Results 241 to 250 of about 297,354 (275)

Out-of-plane Doppler imaging based on ultrafast plane wave imaging

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2015
Retrieving the out-of-plane blood flow velocity vector from two-dimensional transverse acquisitions of large vessels could improve the quantification of flow rate and maximum speed. The in-plane vector flow component can be computed easily using the Doppler frequency shift.
Bruno-Felix, Osmanski, Gabriel, Montaldo, Mickael, Tanter   +2 more
openaire   +2 more sources

Image Correction for Transcranial Plane Wave Imaging

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA), 2019
In order to study the influence of skull on transcranial ultrasound imaging, we use linear acoustic equation and finite difference method to simulate the transcranial ultrasound field without skull and with skull respectively. The acoustic field is generated by a linear array with 64 elements and central frequency of 2.4MHz.
Ya-long SONG, Chang SU, Wei-jun LIN
openaire   +1 more source

Double Adaptive Plane-wave Imaging

2016 IEEE International Ultrasonics Symposium (IUS), 2016
This paper describes a contribution to the Plane-wave Imaging Challenge in Medical UltraSound (PICMUS). The suggested beamformer uses Capon's Minimum Variance beamforming technique to create the low quality plane-wave images and the same Minimum Variance criteria when coherently compounding multiple low quality plane-wave images into one image of ...
Ole Marius Hoel Rindal, Andreas Austeng
openaire   +1 more source

Wave equivalent plane estimation for wave reconstruction in imaging through water waves

2017 IEEE International Conference on Real-time Computing and Robotics (RCAR), 2017
Viewing an airborne scene from a totally submerged camera will suffer severe refractive distortions due to the water surface random fluctuation. One way to reduce this distortion is to use a wave sensor to image a known guide star, through which the water wave surface is measured and reconstructed. In the wave reconstruction, a wave equivalent plane is
Zhisheng Zhou, Guohua Jiao, Wei Chen 0152, Yuanfu Lu, Song Luo   +4 more
openaire   +1 more source

In vivo out-of-plane Doppler imaging based on ultrafast plane wave imaging

2013 IEEE International Ultrasonics Symposium (IUS), 2013
Retrieving the blood flow velocity vector on 2D acquisitions transverse to the vessel could improve the quantification of flow rate in large vessels. The in plane component is easily computed using the Doppler frequency shift. The main problem is to retrieve the angle between the probe imaging plane and the vessel axis to compute the out of plane ...
Bruno-Felix Osmanski, Gabriel Montaldo, Mathias Fink, Mickael Tanter   +3 more
openaire   +1 more source

The formation of plane-wave X-ray images of microdefects

physica status solidi (a), 1985
A theory of the formation of X-ray images of microdefects is developed. It is shown that at sufficiently high collimation of the incident wave it is possible not only to reveal such defects but also to obtain the images of their elastic fields almost without any additional diffraction within the Borrmann fan typical of the conventional topography.
V. Indenbom, V. Kaganer
openaire   +1 more source

Ultrafast plane wave imaging of breast lesions

The Journal of the Acoustical Society of America, 2023
Ultrafast plane wave imaging has great potential for 3-D functional ultrasound imaging but also comes with decreased lateral resolution, contrast, and penetration depth with respect to conventional imaging (CI). By utilizing coherent plane-wave compound imaging (CPWCI) and different beam forming techniques (Delay and Sum (DAS), Stolt’s-fk, and Lu’s-fk),
Chris L. de Korte, Gijs Hendriks, Marcus Radicke, Ritse Mann   +3 more
openaire   +1 more source

Terahertz wave focal-plane multiwavelength phase imaging

Journal of the Optical Society of America A, 2009
We 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, Hua, Zhong, Yan, Zhang, Nick, Karpowicz, Cunlin, Zhang, Yuejin, Zhao, Xi-Cheng, Zhang   +6 more
openaire   +2 more sources

Adaptive beamforming in ultrasound imaging with plane wave compounding

2014 International Conference on Audio, Language and Image Processing, 2014
Ultrasound 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, Xing Zeng, Jinhua Yu, Yuanyuan Wang 0001   +3 more
openaire   +1 more source

Plane Wave Acoustic Superposition for fast ultrasound imaging

2016 IEEE International Ultrasonics Symposium (IUS), 2016
We introduce a novel method for ultrasound plane wave imaging that combines the plane wave decomposition of the incident pulse with the exact solution for the scattered field from small spherical scatterers. We model the measured RF-signal by a sparse linear system and formulate a corresponding discrete inverse problem, that can accommodate various ...
Bodnariuc, Ecaterina, Schiffner, Martin, Petra, Stefania, Schnorr, Christoph   +3 more
openaire   +1 more source