Ultrasonics最新文献

{"title":"An ultra-thin MXene film with high conversion efficiency for broadband ultrasonic photoacoustic transducer","authors":"Wenqi Zhang ,&nbsp;Ruolan Yang ,&nbsp;Lai Wei ,&nbsp;Jinxu Wei ,&nbsp;Xiangying Meng ,&nbsp;Hanyue Ma ,&nbsp;Yujia Pang ,&nbsp;Yuanyuan Li ,&nbsp;Hui Xia ,&nbsp;Songmei Wu","doi":"10.1016/j.ultras.2025.107633","DOIUrl":"10.1016/j.ultras.2025.107633","url":null,"abstract":"<div><div>High-pressure, broadband, and miniatured ultrasound emitters are urgently needed in biomedical imaging and treatment as well as non-destructive detection. In this work, we report a laser generated ultrasonic photoacoustic transducer (LGUPT) based on an ultra-thin layer of MXene (Ti<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>C<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>T<span><math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span>) nanosheets. Under the excitation of <span><math><mrow><mn>532</mn><mspace></mspace><mi>nm</mi></mrow></math></span> nanosecond laser pulses, the amplitude of the generated sound pressure can reach <span><math><mrow><mn>8</mn><mo>.</mo><mn>7</mn><mspace></mspace><mi>MPa</mi></mrow></math></span>, with a bandwidth of <span><math><mrow><mn>17</mn><mo>.</mo><mn>4</mn><mspace></mspace><mi>MHz</mi></mrow></math></span> at the irradiation intensity of <span><math><mrow><mn>17</mn><mo>.</mo><mn>72</mn><mspace></mspace><mi>mJ</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>. The photoacoustic conversion efficiency of the <span><math><mrow><mn>1</mn><mo>.</mo><mn>2</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>-thick MXene film/PDMS transducer was found to be <span><math><mrow><mn>1</mn><mo>.</mo><mn>21</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>, which is among the highest values reported to date. The MXene thin film can also be drop-casted on the curved surface of a focusing lens. The amplitude of the sound pressure signal can reach 25.3 <span><math><mi>MPa</mi></math></span> and the bandwidth <span><math><mrow><mn>19</mn><mo>.</mo><mn>7</mn><mspace></mspace><mi>MHz</mi></mrow></math></span> at a pulse laser energy of <span><math><mrow><mn>28</mn><mo>.</mo><mn>12</mn><mspace></mspace><mi>mJ</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>. The width of the focal spot at −3 dB of maximum amplitude was found in the range of <span><math><mrow><mi>0.14</mi><mspace></mspace><mi>mm</mi></mrow></math></span> for the optical lens based LGUPT under the condition of a laser spot diameter of <span><math><mrow><mi>15</mi><mspace></mspace><mi>mm</mi></mrow></math></span> by theoretical simulation. The water processable focusing LGUPT demonstrated excellent ultrasonic cavitation effect on the tissue mimicking agar plate. Our experimental and theoretical work highlights the potential of ultra-thin MXene film based LGUPTs for high precision photoacoustic therapy, integrated imaging and sensing instruments.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107633"},"PeriodicalIF":3.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143674568","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":"Transcranial adaptive aberration correction using deep learning for phased-array ultrasound therapy","authors":"Quan Zhang,&nbsp;Weihao Sun,&nbsp;Jie Deng,&nbsp;Tingting Qi,&nbsp;Mingxi Wan,&nbsp;Mingzhu Lu","doi":"10.1016/j.ultras.2025.107641","DOIUrl":"10.1016/j.ultras.2025.107641","url":null,"abstract":"<div><div>This study aims to explore the feasibility of a deep learning approach to correct the distortion caused by the skull, thereby developing a transcranial adaptive focusing method for safe ultrasonic treatment in opening of the blood–brain barrier (BBB). However, aberration correction often requires significant computing power and time to ensure the accuracy of phase correction. This is due to the need to solve the evolution procedure of the sound field represented by numerous discretized grids. A combined method is proposed to train the phase prediction model for correcting the phase accurately and quickly. The method comprises pre-segmentation, k-Wave simulation, and a 3D U-net-based network. We use the k-Wave toolbox to construct a nonlinear simulation environment consisting of a 256-element phased array, a small piece of skull, and water. The skull sound speed sample combining with the phase delay serves as input for the model training. The focus volume and grating lobe level obtained by the proposed approach were the closest to those obtained by the time reversal method in all relevant approaches. Furthermore, the mean peak value obtained by the proposed approach was no less than 77% of that of the time reversal method. In this study, the computational cost of each sample’s phase delay was no more than 0.05 s, which was 1/200th of the time reversal method. The proposed method eliminates the complexity of numerical calculation processes requiring consideration of more acoustic parameters, while circumventing the substantial computational resource demands and time-consuming challenges to traditional numerical approaches. The proposed method enables rapid, precise, and adaptive transcranial aberration correction on the 3D skull-based conditions, overcoming the potential inaccuracies in predicting the focal position or the acoustic energy distribution from 2D simulations. These results show the possibility of the proposed approach enabling near-real-time correction of skull-induced phase aberrations to achieve transcranial focus, thereby offering a novel option for treating brain diseases through temporary BBB opening.