Ultrasonics最新文献

{"title":"Miniaturized drive and operational stability of ultrasonic micromotors: A study based on self-oscillating technology","authors":"Yiwei Zhang ,&nbsp;Yu Chen ,&nbsp;Wentao Zhang ,&nbsp;Tianyu Yang ,&nbsp;Pingyi Jia ,&nbsp;Yelong Zheng","doi":"10.1016/j.ultras.2025.107765","DOIUrl":"10.1016/j.ultras.2025.107765","url":null,"abstract":"<div><div>Ultrasonic micromotors, characterized by their compact size, high speed, and high accuracy, are promising actuators for minimally invasive surgical tools and other space-constrained precision systems. However, their application is hindered by bulky drive circuits and resonance drift during prolonged operation. To address these challenges, this paper focuses on capacitive micromotors with resonance frequencies exceeding 100 kHz and proposes a novel miniature drive system based on self-oscillating technology. The motor is integrated into the feedback loop, achieving a compact design that unifies signal generation, signal amplification, and real-time dynamic frequency tracking. Furthermore, this study investigates the fundamental mechanism of resonance frequency shift in ultrasonic motors and the frequency tracking principle of self-oscillating circuits. During prolonged operation, the motor experiences power loss, resulting in temperature rise and changes in material properties, which ultimately cause resonance frequency drift. The self-oscillating circuit effectively tracks these frequency variations through a feedback mechanism, maintaining system stability and reliable performance. Experimental results demonstrate that the proposed system achieves effective frequency tracking with a maximum deviation of 0.20 kHz and a maximum relative deviation of 0.15%. The system, with dimensions of <span><math><mrow><mn>15</mn><mspace></mspace><mtext>mm</mtext><mo>×</mo><mn>12</mn><mspace></mspace><mtext>mm</mtext><mo>×</mo><mn>0</mn><mo>.</mo><mn>6</mn><mspace></mspace><mtext>mm</mtext></mrow></math></span>, operates at a 10 V power supply, delivering a 5 V peak-to-peak output with 14 mA current and 24.88 mW power. It achieves a maximum speed of 6300.20 rpm and a holding torque of 14.59 <span><math><mi>μ</mi></math></span>N m with a high linearity torque–voltage relationship (<span><math><mrow><msubsup><mrow><mi>R</mi></mrow><mrow><mi>T</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>=</mo><mn>0</mn><mo>.</mo><mn>9998</mn></mrow></math></span>). This study significantly advances the development of compact drive systems, enabling ultrasonic micromotors to operate reliably in space-constrained environments.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"156 ","pages":"Article 107765"},"PeriodicalIF":3.8,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144679676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Confidence-enhanced flow trajectory imaging using speckle tracking with multi-angle plane waves","authors":"Bao-Yu Hsieh ,&nbsp;Mo-Han Lin ,&nbsp;Ching-Yao Lu ,&nbsp;Po-Syun Chen ,&nbsp;Yu-Chieh Jill Kao ,&nbsp;Wen-Hui Chan ,&nbsp;Sung-Yu Chu ,&nbsp;Geng-Shi Jeng","doi":"10.1016/j.ultras.2025.107760","DOIUrl":"10.1016/j.ultras.2025.107760","url":null,"abstract":"<div><div>Flow trajectory imaging, which tracks flow particles over time to map path-dependent trajectories, is a valuable tool for analyzing flow dynamics in pathological vascular conditions. Accurate trajectory estimation depends on robust vector flow imaging (VFI) methods to minimize cumulative errors. However, Doppler-based VFI methods are limited by aliasing and ensemble-sensitive estimation errors, while speckle tracking (ST) methods suffer from poor lateral velocity estimation due to beam diffraction. Additionally, existing trajectory imaging techniques lack a confidence metric to address unreliable estimates, leading to error propagation. To overcome these limitations, we propose a novel ST-based VFI technique leveraging multi-angle ultrafast plane wave imaging. Projected axial velocity components are estimated from baseband beamformed data for each steered plane wave and combined using a normalized cross-correlation (NCC)-weighted least-squares approach to generate velocity vectors. To ensure robust trajectory estimation, peak NCC values are incorporated to discard unreliable estimates and enhance confidence in the results. Simulation and experimental results demonstrate that the proposed method outperforms conventional ST and autocorrelation-based VFI by at least threefold and twofold in bias and standard deviation, respectively. It also shows better performance at low signal-to-noise ratios. <em>In vivo</em> measurements of the right carotid artery over one cardiac cycle highlight the ability of our method to visualize dynamic flow patterns and provide more accurate flow trajectory estimation compared to existing Doppler- and ST-based methods.