically estimated magnitude of the Doppler system lateral resolution, when using the technique of coherent plane-wave compounding, is in good agreement with the experimental data presented in literature.
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11

Wang, Yuanguo, Chichao Zheng, Hu Peng et Yadan Wang. « High-Quality Coherent Plane-Wave Compounding Using Enhanced Covariance-Matrix-Based Statistical Beamforming ». Applied Sciences 12, no 21 (29 octobre 2022) : 10973. http://dx.doi.org/10.3390/app122110973.

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Coherent plane-wave compounding (CPWC) enables high-frame-rate ultrasound imaging, but the imaging quality is mainly determined by the beamforming method. Covariance-matrix-based statistical beamforming (CMSB) was previously proposed for synthetic aperture ultrasound imaging, which provides notable improvements in resolution and contrast over conventional delay-and-sum (DAS). However, the speckle quality is inadequate in the phantom experiment, and there exists a tradeoff between the contrast and speckle preservation of CMSB due to the constant diagonal reducing factor. In this paper, we applied CMSB in CPWC ultrasound imaging and propose an enhanced CMSB approach for CPWC to enhance the image quality. First, we introduced lag-one coherence (LOC) as an adaptive weighting factor for CMSB to suppress incoherent noise. Then, we propose adaptive diagonal reducing for CMSB using the coherence factor and amplitude standard deviation, with the aim to further improve the speckle quality. Finally, the combination of LOC weighting and adaptive diagonal reducing is proposed for CMSB to simultaneously improve the contrast and speckle quality. A simulation, experiments, and carotid studies were used to validate the imaging performance of the proposed methods. Results from the experiments show that LOC-weighted CMSB (LOCw-CMSB) with adaptive diagonal reducing improves the average contrast, generalized contrast-to-noise ratio (gCNR), and speckle signal-to-noise ratio (sSNR) by 59.9%, 53.6%, and 77.7%, respectively, in comparison with DMAS. The contrast and sSNR of the LOCw-CMSB with adaptive diagonal reducing were improved by 32.3% and 33.1%, respectively, compared to CMSB. In addition, LOCw-CMSB with adaptive diagonal reducing improves the contrast by 176.6% compared with SLSC in the in vivo carotid study, while it obtains a comparable gCNR. These results demonstrate that the proposed methods are effective in improving the image quality of CPWC imaging.
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Feng, Shuai, Yadan Wang, Chichao Zheng, Zhihui Han et Hu Peng. « Neighborhood Singular Value Decomposition Filter and Application in Adaptive Beamforming for Coherent Plane-Wave Compounding ». Applied Sciences 10, no 16 (12 août 2020) : 5595. http://dx.doi.org/10.3390/app10165595.

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Coherent plane-wave compounding (CPWC) is widely used in medical ultrasound imaging, in which plane-waves tilted at multiple angles are used to reconstruct ultrasound images. CPWC helps to achieve a balance between frame rate and image quality. However, the image quality of CPWC is limited due to sidelobes and noise interferences. Filtering techniques and adaptive beamforming methods are commonly used to suppress noise and sidelobes. Here, we propose a neighborhood singular value decomposition (NSVD) filter to obtain high-quality images in CPWC. The NSVD filter is applied to adaptive beamforming by combining with adaptive weighting factors. The NSVD filter is advantageous because of its singular value decomposition (SVD) and smoothing filters, performing the SVD processing in neighboring regions while using a sliding rectangular window to filter the entire imaging region. We also tested the application of NSVD in adaptive beamforming. The NSVD filter was combined with short-lag spatial coherence (SLSC), coherence factor (CF), and generalized coherence factor (GCF) to enhance performances of adaptive beamforming methods. The proposed methods were evaluated using simulated and experimental datasets. We found that NSVD can suppress noise and achieve improved contrast (contrast ratio (CR), contrast-to-noise ratio (CNR) and generalized CNR (gCNR)) compared to CPWC. When the NSVD filter is used, adaptive weighting methods provide higher CR, CNR, gCNR and speckle signal-to-noise ratio (sSNR), indicating that NSVD is able to improve the imaging performance of adaptive beamforming in noise suppression and speckle pattern preservation.
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13

Cormack, John M., Marc A. Simon et Kang Kim. « Time-domain formulation for coherent plane wave compounding in horizontally layered media ». Journal of the Acoustical Society of America 151, no 4 (avril 2022) : A213. http://dx.doi.org/10.1121/10.0011086.

