Investigation on effect of transmit condition on ultrasonic measurement of 2D motion velocity

2022 ◽  
Author(s):  
Tatsuya Yano ◽  
Michiya Mozumi ◽  
Masaaki Omura ◽  
Ryo Nagaoka ◽  
Hideyuki Hasegawa
Keyword(s):  
Ultrasonic Waves ◽  
Transmission Conditions ◽  
Block Matching ◽  
High Temporal Resolution ◽  
Beam Method ◽  
Wave Imaging ◽  
Phase Sensitive ◽  
Single Emission ◽  
Focused Beam ◽  
Tissue Motion

Abstract A phase-sensitive 2D motion estimator is useful for measurement of minute tissue motion. However, the effect of conditions for emission of ultrasonic waves on the accuracy of such an estimator has not been investigated thoroughly. In the present study, the accuracy of the phase-sensitive 2D motion estimator was evaluated under a variety of transmission conditions. Although plane wave imaging with a single emission per frame achieved an extremely high temporal resolution of 10417 Hz, the accuracy in estimation of lateral velocities was worse than compound-based method or focused-beam method. By contrast, the accuracy in estimation of axial velocities hardly depended on the transmission conditions. Also, the phase-sensitive 2D motion estimator was combined with the block matching method to estimate displacements larger than the ultrasonic wavelength. Furthermore, the results show that the correlation coefficient in block matching has potential to be used for evaluation of the reliability of the estimated velocity.

Thermal wave imaging with phase sensitive modulated thermography

1992 ◽  
Vol 71 (8) ◽  
pp. 3962-3965 ◽  
Author(s):  
G. Busse ◽  
D. Wu ◽  
W. Karpen
Keyword(s):  
Thermal Wave ◽  
Wave Imaging ◽  
Phase Sensitive ◽  
Thermal Wave Imaging

Low-Frequency Elastic Wave Imaging by Adaptive Combination of Fundamental and Tissue Harmonic Ultrasonic Waves

2003 ◽  
Vol 42 (Part 1, No. 5B) ◽  
pp. 3271-3275 ◽  
Author(s):  
Nobuyuki Masuda ◽  
Takehiro Tsujita ◽  
Tomoaki Ebuchi ◽  
Yoshiki Yamakoshi
Keyword(s):  
Elastic Wave ◽  
Low Frequency ◽  
Ultrasonic Waves ◽  
Adaptive Combination ◽  
Wave Imaging

RL Algorithm for Passive Millimeter Wave Imaging Based on BM3D

2013 ◽  
Vol 411-414 ◽  
pp. 1155-1158 ◽  
Author(s):  
Yi Ming Niu ◽  
Can Cui ◽  
Guo Yang ◽  
Wen Wu
Keyword(s):  
Millimeter Wave ◽  
Imaging System ◽  
Block Matching ◽  
Transform Domain ◽  
Nonlinear Method ◽  
Millimeter Wave Imaging ◽  
Wave Imaging ◽  
Influence Of Noise ◽  
Modified Algorithm ◽  
Passive Millimeter Wave Imaging

In a passive millimeter wave (PMMW) imaging system, the resolution of the acquired image is limited by the antenna size. The Richardson—Lucy (RL) algorithm is a simple and nonlinear method, which can improve the resolution of the image. However, when the noise can not be neglected, it is difficult for RL algorithm to get good restoration of the corrupted image. To the best of our knowledge, the block-matching with 3D transform domain collaborative filtering (BM3D) algorithm achieves very good performance in image de-noising. In order to improve the resolution of passive millimeter wave images, a RL imaging algorithm for passive millimeter wave based on BM3D is proposed in this paper. The modified algorithm effectively reduces the influence of noise on RL algorithm by using de-noise algorithm based on BM3D. Experimental results demonstrate that the proposed algorithm improves the performance of RL algorithm. Furthermore, the algorithm can be easily implemented for passive millimeter wave imaging．

Применение технологии Plane Wave Imaging в ультразвуковом неразрушающем контроле

2021 ◽  
Vol 6 ◽  
pp. 3-16
Author(s):  
Е.Г. Базулин ◽  
И.В. Евсеев
Keyword(s):  
Plane Wave ◽  
Antenna Array ◽  
Plane Waves ◽  
Control Object ◽  
Ultrasonic Waves ◽  
Image Recovery ◽  
Phased Array Antenna ◽  
Wave Type ◽  
Wave Imaging ◽  
Object Of Control

Image recovery of reflectors by digital antenna focusing (DFA), along with such advantages as high resolution over the entire image recovery area of reflectors, the ability to obtain images taking into account the reflection and transformation of the wave type from the boundaries of the object of control, has several disadvantages: a large volume of measured echo signals, a long image recovery time and insufficient energy of ultrasonic waves introduced into the object of control. The Plane Wave Imaging (PWI) method allows you to combine the advantages of phased array antenna technology (PHAR) and CFA technology. In the PWI mode, when a plane wave is emitted, all elements of the antenna array (AP) work, as in the FAR mode, which allows you to increase the energy introduced into the control object, and echo signals are recorded by all elements of the AP, as in the CFA mode. The image of the reflectors is restored by the raman SAFT method. To obtain an image, you can use the number of radiated plane waves less than the number of elements of the antenna array, which reduces the volume of measured echo signals. Translation of calculations to the area of spatial sectors allows you to increase the speed of recovery of the presentation of reflectors. Model experiments have shown the positive and negative aspects of obtaining images of reflectors by the PWI method in comparison with the CFA method, both for the case of using a prism and without a prism.

scholarly journals Ultrasound Array Probe: Signal Processing in Case of Structural Noise

2020 ◽  
Vol 3 (4) ◽  
Author(s):  
Paul Nicolas ◽  
Kassis Paul ◽  
Ferre Antoine ◽  
Schumm Andreas ◽  
Lhuillier Pierre-Emile
Keyword(s):  
Ultrasonic Waves ◽  
Statistical Properties ◽  
Coarse Grained ◽  
Structural Noise ◽  
Complex Materials ◽  
Near Surface ◽  
Post Process ◽  
Imaging Results ◽  
Array Probe ◽  
Wave Imaging

Abstract This work focuses on non-destructive examinations using array probe ultrasonic waves on complex materials generating a high structural noise on the examined area. During an ultrasonic examination, multiple scattering of the ultrasonic waves at the grain boundaries makes the distinction between this structurally induced noise and a potential defect challenging. The difficulty of the interpretation can moreover be increased in the near surface area because of the subsurface wave. In order to ease the analysis of these acquisitions, some numerical processing methods are proposed. Statistical properties of the imaging results (for instance, total focusing method or plane wave imaging) are first calculated on several sensor positions. These statistical properties are then used to post-process the imaging results and enhance any signal values that do not belong to the structural noise expected statistics. The method, called “CORUS,” has been successfully tested on cast austenoferritic stainless steel coarse-grained mock-ups, with several dB gain compared to the classical total focusing method. It is now integrated in a civa software plugin and in a prototype version of the real-time PANTHER-phased-array acquisition system from Eddyfi Technologies.

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