Ultrasonics最新文献

{"title":"Ultrasonic imaging of spherical solids embedded in ice.","authors":"Francesco Simonetti","doi":"10.1016/j.ultras.2025.107779","DOIUrl":"10.1016/j.ultras.2025.107779","url":null,"abstract":"<p><p>The transmission of compressional ultrasonic waves into a rigid and dense solid with a doubly-curved surface is impeded when the solid is placed in a liquid medium and its surface is irradiated with waves traveling through the liquid. Measurable power transmission is only possible when the incident ultrasonic beam is close to normal to the surface. This condition is difficult to realize when the waves are excited and detected by a linear array of transducers and limits the possibility of forming cross-sectional images of the solid from the array data. Here, it is shown that the interior of the solid can be imaged with enhanced fidelity if the water is frozen. The high speed of compressional waves in polycrystalline ice (approximately 4000 ms^-1) along with its rigid behavior ensure that ultrasonic waves can be transmitted through the surface over a broad range of angles of incidence. However, due to the double curvature, the rays that form the ultrasonic beam can be deflected outside the array azimuthal plane after entering the solid. Therefore, the two-dimensional images obtained from the linear array data may not be consistent with the fully three-dimensional structure of the ray paths. The analysis of this phenomenon for the special case of solid spheres reveals that the image, to a good approximation, corresponds to a section of the sphere that is parallel to the azimuthal plane and at a standoff distance from it. The distance increases with the angle that the normal to the surface forms relative to the azimuthal plane while it decreases as the velocity contrast between ice and the material of the sphere decreases. While this property is not expected to hold for more complex surfaces, the ray-based framework used in this study is applicable to more general surface configurations and can be used to correlate the images to the structure of the solid. These findings are relevant to the inspection of metallic components with complex geometry which represents a long-standing challenge in the field of nondestructive testing.</p>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"157 ","pages":"107779"},"PeriodicalIF":4.1,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144822733","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":"Genetic algorithm-enabled quantitative characterization of planar defect using local resonance frequency and attenuation.","authors":"Shuang Xu, Kai Wang, Honglin Yan, Wenxin Lai, Paixin Chen, Weibin Li, Ruiqi Guan, Hua Zhang, Kaixiang Gong","doi":"10.1016/j.ultras.2025.107780","DOIUrl":"10.1016/j.ultras.2025.107780","url":null,"abstract":"<p><p>Driven by the applications of advanced manufacturing technologies which enable complex designs, the nondestructive evaluation of damage in complex structures is playing an increasingly important role across various industries. The local defect resonance (LDR) has demonstrated greater applicability to defects in complex thin-walled structures than traditional methods. However, existing LDR-based methods suffer from the low accuracy in the quantitative evaluation of defect owing to the difficulty in determining the defect boundary. A method based on the frequency and attenuation of LDR is proposed in this investigation to quantify the diameter and thickness of circular defects simultaneously using the genetic algorithm. In this method, the reflections of guided ultrasonic waves at defect boundaries are analyzed using a normal mode expansion method, and thereby the relations between the FBH parameters (i.e., diameter and thickness) and LDR attributes (i.e., the frequency and attenuation rate) are obtained. On this basis, a method based on a genetic algorithm is proposed to inversely determine the defect parameters using the LDR attributes. The proposed method is validated through numerical investigation and experimental evaluations of a series of flat bottom holes in plate structures. The proposed method enhances the accuracy and efficiency for the quantitative evaluation of defects in complex structures, advancing the application of LDR-based nondestructive evaluation techniques and providing basis for developing structural health monitoring techniques using LDR.