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The locations of origin of ultrasonic echoes from soft tissue in conventional ultrasound beamforming are based on measured time of flight. For simplicity it is usually assumed that the region of interest is homogeneous with a constant sound speed, but in many in vivo and benchtop applications the imaging region is composed of horizontal layers, each with a distinct sound speed. In addition to time-of-flight complications, sound speed differences between the layers result in refraction through the interface of both the transmitted pulse and those reflected from the tissue, further influencing the fidelity of beamforming for target localization or other quantitative ultrasound metrics. A formulation is presented for delay-and-sum coherent Plane Wave Compounding (PWC) that accounts for variation in sound speed and refraction of ultrasound pulses in a region with two horizontal layers. The algorithm is formulated completely in the time domain, enabling simple implementation or extension of existing homogeneous PWC algorithms. Simulated and experimental images are investigated for a typical two-layer benchtop configuration, where the sound speeds in the upper and lower layers are relatively slow (water or gel) and fast (muscle), respectively. Extension of the formulation to a medium with N distinct layers is discussed.
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14

Benane, Yanis Mehdi, Denis Bujoreanu, Roberto J. Lavarello, Francois Varray, Jean-Michel Escoffre, Anthony Novell, Christian Cachard et Olivier Basset. « Experimental Implementation of a Pulse Compression Technique Using Coherent Plane-Wave Compounding ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 65, no 6 (juin 2018) : 1025–36. http://dx.doi.org/10.1109/tuffc.2018.2820747.

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15

Palmer, Cameron Lowell, et Ole Marius Hoel Rindal. « Wireless, Real-Time Plane-Wave Coherent Compounding on an iPhone : A Feasibility Study ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 66, no 7 (juillet 2019) : 1222–31. http://dx.doi.org/10.1109/tuffc.2019.2914555.

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16

Montaldo, G., M. Tanter, J. Bercoff, N. Benech et M. Fink. « Coherent plane-wave compounding for very high frame rate ultrasonography and transient elastography ». IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 56, no 3 (mars 2009) : 489–506. http://dx.doi.org/10.1109/tuffc.2009.1067.

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Yan, Xin, et Yuanyuan Wang. « A submatrix spatial coherence approach to minimum variance beamforming combined with sign coherence factor for coherent plane wave compounding ». Technology and Health Care 30 (25 février 2022) : 11–25. http://dx.doi.org/10.3233/thc-228002.

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BACKGROUND: The coherent plane wave compounding (CPWC) is a promising technique to enhance the imaging quality while maintaining the high frame rate in the plane wave ultrasound imaging. Recently, the spatial-coherence-based method has been specially designed to process echo matrix required by the minimum variance (MV) method. OBJECTIVE: In this paper, a novel beamforming method that integrates the submatrix-spatial-coherence-based MV with the sign coherence factor (SCF) is proposed to further improve the imaging quality. METHOD: The submatrix smoothing technique is modified to smooth and de-correlate signals of the receiving array dimension. Then, the SCF is used to modify the input vector of the beamformer, which can reduce side lobe noises with almost no increase in the amount of calculation. Simulation, phantom, in vivo, and sound velocity error experiments have been performed to verify the superiority of the proposed beamformer. RESULTS: The imaging results show that the proposed approach performs better in the imaging resolution and contrast compared to the traditional CPWC method. CONCLUSION: The robustness of the proposed method is enhanced, and the over-suppression phenomenon can be alleviated, which is a phenomenon that occurs in the original spatial-coherence and SCF methods.
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Hashemseresht, Maryam, Sajjad Afrakhteh et Hamid Behnam. « High-resolution and high-contrast ultrafast ultrasound imaging using coherent plane wave adaptive compounding ». Biomedical Signal Processing and Control 73 (mars 2022) : 103446. http://dx.doi.org/10.1016/j.bspc.2021.103446.