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107641"},"PeriodicalIF":3.8,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143674570","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 emission with simulation of simultaneous ultrasonic guided wave propagation & crack propagation","authors":"Fahim Md Mushfiqur Rahman,&nbsp;Sourav Banerjee","doi":"10.1016/j.ultras.2025.107637","DOIUrl":"10.1016/j.ultras.2025.107637","url":null,"abstract":"<div><div>Advancement of computation nondestructive evaluation (CNDE) creates an opportunity to visualize predicted signals received by sensors and may aid the development of artificial intelligence (AI) for NDE 4.0. However, traditional methods face limitations for crack propagation and guided wave propagation simulation, <em>simultaneously.</em> Modeling crack propagation using mesh-based method requires remeshing and implementation of cohesive zone model to name a few alternatives. Multiple meshfree methods have also been implemented for crack propagation but did not immediately translate to simulate the guided waves that are used to interrogate the cracks under nondestructive evaluation (NDE) framework. Ultrasonic CNDE with new era of Machine Learning (ML)/AI requires understanding the signals and its physics-based features when the guided waves propagate to interact with the crack while the crack is simultaneously growing at different time scales. To enable the future of physics to be informed and physics driven ML/AI this article presents a framework of CNDE where guided wave propagation and crack propagation are simultaneously simulated without remeshing and creates an enabling approach for the future AI implementation. A few successful case studies are presented for feasibility demonstration. Detailed flowcharts are presented for easy implementation of the method for the ultrasonic NDE community.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"151 ","pages":"Article 107637"},"PeriodicalIF":3.8,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acoustic nonlinearity parameters in hyperelastic solids with quadratic nonlinearity","authors":"Jianmin Qu","doi":"10.1016/j.ultras.2025.107621","DOIUrl":"10.1016/j.ultras.2025.107621","url":null,"abstract":"<div><div>In general, the nonlinear behavior of an elastic wave in isotropic hyperelastic solids with quadratic nonlinearity depends on five independent elastic constants, namely, the three third-order elastic constants and two second-order elastic constants. In this article, we show that such nonlinear behavior can be described fully by only three independent non-dimensional parameters if the wave motion is two-dimensional. Furthermore, if the motion is a plane wave, only two independent non-dimensional parameters are needed to fully describe the nonlinear behavior of the wave. These results are useful for conducting numerical simulations and for interpreting experimental measurement data.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"151 ","pages":"Article 107621"},"PeriodicalIF":3.8,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628897","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 black hole ultrasonic radiator for high-efficiency radiation","authors":"Yang Liu,&nbsp;Cheng Chen,&nbsp;Shuyu Lin","doi":"10.1016/j.ultras.2025.107630","DOIUrl":"10.1016/j.ultras.2025.107630","url":null,"abstract":"<div><div>The utilization of conventional longitudinal transducers in the field of ultrasonic liquid processing is constrained by limitations in radiation area and directional characteristics. These limitations can be addressed through the implementation of mode conversion techniques. However, an expanded radiation area may also result in reduced acoustic radiation intensity. To mitigate this issue, this study proposes an Acoustic Black Hole Ultrasonic Radiator (ABHUR) designed to enhance ultrasound intensity and thereby achieve high-efficiency radiation. The proposed ABHUR comprises a Bolted Langevin-type Transducer (BLT) and a Curved Acoustic Black Hole (CABH) ring. A theoretical model, based on the transfer matrix method, is developed to analyze the in-plane vibrational behavior of the CABH ring, and its validity is confirmed through Finite Element Method (FEM) simulations. The underwater vibrational and sound field distribution properties of the ABHUR are investigated using FEM and compared with two alternative radiators employing longitudinal-bending (L-B) and longitudinal-radial (L-R) modes. Owing to the unique properties of the Acoustic Black Hole structure (ABHs), which amplify bending wave amplitudes and concentrate energy, the ABHUR operating in L-B mode demonstrates superior ultrasound intensity. Furthermore, a prototype of the ABHUR is fabricated, and a series of three experiments are conducted to validate the operational feasibility of the proposed system.