</p>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"157 ","pages":"107780"},"PeriodicalIF":4.1,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144817593","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":"Precise acoustic field establishment by holography-modulated acoustic intensity.","authors":"Hao Quan, Wei Zhou, Xinjia Li, Pengqi Li, Xiufang Liu, Fei Li, Lili Niu, Long Meng","doi":"10.1016/j.ultras.2025.107781","DOIUrl":"10.1016/j.ultras.2025.107781","url":null,"abstract":"<p><p>Acoustic holography, which reconstructs desired target acoustic fields by precisely controlling the phase distribution of acoustic wavefronts, holds significant promise for applications such as acoustic manipulation. However, the precise modulation of acoustic field distributions via acoustic holography to construct multifocal fields with controllable acoustic intensity ratios remains insufficiently explored. To address this limitation, this study proposes a Physics-Informed Artificial Intelligence-based Angular Spectrum method (AIAS), which deeply integrates the physical model of angular spectrum propagation into the neural network training process. Combined with a specifically designed Target-Area-Weighted Mean Squared Error loss function, AIAS establishes an explicit optimization link between the phase distribution and the amplitude error in the target region during the inverse design process. Results demonstrate that acoustic fields reconstructed by AIAS exhibit more concentrated and uniform pressure distributions (average pressure improved from 262 ± 15 kPa to 276.4 ± 5.6 kPa), providing stable acoustic fields for particle assembly. Importantly, by controlling the phase gradient distribution, AIAS successfully constructs asymmetric acoustic fields with a 2:1 intensity ratio between two focal points. The exceptional amplitude modulation capabilities of AIAS represent a key technological breakthrough for achieving more precise and personalized transcranial focused ultrasound therapy.</p>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"157 ","pages":"107781"},"PeriodicalIF":4.1,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144812477","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":"Noncontact pulsed laser-scanning laser Doppler vibrometer (PL-SLDV) phased array imaging for damage detection in composites.","authors":"Bowen Cai, Luyu Bo, Andrew Campbell, Jiali Li, Chongpeng Qiu, Hongye Liu, Lingyu Yu, Zhenhua Tian","doi":"10.1016/j.ultras.2025.107787","DOIUrl":"10.1016/j.ultras.2025.107787","url":null,"abstract":"<p><p>Guided wave phased arrays, which use multiple sensors in compact patterns to perform damage imaging through phase delays, have garnered significant interest for the rapid inspection of large composite panels. Previous phased arrays typically used large, wired ultrasonic transducers attached to composites, limiting array reconfigurability and preventing contactless inspection from a distance. This study presents a fully noncontact guided wave phased array imaging approach, which utilizes a dual laser-based guided wave generation and sensing system, namely a pulsed laser-scanning laser Doppler vibrometer (PL-SLDV) system, along with synthetic phased array beamforming and wavefield analysis. The PL-SLDV system employs a Q-switched PL module to generate nanosecond laser pulses that excite ultrasonic guided waves through the thermoelastic effect. To ensure consistent laser-to-ultrasound energy conversion across different composites and prevent potential thermal damage to composites, the laser pulses are directed onto a thin aluminum patch bonded on the composite. The SLDV acquires guided wave signals based on the Doppler effect, and its integrated galvo mirrors can quickly steer laser beam directions to scan a composite plate, thereby acquiring guided wave signals at various array points. Time/phase delays are then applied to the acquired signals through post-processing for synthetic phased array beamforming. To generate inspection images using the acquired wave signals, an improved delay-and-sum (DAS) imaging algorithm is introduced. It uses adaptive weighting factors and incorporates phase delay and back-propagation phase shift, accounting for the frequency- and direction-dependent dispersion relation, to overcome the dispersion effect and directional dependency of waves in anisotropic materials. Moreover, the fusion of phased array imaging and a wavefield analysis approach, which can extract frequency-wavenumber dispersion relations from experimental wavefields, enables our phased array method to perform damage imaging without requiring prior knowledge of composite properties, such as mechanical properties or theoretical dispersion curves. Additionally, the noncontact wave generation/acquisition feature of our PL-SLDV system allows for inspecting composites from a distance and easily constructing phased arrays with different patterns. Proof-of-concept experiments demonstrate that multiple defects in different directions can be successfully detected. Additionally, this study reveals that PL-generated guided waves can contain multiple modes, such as A₀, S₀, SH₀, A₁, S₁, and SH₁ modes, offering valuable insights for researchers interested in using PL-generated guided waves.