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Denarie, B., T. A. Tangen, I. K. Ekroll, N. Rolim, H. Torp, T. Bjastad et L. Lovstakken. « Coherent Plane Wave Compounding for Very High Frame Rate Ultrasonography of Rapidly Moving Targets ». IEEE Transactions on Medical Imaging 32, no 7 (juillet 2013) : 1265–76. http://dx.doi.org/10.1109/tmi.2013.2255310.

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Chen, Chuan, Gijs A. G. M. Hendriks, Ruud J. G. van Sloun, Hendrik H. G. Hansen et Chris L. de Korte. « Improved Plane-Wave Ultrasound Beamforming by Incorporating Angular Weighting and Coherent Compounding in Fourier Domain ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 65, no 5 (mai 2018) : 749–65. http://dx.doi.org/10.1109/tuffc.2018.2811865.

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Toulemonde, Matthieu, Olivier Basset, Piero Tortoli et Christian Cachard. « Thomson’s multitaper approach combined with coherent plane-wave compounding to reduce speckle in ultrasound imaging ». Ultrasonics 56 (février 2015) : 390–98. http://dx.doi.org/10.1016/j.ultras.2014.09.006.

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Nicolet, Frank, Denis Bujoreanu, Ewen Carcreff, Hervé Liebgott, Denis Friboulet et Barbara Nicolas. « Simultaneous Coded Plane-Wave Imaging Using an Advanced Ultrasound Forward Model ». Applied Sciences 12, no 24 (13 décembre 2022) : 12809. http://dx.doi.org/10.3390/app122412809.

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In the quest for higher acquisition rates of ultrasound images, the simultaneous emission of encoded waves has the potential to overcome the trade-off between acquisition time and image quality. However, the lack of fully orthogonal codes has led to the use of forward models and inverse problem approaches to estimate the imaged medium. Nonetheless, due to some simplifying assumptions on which these models rely, the previously stated trade-off still appears in these acquisition/reconstruction schemes. In this paper, a forward model for ultrasound wave propagation inside a scattering medium is developed for the simultaneous coded emission of plane waves. The tissue reflectivity function of the imaged medium is estimated by solving an ℓ1-regularized version of the corresponding inverse problem. The proposed method is evaluated in silico and in vitro. We demonstrate that this method outperforms the conventional technique that consists of successive emissions of plane waves, reconstruction using delay and sum (DAS), and coherent compounding. In silico, the ability to separate close scatterers is improved by a factor of four in the axial direction and by a factor of 2.5 in the lateral direction. In vitro, the spatial resolution at −6 dB is decreased by a factor of seven. These results suggest that the proposed method could be a valuable tool, particularly for ultrasound imaging of sparse mediums such as in ultrasound localization microscopy.
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Zheng, Chichao, Hao Wang, Xiang Xu, Hu Peng et Qiang Chen. « An adaptive imaging method for ultrasound coherent plane-wave compounding based on the subarray zero-cross factor ». Ultrasonics 100 (janvier 2020) : 105978. http://dx.doi.org/10.1016/j.ultras.2019.105978.

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Nguyen, Nghia Q., et Richard W. Prager. « A Spatial Coherence Approach to Minimum Variance Beamforming for Plane-Wave Compounding ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 65, no 4 (avril 2018) : 522–34. http://dx.doi.org/10.1109/tuffc.2018.2793580.

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Shen, Che-Chou, et Yen-Chen Chu. « DMAS Beamforming with Complementary Subset Transmit for Ultrasound Coherence-Based Power Doppler Detection in Multi-Angle Plane-Wave Imaging ». Sensors 21, no 14 (16 juillet 2021) : 4856. http://dx.doi.org/10.3390/s21144856.

