scholarly journals In Vivo Evaluation of Plane Wave Imaging for Abdominal Ultrasonography

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5675
Author(s):  
Sua Bae ◽  
Jintae Jang ◽  
Moon Hyung Choi ◽  
Tai-Kyong Song
Keyword(s):  
Plane Wave ◽  
Focal Depth ◽  
Artifact Reduction ◽  
Promising Technique ◽  
In Vivo Evaluation ◽  
Abdominal Ultrasonography ◽  
Acquisition Rate ◽  
Array Transducer ◽  
Wave Imaging

Although plane wave imaging (PWI) has been extensively employed for ultrafast ultrasound imaging, its potential for sectorial B-mode imaging with a convex array transducer has not yet been widely recognized. Recently, we reported an optimized PWI approach for sector scanning that exploits the dynamic transmit focusing capability. In this paper, we first report the clinical applicability of the optimized PWI for abdominal ultrasonography by in vivo image and video evaluations and compare it with conventional focusing (CF) and diverging wave imaging (DWI), which is another dynamic transmit focusing technique generally used for sectorial imaging. In vivo images and videos of the liver, kidney, and gallbladder were obtained from 30 healthy volunteers using PWI, DWI, and CF. Three radiologists assessed the phantom images, 156 in vivo images, and 66 in vivo videos. PWI showed significantly enhanced (p < 0.05) spatial resolution, contrast, and noise and artifact reduction, and a 4-fold higher acquisition rate compared to CF and provided similar performances compared to DWI. Because the computations required for PWI are considerably lower than that for DWI, PWI may represent a promising technique for sectorial imaging in abdominal ultrasonography that provides better image quality and eliminates the need for focal depth adjustment.

scholarly journals Effects of Non-Elevation-Focalized Linear Array Transducer on Ultrasound Plane-Wave Imaging

Sensors ◽  
2016 ◽  
Vol 16 (11) ◽  
pp. 1906
Author(s):  
Congzhi Wang ◽  
Yang Xiao ◽  
Jingjing Xia ◽  
Weibao Qiu ◽  
Hairong Zheng
Keyword(s):  
Plane Wave ◽  
Linear Array ◽  
Array Transducer ◽  
Wave Imaging

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

2013 ◽  
Author(s):  
Bruno-Felix Osmanski ◽  
Gabriel Montaldo ◽  
Mathias Fink ◽  
Mickael Tanter
Keyword(s):  
Plane Wave ◽  
Doppler Imaging ◽  
Out Of Plane ◽  
Wave Imaging

scholarly journals Multiplexed ultrasound beam summation for side lobe reduction

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Asaf Ilovitsh ◽  
Tali Ilovitsh ◽  
Katherine W. Ferrara
Keyword(s):  
Image Quality ◽  
Focal Depth ◽  
Side Lobe ◽  
Beam Shaping ◽  
Center Frequency ◽  
Improve Image Quality ◽  
Array Transducer ◽  
Conventional Ultrasound ◽  
Single Focus

Abstract Two-way focusing, which relies on sweeping a focused beam across a field of view, is the conventional method for performing high-quality ultrasound imaging. Side lobes resulting from diffraction reduce the image contrast, thus degrade the image quality. In this paper, we present a new method for beam shaping the transmitted ultrasound waveform in order to reduce side lobes and improve image quality. The beam shaping is achieved by transmitting two different waveforms that are interlaced between the odd and even elements. One waveform generates a standard diffraction-limited single focus, and the second waveform generates two foci at the same focal depth as the single focus. The distance between the two foci is selected such that they will destructively interfere with the first order side lobes of the single focus, effectively eliminating these side lobes. A 7.5 dB side lobe reduction was measured experimentally at a depth of 60 mm, using a phased array transducer with a center frequency of 3 MHz. This real-time method utilizes standard receive beamforming, identical to traditional two-way focusing, and does not require post-processing. The method can be implemented with conventional ultrasound systems, without the need for additional components. The proposed method is described analytically, optimized via numerical simulation, and validated by experiments using wire targets, tissue-mimicking phantoms, and in vivo imaging of the rat bladder.