</p>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"157 ","pages":"107787"},"PeriodicalIF":4.1,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144817594","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":"Dispersion characteristics and mode conversion of guided waves in plate-like structures with arbitrarily varying thickness.","authors":"Xudong Yu, Hao Zhou, Zijian Zhang, Rong Qin, Peng Zuo, Mingxi Deng","doi":"10.1016/j.ultras.2025.107862","DOIUrl":"https://doi.org/10.1016/j.ultras.2025.107862","url":null,"abstract":"<p><p>Understanding explicitly the dispersion and mode conversion of guided waves in plates with varying thickness is crucial for enhancing the accuracy of guided wave tomography. While prior studies have examined dispersion in such structures, a unified framework that links evolving dispersion characteristics and modal conversion with adiabatic wave theory for arbitrary thickness variations remains absent. In this study, we systematically analyse thickness-dependent dispersion in tapered, stepped, and arbitrarily varying plates using finite element (FE) simulation, semi-analytical finite element (SAFE) calculation, and experiment. Our results confirm that local frequency-thickness product (fd) governs dispersion, with higher-order guided wave modes emerging when fd exceeds each mode's cutoff. Symmetric thickness variations lead to intra-family conversions, while nonsymmetric configurations induce inter-family conversions. Moreover, we demonstrate that energy distribution among the converted guided wave modes strongly depends on the thickness gradient-gradual variations promote smooth, continuous energy transfer, whereas abrupt changes concentrate energy into fewer, higher-order modes. Finally, the introduction of a weighted time-distance mapping technique accurately compensates for dispersion effects, thereby validating our model. This work provides a solid foundation for future research on complex wave dynamics in structures with two-dimensional cross-sectional variations and advances guided wave tomography for engineering applications.</p>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"159 ","pages":"107862"},"PeriodicalIF":4.1,"publicationDate":"2025-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145356104","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 semi-analytical multimodal Lamb wave imaging algorithm for damage identification in structural health monitoring.","authors":"Zhengchen Dai, Jinxia Liu, Jianhai Zhang, Zhiwen Cui, Tribikram Kundu","doi":"10.1016/j.ultras.2025.107874","DOIUrl":"https://doi.org/10.1016/j.ultras.2025.107874","url":null,"abstract":"<p><p>Rapid damage identification in structural health monitoring (SHM) is critical for ensuring structural integrity and safety. Although Lamb waves exhibit high sensitivity to damages, quantitative correlation between multimodal time-of-flight (TOF) differences and damage parameters remains insufficiently explored. In this paper, we proposed an efficient damage identification algorithm based on multimodal Lamb wave TOF differences. The core of the method is a semi-analytical inversion model that reveals the relationship between the multimodal TOF differences and damage parameters. It provides a rapid way to obtain the residual thickness and length of the damage. Moving a transmitter-receiver pair is used to scan the whole detection area. The damage was located at the intersection of abnormal pathways. Dynamic baseline calibrationthrough DBSCAN clustering eliminates historical reference dependency while distinguishing damage paths. Tests on aluminum specimens show the range of localization and thickness accuracy. Simulations and experiments confirm its efficacy for identifying corrosion-type damage, demonstrating significant potential for cost-effective SHM deployment in large-scale structures.</p>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"159 ","pages":"107874"},"PeriodicalIF":4.1,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145356052","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 stochastic approach for calculating elastic constants of polymer lattice structures based on spectral ultrasonic data","authors":"Abdullah Al Masud ,&nbsp;Paul F Egan ,&nbsp;Jingfei Liu ,&nbsp;Karl A Fisher","doi":"10.1016/j.ultras.2025.107870","DOIUrl":"10.1016/j.ultras.2025.107870","url":null,"abstract":"<div><div>Additively manufactured polymer lattices are increasingly used in biomedical and structural applications due to their tunable mechanical properties and architectural similarity to biological materials. However, accurately resolving their anisotropic elastic response remains challenging due to fabrication inconsistencies, energy loss mechanisms, and differences between static and dynamic