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Conventional ultrasonic coherent plane-wave (PW) compounding corresponds to Delay-and-Sum (DAS) beamforming of low-resolution images from distinct PW transmit angles. Nonetheless, the trade-off between the level of clutter artifacts and the number of PW transmit angle may compromise the image quality in ultrafast acquisition. Delay-Multiply-and-Sum (DMAS) beamforming in the dimension of PW transmit angle is capable of suppressing clutter interference and is readily compatible with the conventional method. In DMAS, a tunable p value is used to modulate the signal coherence estimated from the low-resolution images to produce the final high-resolution output and does not require huge memory allocation to record all the received channel data in multi-angle PW imaging. In this study, DMAS beamforming is used to construct a novel coherence-based power Doppler detection together with the complementary subset transmit (CST) technique to further reduce the noise level. For p = 2.0 as an example, simulation results indicate that the DMAS beamforming alone can improve the Doppler SNR by 8.2 dB compared to DAS counterpart. Another 6-dB increase in Doppler SNR can be further obtained when the CST technique is combined with DMAS beamforming with sufficient ensemble averaging. The CST technique can also be performed with DAS beamforming, though the improvement in Doppler SNR and CNR is relatively minor. Experimental results also agree with the simulations. Nonetheless, since the DMAS beamforming involves multiplicative operation, clutter filtering in the ensemble direction has to be performed on the low-resolution images before DMAS to remove the stationary tissue without coupling from the flow signal.
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Shen, Che-Chou, et Feng-Ting Guo. « Ultrasound Ultrafast Power Doppler Imaging with High Signal-to-Noise Ratio by Temporal Multiply-and-Sum (TMAS) Autocorrelation ». Sensors 22, no 21 (31 octobre 2022) : 8349. http://dx.doi.org/10.3390/s22218349.

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Coherent plane wave compounding (CPWC) reconstructs transmit focusing by coherently summing several low-resolution plane-wave (PW) images from different transmit angles to improve its image resolution and quality. The high frame rate of CPWC imaging enables a much larger number of Doppler ensembles such that the Doppler estimation of blood flow becomes more reliable. Due to the unfocused PW transmission, however, one major limitation of the Doppler estimation in CPWC imaging is the relatively low signal-to-noise ratio (SNR). Conventionally, the Doppler power is estimated by a zero-lag autocorrelation which reduces the noise variance, but not the noise level. A higher-lag autocorrelation method such as the first-lag (R(1)) power Doppler image has been developed to take advantage of the signal coherence in the temporal direction for suppressing uncorrelated random noises. In this paper, we propose a novel Temporal Multiply-and-Sum (TMAS) power Doppler detection method to further improve the noise suppression of the higher-lag method by modulating the signal coherence among the temporal correlation pairs in the higher-lag autocorrelation with a tunable pt value. Unlike the adaptive beamforming methods which demand for either receive–channel–domain or transmit–domain processing to exploit the spatial coherence of the blood flow signal, the proposed TMAS power Doppler can share the routine beamforming architecture with CPWC imaging. The simulated results show that when it is compared to the original R(1) counterpart, the TMAS power Doppler image with the pt value of 2.5 significantly improves the SNR by 8 dB for the cross-view flow velocity within the Nyquist rate. The TMAS power Doppler, however, suffers from the signal decorrelation of the blood flow, and thus, it relies on not only the pt value and the flow velocity, but also the flow direction relative to the geometry of acoustic beam. The experimental results in the flow phantom and in vivo dataset also agree with the simulations.
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Qi, Yanxing, Yuanyuan Wang, Jinhua Yu et Yi Guo. « 2-D Minimum Variance Based Plane Wave Compounding with Generalized Coherence Factor in Ultrafast Ultrasound Imaging ». Sensors 18, no 12 (23 novembre 2018) : 4099. http://dx.doi.org/10.3390/s18124099.

