scholarly journals Ultrasonic imaging of subsurface objects using photorefractive dynamic holography

2001 ◽  
Author(s):  
Vance A. Deason ◽  
Kenneth L. Telschow ◽  
Scott M. Watson
Keyword(s):  
Ultrasonic Imaging ◽  
Dynamic Holography

14-Fluoro-Bacteriorhodopsin Gelatin Films for Dynamic Holography Recording¶

2005 ◽  
Vol 81 (4) ◽  
pp. 920 ◽  
Author(s):  
Elena Korchemskaya ◽  
Nikolai Burykin ◽  
Angel de Lera ◽  
Rosana Alvarez ◽  
Sergey Pirutin ◽  
...  
Keyword(s):  
Dynamic Holography ◽  
Gelatin Films

Ultrasonic Block Compressed Sensing Imaging Reconstruction Algorithm Based on Wavelet Sparse Representation

2020 ◽  
Vol 16 (3) ◽  
pp. 262-272
Author(s):  
Guangzhi Dai ◽  
Zhiyong He ◽  
Hongwei Sun
Keyword(s):  
Compressed Sensing ◽  
Sparse Representation ◽  
Linear Array ◽  
Imaging System ◽  
Ultrasonic Imaging ◽  
Large Data ◽  
Reconstruction Algorithm ◽  
Array Transducer ◽  
Total Data ◽  
Block Compressed Sensing

Background: This study is carried out targeting the problem of slow response time and performance degradation of imaging system caused by large data of medical ultrasonic imaging. In view of the advantages of CS, it is applied to medical ultrasonic imaging to solve the above problems. Objective: Under the condition of satisfying the speed of ultrasound imaging, the quality of imaging can be further improved to provide the basis for accurate medical diagnosis. Methods: According to CS theory and the characteristics of the array ultrasonic imaging system, block compressed sensing ultrasonic imaging algorithm is proposed based on wavelet sparse representation. Results: Three kinds of observation matrices have been designed on the basis of the proposed algorithm, which can be selected to reduce the number of the linear array channels and the complexity of the ultrasonic imaging system to some extent. Conclusion: The corresponding simulation program is designed, and the result shows that this algorithm can greatly reduce the total data amount required by imaging and the number of data channels required for linear array transducer to receive data. The imaging effect has been greatly improved compared with that of the spatial frequency domain sparse algorithm.

Controllable Hydrogen Release for Gas-assisted Chemotherapy and Ultrasonic Imaging of Drug-resistant Tumors

2021 ◽  
pp. 129917
Author(s):  
Yeying Wang ◽  
Yang Liu ◽  
Jing-e Zhou ◽  
Lizhou Lin ◽  
Chao Jia ◽  
...  
Keyword(s):  
Ultrasonic Imaging ◽  
Hydrogen Release ◽  
Drug Resistant

scholarly journals Ultrasonic Imaging of Thick Carbon Fiber Reinforced Polymers through Pulse-Compression-Based Phased Array

2021 ◽  
Vol 11 (4) ◽  
pp. 1508
Author(s):  
Muhammad Khalid Rizwan ◽  
Stefano Laureti ◽  
Hubert Mooshofer ◽  
Matthias Goldammer ◽  
Marco Ricci
Keyword(s):  
Carbon Fiber ◽  
Pulse Compression ◽  
Phased Array ◽  
Signal To Noise Ratio ◽  
Near Field ◽  
Ultrasonic Imaging ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Custom Made ◽  
Carbon Fiber Reinforced

The use of pulse-compression in ultrasonic non-destructive testing has assured, in various applications, a significant improvement in the signal-to-noise ratio. In this work, the technique is combined with linear phased array to improve the sensitivity and resolution in the ultrasonic imaging of highly attenuating and scattering materials. A series of tests were conducted on a 60 mm thick carbon fiber reinforced polymer benchmark sample with known defects using a custom-made pulse-compression-based phased array system. Sector scan and total focusing method images of the sample were obtained with the developed system and were compared with those reconstructed by using a commercial pulse-echo phased array system. While an almost identical sensitivity was found in the near field, the pulse-compression-based system surpassed the standard one in the far-field producing a more accurate imaging of the deepest defects and of the backwall of the sample.

Laser mode manipulation by intracavity dynamic holography: Application to mode selection

1999 ◽  
Vol 69 (2) ◽  
pp. 155-157 ◽  
Author(s):  
N. Huot ◽  
J.M. Jonathan ◽  
G. Pauliat ◽  
P. Georges ◽  
A. Brun ◽  
...  
Keyword(s):  
Mode Selection ◽  
Laser Mode ◽  
Dynamic Holography
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