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A Joint delay-and-sum and Fourier Beamforming Method for High Frame Rate Ultrasound Imaging

Computer Modeling in Engineering & Sciences 2020年第4期123卷 427-440页

作者： Wei Zhao Shuai Feng Yadan Wang Yuanguo Wang Zhihui Han Hu Peng Department of Biomedical Engineering Hefei University of TechnologyHefei230009China Yijishan Hospital of Wannan Medical College Wuhu241001China

Frame rate is an important metric for ultrasound imaging systems,and high frame rates(HFR)benefit moving-target *** common way to obtain HFR imaging is to transmit a plane ***-and-sum(DAS)beamformer is a conventional beamforming algorithm,which is simple and has been widely implemented in clinical *** beamforming is an alternative method for HFR imaging and has high levels of imaging efficiency,imaging speed,and good temporal dynamic ***,the resolution and contrast performance of HFR imaging based on DAS or Fourier beamforming are insufficient due to the single plane wave *** address this problem,a joint DAS and Fourier beamforming method is introduced in this *** proposed method considers the different distributions of sidelobes in DAS imaging and Fourier imaging and combines the angular spectrum and DAS to reconstruct ultrasound *** proposed method is evaluated on simulation and experimental phantom datasets to compare its performance with DAS and Fourier beamforming *** demonstrate that the proposed method improves image effective dynamic range and resolution while also retaining a high frame rate of the ultrasound imaging *** proposed method improves the effective dynamic range along axial and lateral directions by 10 dB,compared to standard DAS and Fourier beamforming.

关键词： High frame rate imaging delay-and-sum Fourier transformation angular spectrum.

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Adaptive diagonal loaded minimum variance beamforming applied to medical ultrasound imaging

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Journal of Central South University 2015年第5期22卷 1826-1832页

作者：刘昊霖张志宏刘东权 College of Computer Science Sichuan University Department of Computer Science and Technology Changsha University Saset Healthcare Inc

In order to enhance the robustness and contrast in the minimum variance(MV) beamformer, adaptive diagonal loading method was proposed. The conventional diagonal loading technique has already been used in the MV beamformer, but has the drawback that its level is specified by predefined parameter and without consideration of input-data. To alleviate this problem, the level of diagonal loading was computed appropriately and automatically from the given data by shrinkage method in the proposed adaptive diagonal loaded beamformer. The performance of the proposed beamformer was tested on the simulated point target and cyst phantom was obtained using Field II. In the point target simulation, it is shown that the proposed method has higher lateral resolution than the conventional delay-and-sum beamformer and could be more robust in estimating the amplitude peak than the MV beamformer when acoustic velocity error exists. In the cyst phantom simulation, the proposed beamformer has shown that it achieves an improvement in contrast ratio and without distorting the edges of cyst.

关键词： medical ultrasound imaging minimum variance beamforming diagonal loading delay-and-sum beamforming contrast robustness

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Prototype of an Echo-PIV Method for Use in Underwater Nuclear Decommissioning Inspections

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Journal of Flow Control, Measurement & Visualization 2019年第1期7卷 28-43页

作者： Takuya Kawachi Robert Malkin Hideharu Takahashi Hiroshige Kikura Tokyo Institute of Technology Tokyo Japan University of Bristol Bristol United Kingdom

The ongoing decommissioning of the Fukushima Daiichi (1F) nuclear power plant requires the inspection of the inside of containment vessels that have been submerged in water. These inspections must locate leaks and map the distribution of fuel debris in water with very low visibility. This paper reports the design and testing of an echo-PIV system that uses a single divergent signal wave and delay-and-sum processing to efficiently map the interior and fluid flow within a submerged vessel. The diverging wave and delay-and-sum processing improve upon the performance of conventional ultrasound PIV methods specifically to meet the demands of containment vessel inspections. The imaging method uses an ultrasonic linear sensor array that emits a diverging wave that covers a wide angle with a single transmission. The delay-and-sum algorithm combines echo signals recorded by each element of the sensor array. We optimized the design of an echo-PIV system in laboratory-scale tests, and then tested the prototype with a mockup of a containment vessel in a water tank. The small-scale prototype successfully located a mock leak and mapped the surface of a piece of mock debris. This prototype can be scaled up readily for inspections at the Fukushima Daiichi plant.

关键词： Echo-PIV Diverging Beam Transmission delay-and-sum Algorithm Vector Flow Mapping Surface Mapping 1F Decommissioning

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