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Plane wave compounding (PWC) is an effective modality for ultrafast ultrasound imaging. It can provide higher resolution and better noise reduction than plane wave imaging (PWI). In this paper, a novel beamformer integrating the two-dimensional (2-D) minimum variance (MV) with the generalized coherence factor (GCF) is proposed to maintain the high resolution and contrast along with a high frame rate for PWC. To specify, MV beamforming is adopted in both the transmitting aperture and the receiving one. The subarray technique is therefore upgraded into the sub-matrix division. Then, the output of each submatrix is used to adaptively compute the GCF using a 2-D fast Fourier transform (FFT). After the 2-D MV beamforming and the 2-D GCF weighting, the final output can be obtained. Results of simulations, phantom experiments, and in vivo studies confirm the advantages of the proposed method. Compared with the delay-and-sum (DAS) beamformer, the full width at half maximum (FWHM) is 90% smaller and the contrast ratio (CR) improvement is 154% in simulations. The over-suppression of desired signals, which is a typical drawback of the coherence factor (CF), can be effectively avoided. The robustness against sound velocity errors is also enhanced.
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Kou, Zhengchang, et Michael L. Oelze. « Sidelobe reduction using null subtraction imaging ». Journal of the Acoustical Society of America 151, no 4 (avril 2022) : A214. http://dx.doi.org/10.1121/10.0011087.

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In this work, we propose a novel anodization scheme where three different apodizations are introduced to create three separate images that are then combined nonlinearly to produce better image quality, i.e., null subtraction imaging (NSI). All apodizations were on receive only. The first apodization consisted of a zero mean weighting with the left half of aperture a weight of + 1 and the right half of aperture a weight of −1. The second apodization was a DC offset version of the first apodization and the third apodization was a flipped version of the second. Images were created by combining the envelope signals of three apodizations with different weights. The images were subtracted from one another resulting in a reduction in sidelobe levels, a narrowing of the main lobe and improvement in image quality. An L14-5 array transducer and a Verasonics system were used to capture the RF channel data using seven plane waves spanning angles between −12° and 12°. Both coherent compounding and filtered incoherent compounding were used as a tradeoff between lateral resolution and contrast to noise ratio (CNR). Images were constructed from wire targets, a tissue-mimicking phantom, and rat tumors in vivo. Image quality was assessed through the CNR and intensity of sidelobes visible in the images. Images created using NSI were compared to images created using Hanning apodization with delay and sum (DAS) and a generalized coherence factor (GCF) approach. Improvements in image quality were found when using NSI compared to the other methods.
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Luo, Lin, Yuanhao Tan, Jinlong Li, Yu Zhang et Xiaorong Gao. « Wedge two-layer medium ultrasonic plane wave compounding imaging based on sign multiply coherence factor combined with delay multiply and sum beamforming ». NDT & ; E International 127 (avril 2022) : 102601. http://dx.doi.org/10.1016/j.ndteint.2021.102601.

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Hansen, H. H. G., A. E. C. M. Saris, N. R. Vaka, M. M. Nillesen et C. L. de Korte. « Ultrafast vascular strain compounding using plane wave transmission ». Journal of Biomechanics 47, no 4 (mars 2014) : 815–23. http://dx.doi.org/10.1016/j.jbiomech.2014.01.015.

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Li, Pai-Chi, et M. O'Donnell. « Elevational Spatial Compounding ». Ultrasonic Imaging 16, no 3 (juillet 1994) : 176–89. http://dx.doi.org/10.1177/016173469401600303.