characterization techniques. In this study, a dynamic technique, resonant ultrasound spectroscopy (RUS) was applied to a stereolithography-fabricated body-centered tetragonal (BC-Tetra) lattice composed of a polyurethane-like resin. Elastic constants were extracted from both experimental and model (FEA) eigenfrequencies using a particle swarm optimization (PSO) scheme with modified parameter tuning to improve exploration of the non-convex inversion space. Comparison of inverted elastic tensors showed strong agreement for the axial stiffness,<span><math><mrow><mspace></mspace><msub><mi>C</mi><mn>33</mn></msub><mspace></mspace></mrow></math></span> and shear-related coefficients <span><math><mrow><mspace></mspace><msub><mi>C</mi><mn>44</mn></msub></mrow></math></span>​ and <span><math><mrow><mspace></mspace><msub><mi>C</mi><mn>66</mn></msub></mrow></math></span>, , while in-plane stiffness constants <span><math><mrow><mspace></mspace><msub><mi>C</mi><mn>11</mn></msub></mrow></math></span>​ and <span><math><mrow><mspace></mspace><msub><mi>C</mi><mn>12</mn></msub></mrow></math></span>​ and the axial coupling term <span><math><mrow><mspace></mspace><msub><mi>C</mi><mn>13</mn></msub><mspace></mspace></mrow></math></span> exhibited the greatest variance, reflecting inversion sensitivity and the limited number of resonances below the continuum cutoff. Engineering moduli derived from RUS were internally consistent and in-plane values agreed closely with FEA predictions, but quasi-static measurements of the in-plane moduli <span><math><mrow><mspace></mspace><msub><mi>E</mi><mn>1</mn></msub><mo>=</mo><msub><mi>E</mi><mn>2</mn></msub></mrow></math></span> and out-of-plane modulus <span><math><mrow><mspace></mspace><msub><mi>E</mi><mn>3</mn></msub><mspace></mspace></mrow></math></span> were 20 % and 32 % lower, respectively. This divergence highlights fundamental differences in compliance across loading regimes: quasi-static compression is strongly influenced by strut bending, resin pooling, and boundary effects, whereas RUS probes free–free global vibrational modes that enforce affine deformation at the scale of the entire lattice, suppressing local compliance mechanisms and yielding higher effective moduli. Our study is an effort to test the boundaries of RUS for high-loss polymer lattices and to develop practices that could eventually reduce operator dependence.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"159 ","pages":"Article 107870"},"PeriodicalIF":4.1,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145318767","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":"High-precision wavefield simulation and deep learning-based sound speed reconstruction for transcranial ultrasound imaging.","authors":"Jing Yang, Yue Pan, Yu Qiang, Xingying Wang, Zhiqiang Zhang, Yanyan Yu, Hairong Zheng, Weibao Qiu","doi":"10.1016/j.ultras.2025.107860","DOIUrl":"https://doi.org/10.1016/j.ultras.2025.107860","url":null,"abstract":"<p><p>Transcranial ultrasound imaging plays an important role in the diagnosis of brain diseases and the monitoring of brain function. However, the quality of transcranial imaging is often impaired by the intricate acoustic properties of the skull. Accurate reconstruction of the skull's speed of sound (SoS) is critical for effective phase correction and enhanced image quality. In this study, we propose a transcranial SoS local reconstruction framework that integrates high-fidelity 2D numerical simulation with deep learning inversion. A custom wavefield simulation algorithm is developed to generate training datasets that can model spatially varying velocity and attenuation distributions. In the learning framework, we propose WAM-Net, which incorporates a Wavefront Attention Module (WAM) and a gradient-regularized loss function to reconstruct the skull's SoS accurately. In numerical simulations, the proposed WAM-Net method significantly improves reconstruction speed compared to full-waveform inversion (FWI), and reduces the SoS reconstruction error by 63.52% compared to AutoSoS. In skull-mimicking phantom experiments, the method demonstrates reliable SoS reconstruction across various inclinations and structural designs, with an average Mean Absolute Error (MAE) of 13.4844 m/s in Al₂O₃ phantom and a MAE of 31.3804 m/s in PMMA phantom. In the in-vivo experiments on a crab-eating macaque, the constructed SoS map effectively distinguishes between dense bone and porous bone in anatomically complex regions. These results indicate that the method provides an effective solution for real-time transcranial aberration correction, with high structural fidelity and robustness in heterogeneous cranial environments.