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"151 ","pages":"Article 107630"},"PeriodicalIF":3.8,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631971","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 time-frequency energy segmentation reconstruction method for multimodal ultrasonic guided waves","authors":"Weiyang Kong ,&nbsp;Dan Li ,&nbsp;Liang Zeng ,&nbsp;Ying Li ,&nbsp;Jian Qiu Zhang ,&nbsp;Dean Ta","doi":"10.1016/j.ultras.2025.107635","DOIUrl":"10.1016/j.ultras.2025.107635","url":null,"abstract":"<div><div>Multimodal ultrasonic guided wave (UGW) signal reconstruction technology can accurately separate individual modes, providing more comprehensive and precise information for material nondestructive testing. However, the accuracy of existing reconstruction techniques heavily depends on the precision and completeness of time–frequency (TF) ridge extraction. To address this challenge, this paper proposes a TF energy segmentation reconstruction method without relying on complete TF ridge extraction, as traditionally required. This approach introduces an adaptive noise variance estimation Bayesian filter to extract the TF ridges under unknown noise distribution, particularly in regions where TF ridges intersect or overlap. By using the extracted TF ridges as references, the energy segmentation method directly separates and reconstructs UGW modes from the TF representation even when the extracted TF ridges are incomplete. This is because the proposed method can automatically retrieve the energy of each mode with a region growing algorithm from the time domain and frequency domain so that both modes with rapidly changing instantaneous frequency or group delay can be recovered, while the traditional method can only separate modes from a single domain. Numerical simulations and photoacoustic-guided wave experiments validate the effectiveness of the proposed method, achieving reconstruction accuracies of 96.9% and 92.5% for the simulated and experimental signals, respectively.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"151 ","pages":"Article 107635"},"PeriodicalIF":3.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631970","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":"Non-contacting laser-ultrasonic fouling detection on steel pipes","authors":"Joonas Mustonen ,&nbsp;Denys Iablonskyi ,&nbsp;Shayan Gharib ,&nbsp;Joonas Suorsa ,&nbsp;Martin Weber ,&nbsp;Arto Klami ,&nbsp;Edward Hæggström ,&nbsp;Ari Salmi","doi":"10.1016/j.ultras.2025.107617","DOIUrl":"10.1016/j.ultras.2025.107617","url":null,"abstract":"<div><div>In many industrial processes, accumulation of fouling can lead to decreased production efficiency by weakening the flow in pipes or causing additional friction on the ships’ hulls. To detect the fouled areas for descaling, ultrasonic guided waves (UGWs) can be utilized. Usually, this is carried out by coupling phased array collars of contact transducers onto the pipe. This can cause problems if the coupling changes over time, the temperature of the pipe is too high or the sensors need to be relocated. Here, we demonstrate how fouling can be detected without contact sensors, by using a pulse laser and a laser Doppler vibrometer. Furthermore, by employing broadband laser excitation, we are able to define the fouling attenuation coefficient and investigate the frequency dependencies of fouling-induced attenuation.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"151 ","pages":"Article 107617"},"PeriodicalIF":3.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the vibration performance and sound field of a novel push-pull ultrasonic transducer with slotted tube","authors":"Fengming Li ,&nbsp;Shiqing Liu ,&nbsp;Xiaomei Zeng ,&nbsp;Long Xu ,&nbsp;Haidao Zhang ,&nbsp;Zhaohuan Wang ,&nbsp;Zhaojiang Chen","doi":"10.1016/j.ultras.2025.107636","DOIUrl":"10.1016/j.ultras.2025.107636","url":null,"abstract":"<div><div>To address the challenges in ultrasonic processing for large capacity liquids, improving the electroacoustic conversion efficiency, expanding the radiation direction, and enhancing the uniformity of the sound field have become imperative and focal objectives in the design of high-power ultrasonic transducers. Hence, a novel push-pull slotted tube ultrasonic transducer (PSTUT) based on longitudinal-bending mode conversion has been proposed. The PSTUT is composed of four key parts: two sandwich transducers, two stepped horns, two end caps, and a slotted tube radiator. By applying push-pull longitudinal excitation, the caps produce longitudinal bending vibration, while the arc-shaped plates produce radial bending vibration, capable of achieving efficient, uniform, and omnidirectional ultrasound radiation. Based on the principle of electromechanical analogy and the theory of Timoshenko beams, the electromechanical equivalent circuits of the uniform beam in bending vibration and the PSTUT in coupled vibration are established. The frequency response of the PSTUT is validated by the finite element method simulations and experiments. The vibration analysis demonstrates that adjusting the size of the circular slotted tube radiator can control both the range and intensity of radial radiation. Simulated and experimental results show that the PSTUT exhibits satisfactory 3D-omnidirectional radiation capability and improved sound field uniformity in water. The proposed PSTUT offers a promising solution to overcome the bottleneck in ultrasonic liquid treatment technology.