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Spatial compounding has long been explored to reduce coherent speckle noise in medical ultrasound. By laterally translating a one-dimensional array, partially correlated measurements made at different look directions can be obtained and incoherently averaged. The lateral resolution, however, is limited by the sub-array length used for each independent measurement. To reduce speckle contrast without compromising lateral resolution, a new spatial compounding technique using two-dimensional, anisotropic arrays is proposed. This technique obtains partially correlated measurements by steering the image plane elevationally with small inclinations. Incoherent averaging is then performed by adding image magnitudes. Therefore, contrast resolution is improved only at the price of a slightly wider elevational beam. Note that although anisotropic arrays have limited steering capability in elevation, grating lobes are not considered influential since only small inclinations are needed between measurements. Simulations have been performed to show both the change in spatial resolution and the improvement in contrast resolution. Results indicated minimal increase in the correlation length both laterally and axially. It was also shown that detectability can be significantly enhanced by increasing the number of measurements or increasing the differential inclination between measurements. This technique is therefore effective for reducing speckle noise while maintaining in-plane spatial resolution. Furthermore, it demonstrates a new application of two-dimensional anisotropic arrays in spite of their limited elevational steering capability.
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Qi, Yanxing, Yinmeng Wang et Yuanyuan Wang. « United Wiener postfilter for plane wave compounding ultrasound imaging ». Ultrasonics 113 (mai 2021) : 106373. http://dx.doi.org/10.1016/j.ultras.2021.106373.

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Gasse, Maxime, Fabien Millioz, Emmanuel Roux, Damien Garcia, Herve Liebgott et Denis Friboulet. « High-Quality Plane Wave Compounding Using Convolutional Neural Networks ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 64, no 10 (octobre 2017) : 1637–39. http://dx.doi.org/10.1109/tuffc.2017.2736890.

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Apostolakis, Iason Zacharias, Matthew D. J. McGarry, Ethan A. Bunting et Elisa E. Konofagou. « Pulse wave imaging using coherent compounding in a phantom andin vivo ». Physics in Medicine and Biology 62, no 5 (6 février 2017) : 1700–1730. http://dx.doi.org/10.1088/1361-6560/aa553a.

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Zhao, Jinxin, Yuanyuan Wang, Xing Zeng, Jinhua Yu, Billy Y. S. Yiu et Alfred C. H. Yu. « Plane wave compounding based on a joint transmitting-receiving adaptive beamformer ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 62, no 8 (août 2015) : 1440–52. http://dx.doi.org/10.1109/tuffc.2014.006934.

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Capriotti, Margherita, James Greenleaf et Matthew W. Urban. « A time-aligned plane wave compounding method for high frame rate shear wave elastography ». Journal of the Acoustical Society of America 148, no 4 (octobre 2020) : 2447. http://dx.doi.org/10.1121/1.5146752.

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Lee, Hyoung-Ki, James F. Greenleaf et Matthew W. Urban. « A New Plane Wave Compounding Scheme Using Phase Compensation for Motion Detection ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 69, no 2 (février 2022) : 702–10. http://dx.doi.org/10.1109/tuffc.2021.3136127.

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38

Salles, Sebastien, Hervé Liebgott, Olivier Basset, Christian Cachard, Didier Vray et Roberto Lavarello. « Experimental evaluation of spectral-based quantitative ultrasound imaging using plane wave compounding ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 61, no 11 (novembre 2014) : 1824–34. http://dx.doi.org/10.1109/tuffc.2014.006543.

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39

Guo, Wei, Yanxing Qi, Yuanyuan Wang et Jinhua Yu. « Enhanced Plane Wave Compounding with Fewer Transmissions Based on the Envelope Statistics ». Journal of Medical Imaging and Health Informatics 8, no 8 (1 octobre 2018) : 1690–98. http://dx.doi.org/10.1166/jmihi.2018.2494.

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Holländer, Branislav, Gijs A. G. M. Hendriks, Ritse M. Mann, Hendrik H. G. Hansen et Chris L. de Korte. « Plane-Wave Compounding in Automated Breast Volume Scanning : A Phantom-Based Study ». Ultrasound in Medicine & ; Biology 42, no 10 (octobre 2016) : 2493–503. http://dx.doi.org/10.1016/j.ultrasmedbio.2016.05.017.