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"156 ","pages":"Article 107760"},"PeriodicalIF":3.8,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal design and experimental study on a novel relaxor ferroelectric single crystal transducer based on face shear vibration mode","authors":"Sanrui Wu ,&nbsp;Yihang Xie ,&nbsp;Fushi Bai ,&nbsp;Duo Teng","doi":"10.1016/j.ultras.2025.107763","DOIUrl":"10.1016/j.ultras.2025.107763","url":null,"abstract":"<div><div>The underwater acoustic transducer is an important component of underwater sonar detection equipment, but it has constraints in terms of wide bandwidth and small size. [011] The polarization direction and zxt-45° cut PMN-PT single crystal have the characteristics of high shear piezoelectric strain constant, high electromechanical coupling coefficient and high compliance coefficient. These advantages provide ideas for breaking through the limitations of traditional transducers in terms of wide bandwidth and small size. This paper mainly uses the face shear vibration mode of the single crystal and adopts the method of face shear vibration and longitudinal vibration coupling to broaden the working frequency band. First, the influence of structural parameters on the vibration mode and resonant frequency of each order mode is studied utilizing finite element simulation analysis. Secondly, the NSGA-Ⅱ optimization algorithm and the finite element method are used to optimize the face shear mode broadband transducer designed in this paper. Finally, a face shear single crystal longitudinal vibration transducer prototype was made and tested and analyzed. The transducer has an outer diameter of 75 mm, a length of 36 mm, an operating frequency band of 7 kHz–60 kHz, a maximum transmission voltage response of 127 dB, and an in-band transmission voltage response fluctuation of less than 4.6 dB. Therefore, the use of a new face shear mode is conducive to achieving small size, high power and broadband emission of the underwater acoustic transducer.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"156 ","pages":"Article 107763"},"PeriodicalIF":3.8,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel optimization method for transducer array in Lamb wave detection of variable cross-section structures","authors":"Ziwei Fang ,&nbsp;Chenjun Gao ,&nbsp;Xuefei Guan ,&nbsp;Jingjing He ,&nbsp;Jing Lin","doi":"10.1016/j.ultras.2025.107764","DOIUrl":"10.1016/j.ultras.2025.107764","url":null,"abstract":"<div><div>Structures with complex cross-sections are widely applied in aerospace manufacturing and developing a Lamb wave-based structural health monitoring method for the structure has attracted interest. However, the complex nature of geometry makes dispersion calculation and transducers arrangement difficult. The variation in the thickness of the structural cross-section gives rise to disparities in the group velocity of Lamb waves. Consequently, the wave propagation leads to an uneven distribution of energy, which poses challenges for the applications of structural health monitoring (SHM). Although traditional phased arrays can be employed to address the issue of energy focusing, the implementation often complicates the in-situ monitoring process and consequently increases the associated costs. This article presents an efficient optimization method for flexible transducer array placement of Lamb wave detection. A real titanium alloy engine fan blade is employed to demonstrate and validate the proposed method. For better Lamb wave detection performance without cumbersome large-scale random sampling in array layout, the moment quadrature method is introduced to generate representative sparse samples for simulation. The process of the semi-analytical finite element (SAFE) method, which is improved by continuous cross-sections mapping, is conducted to analyze Lamb wave dispersion and select the desired mode. The dynamic simulation is employed to study the wave motion, especially the effects of optimized parameters on wave focusing. The simulation results are applied to build a polynomial model of focused energy and further obtain the optimized schemes for transducers arrangement. Validations in both simulations and experiments are performed to verify the performance of the proposed method.