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Terahertz wave focal-plane multiwavelength phase imaging
Journal of the Optical Society of America A, 2009We present a multiwavelength phase imaging method for terahertz (THz) reflective focal-plane imaging. The phase of the THz pulse at each pixel is linearly fitted within the effective frequency range to reconstruct the ranging profile of the object.
Liangliang, Zhang +6 more
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Adaptive beamforming in ultrasound imaging with plane wave compounding
2014 International Conference on Audio, Language and Image Processing, 2014Ultrasound plane-wave imaging can achieve the high frame rate but suffers from the image degradation since the beamforming process is restricted only in the receiving mode. Coherent compounding of multi-angle plane waves has been proposed to improve the image quality.
Jinxin Zhao +3 more
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Optimized Plane Wave Imaging for Fast and High-Quality Ultrasound Imaging
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2016This paper presents a method for optimizing parameters affecting the image quality in plane wave imaging. More specifically, the number of emissions and steering angles is optimized to attain the best images with the highest frame rate possible. The method is applied to a specific problem, where image quality for a λ -pitch transducer is compared with ...
Jonas Jensen +2 more
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Imaging overturned waves by plane‐wave migration in tilted coordinates
SEG Technical Program Expanded Abstracts 2004, 2004We image overturned waves by decomposing the source and receiver wavefields into plane-waves. For each plane-wave, we extrapolate the source and receiver wavefields in a tilted coordinate system and cross-correlate them to obtain Common Image Gathers (CIGs).
Guojian Shan, Biondo Biondi
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Local Plane-Wave Imaging of GPR Data
Journal of Environmental & Engineering Geophysics, 2003Local Plane-Wave processing is used to image synthetic Ground Penetrating Radar (GPR) data in a non-homogeneous background. Numerically calculated Green’s functions are used to back propagate the data down to a Green’s function node in the center of the region to be imaged.
Svein-Erik Hamran +2 more
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Common angle imaging with offset plane waves
SEG Technical Program Expanded Abstracts 1997, 1997Migration is commonly used as a wavefield focussing tool in the study of the variation of reflection amplitude with offset (AVO), or with angle of incidence at reflectors. Migrations are typically applied to common offset or common incident angle sections.
Charles C. Mosher +2 more
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Plane-wave imaging of ocular blood-flow
The Journal of the Acoustical Society of America, 2019Blood-flow plays an important role in pathogenesis and progression of many ocular diseases. While optical coherence tomography angiography (OCT-A) has revolutionized depiction of the retinal vasculature, it provides little information regarding flow velocities and cannot visualize the arteries and veins supplying and draining the eye.
Ronald H. Silverman +4 more
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Plane wave imaging using phased array
AIP Conference Proceedings, 2014Phased arrays are often used for rapid inspections. Phased arrays can be used to synthesize different wave fronts. For imaging, focused wave fronts are frequently used. In order to build an image, the phased array has to be fired multiple times at the same location. Alternatively, different data acquisition configurations can be designed in combination
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Apparatus for multimodal plane wave ultrasound imaging
The Journal of the Acoustical Society of America, 2006An ultrasonic imaging apparatus combined with an x-ray imaging apparatus and/or an additional ultrasonic imaging apparatus performs ultrasonic sonography and/or x-ray imaging or multiple ultrasonic sonography to produce imagery that are spatially correlated. A holding means holds an object to be imaged in compression in an examination area.
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Coherent Plane Wave Compounding Combined With Tensor Completion Applied for Ultrafast Imaging
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2021Hamid Behnam, Sajjad Afrakhteh
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