</p>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"159 ","pages":"107860"},"PeriodicalIF":4.1,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145356060","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":"Comparison of mechanical and thermal effects of focused ultrasound on drug delivery efficiency and toxicity for pancreatic cancer treatment.","authors":"Doyeon Kim, Jiyoung Hong, Daeseung Kim, Wonchul Sim, Aesin Cho, Gio Gil, Hyungwon Moon, Hak-Jong Lee, Keonho Son","doi":"10.1016/j.ultras.2025.107861","DOIUrl":"https://doi.org/10.1016/j.ultras.2025.107861","url":null,"abstract":"<p><p>Pancreatic cancer remains one of the most lethal malignancies due to low response to chemotherapy. Focused ultrasound (FUS) has emerged as a promising strategy for enhancing tumor-specific drug delivery. However, chemotherapy in combination with FUS has still been limited by the unique tumor environment of pancreatic cancer. Thus, FUS application to clinical trials has been sufficiently considerable by several side effect. Therefore, many preclinical and clinical trials have been conducted to accelerate clinical application. This study demonstrates the effects of FUS-induced mechanical and thermal energies on drug delivery efficiency and safety in a PANC-1 xenografted BALB/c mouse model. Reflected acoustic pressure from tumors were analyzed to quantify cavitation effects, and enhancement of drug delivery investigated by fluorescence imaging. Anti-tumor efficacy with FUS exposure was compared using FOLFIRINOX. H&E, TUNEL assay and serum biochemistry were evaluated for the comparison of toxicity. The results demonstrated that increase of cavitation dose was dominantly dependent on the intensity, not duty cycle inducing thermal effect for the enhancement of drug accumulation to tumor. Mechanical effects by 2.0 kW/cm²-I_SPPA and 1 % duty cycle enhanced drug accumulation to tumor by 1.57-fold without tissue damage. Also, FOLFIRINOX combined with mechanical effects achieved superior antitumor efficacy, with 83.0 % tumor inhibition compared to 48.0 % with FOLFIRINOX alone. And mechanical effect was validated as a non-toxic energy for tumor treatment by H&E, TUNEL assay and serum biochemistry analysis. In conclusion, FUS-mediated mechanical effects can be one of candidate as a safe and effective strategy for tumor-specific drug delivery.</p>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"159 ","pages":"107861"},"PeriodicalIF":4.1,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145347569","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":"Ultrafast ultrasound imaging with a limited number of emissions based on Cantor selection pattern","authors":"Roya Paridar,&nbsp;Babak Mohammadzadeh Asl","doi":"10.1016/j.ultras.2025.107867","DOIUrl":"10.1016/j.ultras.2025.107867","url":null,"abstract":"<div><div>In coherent plane-wave compounding (CPWC), frame rate improvement is challenging. As the number of emissions reduces, the frame rate will increase. However, this improvement is at the cost of quality deterioration of the reconstructed image. To deal with the compromise between image quality and frame rate, we propose a novel method based on the Cantor selection pattern in this paper. In the proposed method, a set that includes a limited number of emissions (Cantor set) is sparsely selected within a specific angular interval. At this stage, the number of selected emissions is considerably reduced, and consequently, it can be promising in practical applications. Also, to prevent image quality degradation, we propose to use the multiple signal classification (MUSIC) algorithm’s output as a weighting factor. In the MUSIC algorithm, which is suitable for processing the sparse dataset, the second-order data associated with a larger number of uniformly selected emissions (called Co-emission) is constructed from the Cantor set, leading to quality improvement of the resulting image. Evaluations demonstrate that the proposed method improves the quality of the image in comparison with the delay-and-sum (DAS) method in which the emissions included in Cantor and Co-emission sets are used. In particular, for the experimental contrast phantom, and by using eight emissions, the proposed method leads to 50% and 45.45% resolution improvement compared to DAS corresponding to using the emission numbers included in Cantor set (i.e., 8) and Co-emission set (i.e., 27), respectively, while keeping the speckle preservation metric comparable to the other mentioned cases. Also, by using the proposed method, 46.49% and 0.63% contrast ratio improvement is achieved compared to DAS corresponding to using the emissions included in Cantor and Co-emission sets, respectively, for in-vivo dataset.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"159 ","pages":"Article 107867"},"PeriodicalIF":4.1,"publicationDate":"2025-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145318749","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}