scholarly journals Efficient Transmit Delay Calculation in Ultrasound Coherent Plane-Wave Compound Imaging for Curved Array Transducers

2019 ◽  
Vol 9 (13) ◽  
pp. 2752
Author(s):  
Dooyoung Go ◽  
Jinbum Kang ◽  
Ilseob Song ◽  
Yangmo Yoo
Keyword(s):  
Computational Complexity ◽  
Plane Wave ◽  
Frame Rate ◽  
Steering Angle ◽  
In Vivo Experiments ◽  
Array Transducer ◽  
Multiple Plane ◽  
Curved Array Transducer ◽  
New Applications

The recently introduced plane-wave compounding method based on multiple plane-wave excitation has enabled several new applications due to its high frame rate (>1000 Hz). In this paper, a new efficient transmit delay calculation method in plane-wave compound imaging for a curved array transducer is presented. In the proposed method, the transmit delay is only calculated for a steering angle of 0° and is shifted along the element of the transducer to obtain other transmit delays for different steering angles. To evaluate the performance of the proposed method, the computational complexity was measured for various transmission conditions. For the number of elements and plane-wave excitations of 128 and 65, respectively, the number of operations was substantially decreased in the proposed method compared with the conventional method (256 vs. 8320). The benefits of the proposed method were demonstrated with phantom and in vivo experiments, where coherent plane-wave compounding with 65 excitations provided larger CR and CNR values compared to nine excitations (−22.5 dB and 2.7 vs. −11.3 dB and 1.9, respectively). These results indicate the proposed method can effectively reduce the computational complexity for plane-wave compound imaging in curved array transducers.

Ultrasound Contrast Plane Wave Imaging Based on Bubble Wavelet Transform: In Vitro and In Vivo Validations

2016 ◽  
Vol 42 (7) ◽  
pp. 1584-1597 ◽  
Author(s):  
Diya Wang ◽  
Yujin Zong ◽  
Xuan Yang ◽  
Hong Hu ◽  
Jinjin Wan ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Plane Wave ◽  
Ultrasound Contrast ◽  
Wave Imaging

scholarly journals 2-D Minimum Variance Based Plane Wave Compounding with Generalized Coherence Factor in Ultrafast Ultrasound Imaging

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4099 ◽  
Author(s):  
Yanxing Qi ◽  
Yuanyuan Wang ◽  
Jinhua Yu ◽  
Yi Guo
Keyword(s):  
Plane Wave ◽  
Ultrasound Imaging ◽  
Contrast Ratio ◽  
Minimum Variance ◽  
Frame Rate ◽  
In Vivo Studies ◽  
Coherence Factor ◽  
Wave Imaging ◽  
Phantom Experiments

Plane wave compounding (PWC) is an effective modality for ultrafast ultrasound imaging. It can provide higher resolution and better noise reduction than plane wave imaging (PWI). In this paper, a novel beamformer integrating the two-dimensional (2-D) minimum variance (MV) with the generalized coherence factor (GCF) is proposed to maintain the high resolution and contrast along with a high frame rate for PWC. To specify, MV beamforming is adopted in both the transmitting aperture and the receiving one. The subarray technique is therefore upgraded into the sub-matrix division. Then, the output of each submatrix is used to adaptively compute the GCF using a 2-D fast Fourier transform (FFT). After the 2-D MV beamforming and the 2-D GCF weighting, the final output can be obtained. Results of simulations, phantom experiments, and in vivo studies confirm the advantages of the proposed method. Compared with the delay-and-sum (DAS) beamformer, the full width at half maximum (FWHM) is 90% smaller and the contrast ratio (CR) improvement is 154% in simulations. The over-suppression of desired signals, which is a typical drawback of the coherence factor (CF), can be effectively avoided. The robustness against sound velocity errors is also enhanced.

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