scholarly journals C2.1 - Ultrasound imaging through multimode waveguides using time reversal virtual array method

2017 ◽  
Author(s):  
M. Kalibatas ◽  
R. Nauber ◽  
D. Dawidowski ◽  
L. Büttner ◽  
J. Czarske
Keyword(s):  
Ultrasound Imaging ◽  
Time Reversal ◽  
Virtual Array ◽  
Multimode Waveguides

scholarly journals Non-invasive aberration correction and adaptive ultrasound imaging with a time reversal virtual array

2021 ◽  
Vol 88 (s1) ◽  
pp. s34-s36
Author(s):  
Lars Grüter ◽  
Richard Nauber ◽  
Jürgen Czarske
Keyword(s):  
Time Reversal ◽  
Model Experiment ◽  
Calibration Method ◽  
Wavefront Correction ◽  
Non Invasive ◽  
Numerical Characterization ◽  
Virtual Array ◽  
Multi Mode ◽  
Method Show

Abstract Strong acoustical aberrations such as induced by multi-mode waveguides or the human skull can significantly reduce the quality of or prevent effective ultrasoundbased imaging. We propose a novel non-invasive calibration method that utilizes two independent acoustical accesses and a time reversal virtual array (TRVA) for adaptive wavefront correction. Numerical characterization and a model experiment utilizing this method show an improvement of the lateral resolution and the peak to background ratio by up to 35% and 10% respectively.

Time reversal ultrasound focusing through multimode waveguides

2017 ◽  
Vol 84 (9) ◽  
Author(s):  
David Dawidowski ◽  
Richard Nauber ◽  
Lars Büttner ◽  
Jürgen Czarske
Keyword(s):  
Time Reversal ◽  
Sound Propagation ◽  
Focus Ultrasound ◽  
Casting Process ◽  
Spatial Separation ◽  
Measuring Volume ◽  
Phased Array Ultrasound ◽  
Element Array ◽  
Array Ultrasound ◽  
Multimode Waveguides

AbstractUltrasound imaging in harsh environments, such as the continuous steel casting process, benefits from a spatial separation of sensors and measuring volume to avoid damaging e.g. because of high temperatures. This can be achieved through acoustical multimode waveguides. To focus ultrasound in the measuring volume despite the complex sound propagation, we propose using the time reversal technique. We present numerical simulations and experiments using the phased array ultrasound Doppler velocimeter to focus through a water filled waveguide with a 64 element array. A resolution in the millimetre range is achieved for a 68 mm long waveguide.

Feasibility of Time Reversal Acoustics in Diagnostic Ultrasound Imaging

2008 ◽  
Author(s):  
Won-Suk Ohm ◽  
Bengt Enflo ◽  
Claes M. Hedberg ◽  
Leif Kari
Keyword(s):  
Ultrasound Imaging ◽  
Time Reversal ◽  
Diagnostic Ultrasound ◽  
Time Reversal Acoustics
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