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41

Lajunen, Hanna, Jani Tervo et Pasi Vahimaa. « Overall coherence and coherent-mode expansion of spectrally partially coherent plane-wave pulses ». Journal of the Optical Society of America A 21, no 11 (1 novembre 2004) : 2117. http://dx.doi.org/10.1364/josaa.21.002117.

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42

Yiu, B. Y. S., I. K. H. Tsang et A. C. H. Yu. « GPU-based beamformer : Fast realization of plane wave compounding and synthetic aperture imaging ». IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 58, no 8 (août 2011) : 1698–705. http://dx.doi.org/10.1109/tuffc.2011.1999.

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43

Lancis, Jesús, Víctor Torres-Company, Enrique Silvestre et Pedro Andrés. « Space–time analogy for partially coherent plane-wave-type pulses ». Optics Letters 30, no 22 (15 novembre 2005) : 2973. http://dx.doi.org/10.1364/ol.30.002973.

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44

Schwab, Hans-Martin, et Richard Lopata. « A Radon diffraction theorem for plane wave ultrasound imaging ». Journal of the Acoustical Society of America 153, no 2 (février 2023) : 1015–26. http://dx.doi.org/10.1121/10.0017245.

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The rising demand on high frame rate ultrasound imaging applications necessitates the development of fast algorithms for plane wave image reconstruction. We introduce a new class of plane wave reconstructions that relies on a relation between receive data and image data in the Radon domain. This relation is derived for arbitrary dimensions and validated on multiple two-dimensional plane wave data sets. We further present a mathematical relation between conventional delay-and-sum and Fourier domain reconstruction methods and the method proposed. Our analysis shows that they all rely on the same physical model with slight variations in certain filtering steps and, therefore, the new Radon domain reconstruction yields similar results as other methods in terms of image quality. However, we show that our method offers a huge potential to improve computation time by reducing the number of applied projections and to improve image quality by introducing nonlinear operations in the Radon domain, e.g., for edge enhancement. As the Radon transform retains both angular and temporal information, the relation also provides new insights on the fundamentals of plane wave imaging that can be leveraged for optimizing acquisition schemes or for developing novel compounding strategies in the future.
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45

Constantinou, Navid C., Brian F. Farrell et Petros J. Ioannou. « Statistical State Dynamics of Jet–Wave Coexistence in Barotropic Beta-Plane Turbulence ». Journal of the Atmospheric Sciences 73, no 5 (1 mai 2016) : 2229–53. http://dx.doi.org/10.1175/jas-d-15-0288.1.

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Abstract Jets coexist with planetary-scale waves in the turbulence of planetary atmospheres. The coherent component of these structures arises from cooperative interaction between the coherent structures and the incoherent small-scale turbulence in which they are embedded. It follows that theoretical understanding of the dynamics of jets and planetary-scale waves requires adopting the perspective of statistical state dynamics (SSD), which comprises the dynamics of the interaction between coherent and incoherent components in the turbulent state. In this work, the stochastic structural stability theory (S3T) implementation of SSD for barotropic beta-plane turbulence is used to develop a theory for the jet–wave coexistence regime by separating the coherent motions consisting of the zonal jets together with a selection of large-scale waves from the smaller-scale motions that constitute the incoherent component. It is found that mean flow–turbulence interaction gives rise to jets that coexist with large-scale coherent waves in a synergistic manner. Large-scale waves that would exist only as damped modes in the laminar jet are found to be transformed into exponentially growing waves by interaction with the incoherent small-scale turbulence, which results in a change in the mode structure, allowing the mode to tap the energy of the mean jet. This mechanism of destabilization differs fundamentally and serves to augment the more familiar S3T instabilities in which jets and waves arise from homogeneous turbulence with the energy source exclusively from the incoherent eddy field and provides further insight into the cooperative dynamics of the jet–wave coexistence regime in planetary turbulence.
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Hendriks, Gijs A. G. M., Hendrik H. G. Hansen, Chuan Chen et Chris L. De Korte. « Optimization of transmission and reconstruction parameters in angular displacement compounding using plane wave ultrasound ». Physics in Medicine & ; Biology 65, no 8 (21 avril 2020) : 085007. http://dx.doi.org/10.1088/1361-6560/ab7b2f.

