Preliminary in-vivo evaluation of convex array synthetic aperture imaging

2004 ◽  
Author(s):  
Morten H. Pedersen ◽  
Kim L. Gammelmark ◽  
J°rgen A. Jensen
Keyword(s):  
Synthetic Aperture ◽  
Synthetic Aperture Imaging ◽  
In Vivo Evaluation

In-vivo evaluation of convex array synthetic aperture imaging

2007 ◽  
Vol 33 (1) ◽  
pp. 37-47 ◽  
Author(s):  
Morten H. Pedersen ◽  
Kim L. Gammelmark ◽  
Jørgen A. Jensen
Keyword(s):  
Synthetic Aperture ◽  
Synthetic Aperture Imaging ◽  
In Vivo Evaluation

Evaluation of Ultrasound Synthetic Aperture Imaging Using Bidirectional Pixel-Based Focusing: Preliminary Phantom and In Vivo Breast Study

2013 ◽  
Vol 60 (10) ◽  
pp. 2716-2724 ◽  
Author(s):  
Choye Kim ◽  
Changhan Yoon ◽  
Jong-Ho Park ◽  
Yuhwa Lee ◽  
Won Hwa Kim ◽  
...  
Keyword(s):  
Synthetic Aperture ◽  
Synthetic Aperture Imaging

In Vivo Evaluation of Synthetic Aperture Sequential Beamforming

2012 ◽  
Vol 38 (4) ◽  
pp. 708-716 ◽  
Author(s):  
Martin Christian Hemmsen ◽  
Peter Møller Hansen ◽  
Theis Lange ◽  
Jens Munk Hansen ◽  
Kristoffer Lindskov Hansen ◽  
...  
Keyword(s):  
Synthetic Aperture ◽  
In Vivo Evaluation

Preliminary in-vivo evaluation of synthetic aperture sequential beamformation using a multielement convex array

2011 ◽  
Author(s):  
Martin Christian Hemmsen ◽  
Peter Moller Hansen ◽  
Theis Lange ◽  
Jens Munk Hansen ◽  
Svetoslav Ivanov Nikolov ◽  
...  
Keyword(s):  
Synthetic Aperture ◽  
In Vivo Evaluation

An Efficient Motion Estimation and Compensation Method for Ultrasound Synthetic Aperture Imaging

2002 ◽  
Vol 24 (2) ◽  
pp. 81-99 ◽  
Author(s):  
K.S. Kim ◽  
J.S. Hwang ◽  
J.S. Jeong ◽  
T.K. Song
Keyword(s):  
Motion Compensation ◽  
Region Of Interest ◽  
Doppler Frequency ◽  
Maximum Energy ◽  
Motion Artifacts ◽  
Compensation Method ◽  
Synthetic Aperture ◽  
Axial Motion ◽  
Synthetic Aperture Imaging

This paper describes a method for overcoming motion artifacts in synthetic aperture imaging. The method is based on a computer simulation study on the influence of target motion on synthetic aperture techniques. A region-based motion compensation approach is used in which only the axial motion is estimated and compensated for a given region of interest under the assumption that the whole ROI moves uniformly. The estimated axial motion is calculated with a crosscorrelation method at the point where the focused signal has the maximum energy within the ROI. We also present a method for estimating axial motion using the autocorrelation method that is widely used to estimate average Doppler frequency. Both computer simulations and in vivo experiments show that the proposed crosscorrelation-based method can greatly improve the spatial resolution and SNR of ultrasound imaging by implementing SA techniques for two-way dynamic focusing without motion artifacts. In addition, the autocorrelation-based motion compensation method provides almost the same results as the crosscorrelation-based method, but with a dramatically reduced computational complexity.

Fourier-based Synthetic-aperture Imaging for Arbitrary Transmissions by Cross-correlation of Transmitted and Received Wave-fields

2021 ◽  
pp. 016173462110263
Author(s):  
Rehman Ali
Keyword(s):  
Synthetic Aperture ◽  
Single Element ◽  
Reconstruction Technique ◽  
Virtual Source ◽  
Synthetic Aperture Imaging ◽  
Medical Ultrasound Imaging ◽  
Full Waveform ◽  
Coherence Imaging ◽  
Conventional Ultrasound

Investigations into Fourier beamforming for medical ultrasound imaging have largely been limited to plane-wave and single-element transmissions. The main aim of this work is to generalize Fourier beamforming to enable synthetic aperture imaging with arbitrary transmit sequences. When applied to focused transmit beams, the proposed approach yields a full-waveform-based alternative to virtual-source synthetic aperture, which has implications for both coherence imaging and sound speed estimation. When compared to virtual-source synthetic aperture and retrospective encoding for conventional ultrasound sequences (REFoCUS), the proposed imaging technique shows an 8.6 and 3.8 dB improvement in contrast over virtual source synthetic aperture and REFoCUS, respectively, and a 55% improvement in point target resolution over virtual source synthetic aperture. The proposed image reconstruction technique also demonstrates general imaging improvements in vivo, while avoiding limitations seen in prior techniques.

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