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"156 ","pages":"Article 107764"},"PeriodicalIF":3.8,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diagnostic imaging for damage detection in plates based on topological acoustic (TA) sensing technique","authors":"Bo Hu ,&nbsp;Tribikram Kundu ,&nbsp;Pierre A. Deymier ,&nbsp;Keith Runge","doi":"10.1016/j.ultras.2025.107750","DOIUrl":"10.1016/j.ultras.2025.107750","url":null,"abstract":"<div><div>Traditional structural damage detection methods in aerospace applications face challenges in accuracy and sensitivity, often necessitating multiple sensors to evaluate various measurement paths between the reference and defective states. However, the recently developed topological acoustic (TA) sensing technique can capture shifts in the geometric phase of an acoustic field, enabling the detection of even minor perturbations in the supporting medium. In this study, a diagnostic imaging method for damage detection in plate structures based on the TA sensing technique is presented. The method extracts the geometric phase shift index (GPS-I) from the Lamb wave response signals to indicate the location of the damage. Using Abaqus/CAE, a finite element model of the plate was established to simulate the Lamb wave response signals, which were then used to validate the feasibility of the proposed method. The results indicate that this technique enables rapid and precise identification of damage and its location within the plate structure, requiring response signals from only a few points on the damaged plate, and it is reference-free.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"156 ","pages":"Article 107750"},"PeriodicalIF":3.8,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adversarial learning for beamforming domain transfer in ultrasound medical imaging","authors":"Silvia Seoni ,&nbsp;Massimo Salvi ,&nbsp;Giulia Matrone ,&nbsp;Francesco Lapia ,&nbsp;Chiara Busso ,&nbsp;Marco A. Minetto ,&nbsp;Kristen M. Meiburger","doi":"10.1016/j.ultras.2025.107749","DOIUrl":"10.1016/j.ultras.2025.107749","url":null,"abstract":"<div><div>Beamforming, the process of reconstructing B-mode images from raw radiofrequency (RF) data, significantly influences ultrasound image quality. While advanced beamforming methods aim to enhance the traditional Delay and Sum (DAS) technique, they require access to raw RF data, which is often unavailable to researchers when using clinical ultrasound scanners. Given that Filtered Delay Multiply and Sum (F-DMAS) is known to provide superior image quality compared to conventional DAS, this study introduces the idea of employing generative adversarial networks (GANs) that transform plane wave DAS images into ones resembling those produced by F-DMAS. We validated the adversarial approach employing three different architectures (traditional Pix2Pix, Pyramidal Pix2Pix and CycleGAN) using full-reference metrics: Root Mean Square Error (RMSE) and Peak Signal-to-Noise Ratio (PSNR). We further propose employing a texture analysis to validate consistency between the generated images and target images, using 27 first-order and second-order parameters; contrast enhancement was evaluated using the Contrast Improvement Index (CII), and clinical relevance was determined through expert qualitative evaluation. The adversarial methods were also compared with traditional image enhancement methods, such as contrast limited adaptive histogram equalization (CLAHE) and histogram matching. The image similarity metrics between all methods were comparable, with the Pyramidal Pix2Pix GAN method showing the best values compared to traditional techniques and other generative models (PSNR = 18.0 ± 0.6 dB, RMSE = 0.126 ± 0.008). The texture features proved to be a clear discriminant between traditional methods and generative models, with values much closer to the target F-DMAS image for the generative models. All employed methods showed an improved contrast over original PW DAS images. A clinical evaluation was then employed to assess the contribution of the generated images compared to the original ones and to distinguish which generative model provided the best qualitative images. The proposed generative adversarial approach proves to be a viable option for enhancing B-mode ultrasound images when there is no access to raw RF data and demonstrates how texture features can be employed to validate deep learning generative models.