Evaluation of a synthetic aperture technique for medical ultrasound imaging: Phantom and in vivo breast study

2012 ◽  
Author(s):  
Choye Kim ◽  
Changhan Yoon ◽  
Won Hwa Kim ◽  
Jung Min Chang ◽  
Tai-Kyung Song ◽  
...  
Keyword(s):  
Ultrasound Imaging ◽  
Synthetic Aperture ◽  
Medical Ultrasound ◽  
Medical Ultrasound Imaging

scholarly journals Cross Subaperture Averaging Generalized Sidelobe Canceler Beamforming Applied to Medical Ultrasound Imaging

2021 ◽  
Vol 11 (18) ◽  
pp. 8689
Author(s):  
Jin Yang ◽  
Jiake Li ◽  
Xiaodong Chen ◽  
Jiaqi Xi ◽  
Huaiyu Cai ◽  
...  
Keyword(s):  
Covariance Matrix ◽  
Ultrasound Imaging ◽  
Imaging System ◽  
Synthetic Aperture ◽  
Lateral Resolution ◽  
Accurate Estimation ◽  
Medical Ultrasound ◽  
Matrix Estimation ◽  
Medical Ultrasound Imaging ◽  
Cross Covariance

For adaptive ultrasound imaging, a reliable estimation of the covariance matrix has a decisive influence on the performance of beamformers. In this paper, we propose a new cross subaperture averaging generalized sidelobe canceler approach (GSC-CROSS) for medical ultrasound imaging, which uses the cross-covariance matrix instead of the traditional covariance matrix estimation. By using the more stable and accurate estimation of the covariance matrix, GSC-CROSS performs well in both lateral resolution and contrast. Experiments are conducted based on the simulated echo data of scattering points and a cyst target. Beamforming responses of scattering points show that GSC-CROSS can improve the lateral resolution by 76.9%, 68.8%, and 17.1% compared with delay-and-sum (DS), synthetic aperture (SA), and the traditional generalized sidelobe canceler (GSC), respectively. Also, imaging of the cyst target shows that compared with DS, SA, and GSC, the contrast increases by 101%, 32.6%, and 63.5%, respectively. Finally, the actual echo data collected from a medical ultrasonic imaging system is applied to reconstruct the image. Results show that the proposed method has a good performance on lateral resolution and contrast. Both the simulated and experimental data demonstrate the effectiveness of the proposed method.

Applying Coherence Factor to Double-Stage Delay Multiply and Sum Beamforming in Medical Ultrasound Imaging

2021 ◽  
Vol 11 (8) ◽  
pp. 2091-2099
Author(s):  
Ke Song ◽  
Paul Liu ◽  
Dong C. Liu ◽  
Jian Zhan
Keyword(s):  
Ultrasound Imaging ◽  
The Other ◽  
Medical Ultrasound ◽  
New Approach ◽  
Medical Ultrasound Imaging ◽  
Coherence Factor ◽  
Beamforming Algorithm ◽  
The Way

The Filtered Delay Multiply and Sum (F-DMAS) beamforming algorithm has recently been proposed to improve the resolution and contrast in ultrasound imaging. Based on F-DMAS, some researchers have introduced an alternative named Double-Stage Delay Multiply and Sum (DS-DMAS), which can be considered as an enhanced version of F-DMAS. The DS-DMAS expands the DMAS algorithm to synthesize some new signals, which are then beamformed using a DMAS beamformer. However, the way to generate new signals in DS-DMAS can be thought of as a Delay and Sum (DAS) operation. There are some shortages in the DAS algorithm, so we proposed a new approach named Coherence Factor based Double-Stage Delay Multiply and Sum (DS-DMAS-CF) to address these issues. The key idea of our method is to optimize the DAS operation in DS-DMAS. Therefore, a modified coherence factor (CF) is applied to weight each item in DS-DMAS. The simulation, experimental and in vivo data are used to compare the performance between DAS, F-DMAS, DS-DMAS and DS-DMAS-CF The results show that the DS-DMAS-CF gets better resolution and contrast in comparison with the other three algorithms.

Splatting and Splines in 3D Medical Ultrasound Imaging

1995 ◽  
pp. 349-355
Author(s):  
Timothy J. Pitt ◽  
Leonard A. Ferrari ◽  
Andy Healey ◽  
R. Anthony Reynolds ◽  
Keith N. Humphries
Keyword(s):  
Ultrasound Imaging ◽  
Medical Ultrasound ◽  
Medical Ultrasound Imaging
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