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47

Yan, Xin, Yanxing Qi, Yinmeng Wang et Yuanyuan Wang. « High Resolution, High Contrast Beamformer Using Minimum Variance and Plane Wave Nonlinear Compounding with Low Complexity ». Sensors 21, no 2 (8 janvier 2021) : 394. http://dx.doi.org/10.3390/s21020394.

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The plane wave compounding (PWC) is a promising modality to improve the imaging quality and maintain the high frame rate for ultrafast ultrasound imaging. In this paper, a novel beamforming method is proposed to achieve higher resolution and contrast with low complexity. A minimum variance (MV) weight calculated by the partial generalized sidelobe canceler is adopted to beamform the receiving array signals. The dimension reduction technique is introduced to project the data into lower dimensional space, which also contributes to a large subarray length. Estimation of multi-wave receiving covariance matrix is performed and then utilized to determine only one weight. Afterwards, a fast second-order reformulation of the delay multiply and sum (DMAS) is developed as nonlinear compounding to composite the beamforming output of multiple transmissions. Simulations, phantom, in vivo, and robustness experiments were carried out to evaluate the performance of the proposed method. Compared with the delay and sum (DAS) beamformer, the proposed method achieved 86.3% narrower main lobe width and 112% higher contrast ratio in simulations. The robustness to the channel noise of the proposed method is effectively enhanced at the same time. Furthermore, it maintains a linear computational complexity, which means that it has the potential to be implemented for real-time response.
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48

Yan, Xin, Yanxing Qi, Yinmeng Wang et Yuanyuan Wang. « High Resolution, High Contrast Beamformer Using Minimum Variance and Plane Wave Nonlinear Compounding with Low Complexity ». Sensors 21, no 2 (8 janvier 2021) : 394. http://dx.doi.org/10.3390/s21020394.

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The plane wave compounding (PWC) is a promising modality to improve the imaging quality and maintain the high frame rate for ultrafast ultrasound imaging. In this paper, a novel beamforming method is proposed to achieve higher resolution and contrast with low complexity. A minimum variance (MV) weight calculated by the partial generalized sidelobe canceler is adopted to beamform the receiving array signals. The dimension reduction technique is introduced to project the data into lower dimensional space, which also contributes to a large subarray length. Estimation of multi-wave receiving covariance matrix is performed and then utilized to determine only one weight. Afterwards, a fast second-order reformulation of the delay multiply and sum (DMAS) is developed as nonlinear compounding to composite the beamforming output of multiple transmissions. Simulations, phantom, in vivo, and robustness experiments were carried out to evaluate the performance of the proposed method. Compared with the delay and sum (DAS) beamformer, the proposed method achieved 86.3% narrower main lobe width and 112% higher contrast ratio in simulations. The robustness to the channel noise of the proposed method is effectively enhanced at the same time. Furthermore, it maintains a linear computational complexity, which means that it has the potential to be implemented for real-time response.
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49

Hillion, Pierre. « COHERENT FIELD APPROXIMATION OF PLANE WAVE SCATTERING FROM 1D-ROUGH MIRRORS ». Progress In Electromagnetics Research M 11 (2010) : 177–90. http://dx.doi.org/10.2528/pierm09011202.

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50

Poree, Jonathan, Damien Garcia, Boris Chayer, Jacques Ohayon et Guy Cloutier. « Noninvasive Vascular Elastography With Plane Strain Incompressibility Assumption Using Ultrafast Coherent Compound Plane Wave Imaging ». IEEE Transactions on Medical Imaging 34, no 12 (décembre 2015) : 2618–31. http://dx.doi.org/10.1109/tmi.2015.2450992.

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