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"156 ","pages":"Article 107749"},"PeriodicalIF":3.8,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acoustic vortex induced bubble cage: An on-demand light guide in turbid media","authors":"Zong-Han Hsieh ,&nbsp;Ching-Hsiang Fan ,&nbsp;Hsiu-Hui Tu ,&nbsp;Chia-Wen Hu ,&nbsp;Meng-Lin Li ,&nbsp;Chih-Kuang Yeh","doi":"10.1016/j.ultras.2025.107761","DOIUrl":"10.1016/j.ultras.2025.107761","url":null,"abstract":"<div><div>Guiding light in a scattering medium poses significant challenges, thus limiting the use of the optical device. We propose using an acoustic-vortex-induced bubble cage to confine light distribution within scattering media. The acoustic vortex creates a central null-pressure region surrounded by a high-pressure area, forming a ring-shaped bubble cage via cavitation. This structure acts as a light guide, confining photons within the central null during travel. Phantom experiments demonstrate a 50 % reduction in laser beam width and a 16.4 % ±1.0 % improvement in photon fluence. Effective photon confinement requires the laser beam width to match or be smaller than the central null width. It was also explored that a bubble cage acts as an optical lens, which can focus and steer photons. This technique offers reversible, on-demand, and non-contact photon manipulation in scattering mediums.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"156 ","pages":"Article 107761"},"PeriodicalIF":3.8,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of low-amplitude pulse interspersed with histotripsy treatment of Staphylococcus aureus biofilms on Surgical Mesh","authors":"Timothy A. Bigelow ,&nbsp;Andrew C. Petersen ,&nbsp;Dingiswayo A. Chikhwaza ,&nbsp;Huaiqing Wu ,&nbsp;Hongbo Yu ,&nbsp;Kalpana Gupta ,&nbsp;Kamal M.F. Itani","doi":"10.1016/j.ultras.2025.107730","DOIUrl":"10.1016/j.ultras.2025.107730","url":null,"abstract":"<div><div>Ultrasound histotripsy has shown great potential for destroying bacteria biofilms on hernia mesh. The therapy could be further enhanced by reducing the necessary treatment times. In this study, we evaluated the inclusion of a low-amplitude pulse spaced between each of the high-amplitude histotripsy pulses on the effectiveness of the therapy for different treatment durations. The low-amplitude pulse consisted of between 20 and 500 cycles at 1.05 MHz with rarefactional pressure amplitudes varying from 0 (no low-amplitude pulse) to −1.9 MPa. The scan speed was varied as 0.2 <span><math><mrow><mi>mm</mi><mo>/</mo><mi>s</mi></mrow></math></span>, 0.8 <span><math><mrow><mi>mm</mi><mo>/</mo><mi>s</mi></mrow></math></span>, and 1.5 <span><math><mrow><mi>mm</mi><mo>/</mo><mi>s</mi></mrow></math></span> (0.18 BW/<span><math><mi>s</mi></math></span>, 0.72 BW/<span><math><mi>s</mi></math></span>, 1.35 BW/<span><math><mi>s</mi></math></span> where BW is beamwidth). The step size between scan lines was 0.2 mm or 0.4 mm (0.18 BW and 0.36 BW). The pulse repetition frequency (PRF) was varied between 62.5 and 500 Hz with the low-amplitude pulses (if present) positioned <span><math><mrow><mn>500</mn><mspace></mspace><mi>μ</mi><mi>s</mi></mrow></math></span> after the histotripsy pulses. The number of colony-forming units on the mesh samples was significantly reduced when a low-amplitude pulse was included between the therapy pulses provided the mechanical index (MI) of the low-amplitude pulse exceeded 1.5. Slower scan speeds also increased biofilm destruction, but the effect was much less pronounced except for very slow scan speeds of 0.18 BW/<span><math><mi>s</mi></math></span>. Thus, the use of secondary pulses reduced treatment times from 20.9 <span><math><mrow><mi>min</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span> to 2.78 <span><math><mrow><mi>min</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>. Varying the PRF had no impact when the secondary pulse was not included, but biofilm destruction increased at higher PRFs when a secondary pulse was present. The number of cycles in the secondary pulse also had little impact over the range of values tested.