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"151 ","pages":"Article 107636"},"PeriodicalIF":3.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642201","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":"Geometric a priori informed bent-ray tracing for accelerated sound speed imaging in ultrasound computed tomography","authors":"Yiming Huang ,&nbsp;Yi Zeng ,&nbsp;Shilong Cui ,&nbsp;Chengcheng Liu ,&nbsp;Xiran Cai","doi":"10.1016/j.ultras.2025.107595","DOIUrl":"10.1016/j.ultras.2025.107595","url":null,"abstract":"<div><div>Bent-ray tracing ultrasound computed tomography (USCT) is a promising technique for breast cancer screening which quantitatively provides speed-of-sound (SOS) distribution in human breasts. In this modality, SOS images are reconstructed with an iterative process to match the measured time-of-flights and the ones predicted by Eikonal equation solved with the fast marching method (FMM). The Eikonal equation is meant to be applied in SOS heterogeneous media and its evaluation with FMM is an computational expensive process. However, in USCT, the object is placed in a homogeneous coupling medium. Thus, the acoustic environment is formed by two parts, the homogeneous background (coupling medium) and the heterogeneous object. In this work, we leverage this strong <em>a priori</em> information and propose a method to accelerate SOS image formation for bent-ray tracing USCT. We show that, given the boundary information of the object, Eikonal equation only needs to be evaluated in a limited area covering the object. For that, the partial FMM and the associated ray-tracing strategy are proposed to reduce the computational cost of the forward modeling. We also managed to restrict image reconstruction area inside the object for improved convergence rate of the optimization. Both the simulation and phantom imaging experiments with ring transducer arrays demonstrated that the proposed method reduces the reconstruction time in an object size dependent manner. For the object occupying 20.3% to 56.3% of the image field of the ring array, we observed 30.1%–61.9% reduction in image reconstruction time without sacrificing the image quality, compared to classical method. The proposed strategy can be adopted for fast SOS imaging with bent-ray tracing USCT to improve patient throughput for breast cancer screening.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"151 ","pages":"Article 107595"},"PeriodicalIF":3.8,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600995","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":"Feature compensation and network reconstruction imaging with high-order helical modes in cylindrical waveguides","authors":"Zhao Wang ,&nbsp;Xiao Ying ,&nbsp;Junkai Tong ,&nbsp;Wen Luo ,&nbsp;Fuzai Lv ,&nbsp;Zhifeng Tang ,&nbsp;Yang Liu","doi":"10.1016/j.ultras.2025.107631","DOIUrl":"10.1016/j.ultras.2025.107631","url":null,"abstract":"<div><div>Pipe wall loss assessment is crucial in oil and gas transportation. Ultrasonic guided wave is an effective technology to detect pipe defects. However, accurately inverting weak-feature defects under limited view conditions remains challenging due to constraints in transducer arrangements and inconsistent signal characteristics. This paper proposes a stepwise inversion method based on feature compensation and network reconstruction through deep learning, combined with high-order helical guided waves to expand the imaging view and achieve high-resolution imaging of pipe defects. A forward model was established using the finite difference method, with the two-dimensional Pearson correlation coefficient and maximum wall loss estimation accuracy defined as imaging metrics to evaluate and compare the method. Among 50 randomly selected defect samples in the test set, the inversion model achieved a correlation coefficient of 0.9669 and a maximum wall loss estimation accuracy of 96.65 %. Additionally, Gaussian noise was introduced to assess imaging robustness under pure signal, 5 dB, and 3 dB conditions. Laboratory experiments validated the practical feasibility of the proposed method. This approach is generalizable and holds significant potential for nondestructive testing in cylindrical waveguide structures represented by pipes.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"151 ","pages":"Article 107631"},"PeriodicalIF":3.8,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631969","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}