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"156 ","pages":"Article 107730"},"PeriodicalIF":3.8,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrasonic-enhanced flocculation and sedimentation of lead-zinc tailings: mechanisms and efficiency improvements","authors":"Yong Shi ,&nbsp;Bokun Zheng ,&nbsp;Wei Lai ,&nbsp;Jia Sheng ,&nbsp;Liang Peng ,&nbsp;Hongning Qi ,&nbsp;Jian Zhou","doi":"10.1016/j.ultras.2025.107751","DOIUrl":"10.1016/j.ultras.2025.107751","url":null,"abstract":"<div><div>As global mining activities continue to increase, the accumulation of tailings presents significant environmental and social challenges. Traditional tailings treatment methods often struggle with efficiency and cost-effectiveness. Recently, ultrasonic technology has emerged as a novel and efficient approach, showing the potential to enhance the flocculation and sedimentation processes of mineral tailings. This study aims to investigate the mechanisms by which ultrasonic treatment enhances the flocculation of lead–zinc tailings. The research examines changes in particle properties, floc structure, and filter cake filtration performance of lead–zinc tailings under different flocculant systems before and after ultrasonic treatment. The results demonstrate that ultrasonic treatment significantly increases the contact angle of tailing particles, indicating enhanced surface hydrophobicity. Specifically, the contact angle increased from 52.0° in untreated tailings to a maximum of 66.5° after ultrasonic treatment with the addition of flocculants. Furthermore, zeta potential measurements reveal that the absolute value of the zeta potential decreased from −31.31 mV to −28.69 mV, −21.23 mV, and −14.59 mV after ultrasonic treatment with flocculants 02, 06, and 10 s, respectively, facilitating particle aggregation. Adsorption tests show increased flocculant adsorption on particle surfaces after ultrasonic treatment, promoting better flocculation. The ultrasonic treatment reduces the viscosity and surface tension of the filtrate, forming a more stable flocculation system and improving filtration efficiency. Moreover, the study found that ultrasonic treatment significantly increases the size and strength of flocs. These findings provide a comprehensive understanding of the interactions between tailing particles under ultrasonic action and offer valuable insights into the efficient treatment of tailings in mining operations.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"156 ","pages":"Article 107751"},"PeriodicalIF":3.8,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144579384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Specific Filtered Delay Multiply and Sum beamforming for coherent multi-transducer ultrasound imaging","authors":"Paul Dryburgh ,&nbsp;Daniele Mazierli ,&nbsp;Joseph V. Hajnal ,&nbsp;Piero Tortoli ,&nbsp;Alessandro Ramalli ,&nbsp;Laura Peralta","doi":"10.1016/j.ultras.2025.107731","DOIUrl":"10.1016/j.ultras.2025.107731","url":null,"abstract":"<div><div>Coherent multi-transducer ultrasound (CoMTUS) imaging enables the use of multiple arrays as one large effective aperture yielding images with enlarged field-of-view, improved resolution, and higher signal-to-noise ratio. However, creating a large but discontinuous effective aperture increases the grating and sidelobe levels, and generates cross-talk artifacts between arrays. These additional challenges can degrade the contrast of the images obtained through the classic Delay and Sum (DAS) beamforming algorithm.</div><div>This study investigates the possibility to improve contrast and reduce artifacts in CoMTUS by using an alternative nonlinear beamforming algorithm, the Filtered Delay Multiply and Sum (F-DMAS). We implemented a specific F-DMAS beamforming algorithm for CoMTUS considering the resulting effective aperture and tested its performance in a coherent dual-array system for 2-D imaging. The comparison between CoMTUS images obtained through F-DMAS and DAS was investigated by both simulations and experiments, including in vivo results. For a typical dual-probe configuration, CoMTUS specific F-DMAS was shown to be effective at lowering the sidelobes and the noise floor, resulting in better quality B-mode images with improved sidelobe suppression (first sidelobe amplitude decreased from -13.0 dB to -24.7 dB; side-lobe-to-main-lobe energy ratio decreased from 9.3 dB to 1.9 dB).</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"155 ","pages":"Article 107731"},"PeriodicalIF":3.8,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}