scholarly journals Multispectral photoacoustic coded excitation imaging using unipolar orthogonal Golay codes

2010 ◽  
Vol 18 (9) ◽  
pp. 9076 ◽  
Author(s):  
Martin P. Mienkina ◽  
Claus-Stefan Friedrich ◽  
Nils C. Gerhardt ◽  
Martin F. Beckmann ◽  
Martin F. Schiffner ◽  
...  
Keyword(s):  
Coded Excitation ◽  
Golay Codes

Simulation study of photoacoustic coded excitation using Golay Codes

2008 ◽  
Author(s):  
Martin P. Mienkina ◽  
Annika Eder ◽  
Georg Schmitz ◽  
Claus-Stefan Friedrich ◽  
Nils C. Gerhardt ◽  
...  
Keyword(s):  
Simulation Study ◽  
Coded Excitation ◽  
Golay Codes

Feasibility study of multispectral photoacoustic coded excitation using orthogonal unipolar Golay codes

2009 ◽  
Author(s):  
Martin P. Mienkina ◽  
Annika Eder ◽  
Georg Schmitz ◽  
Claus-Stefan Friedrich ◽  
Nils C. Gerhardt ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Coded Excitation ◽  
Golay Codes

Experimental evaluation of photoacoustic coded excitation using unipolar golay codes

2010 ◽  
Vol 57 (7) ◽  
pp. 1583-1593 ◽  
Author(s):  
Martin Mienkina ◽  
Claus-Stefan Friedrich ◽  
Nils Gerhardt ◽  
Wilko Wilkening ◽  
Martin Hofmann ◽  
...  
Keyword(s):  
Experimental Evaluation ◽  
Coded Excitation ◽  
Golay Codes

scholarly journals Coded Excitation for Crosstalk Suppression in Multi-line Transmit Beamforming: Simulation Study and Experimental Validation

2019 ◽  
Vol 9 (3) ◽  
pp. 486 ◽  
Author(s):  
Ling Tong ◽  
Qiong He ◽  
Alejandra Ortega ◽  
Alessandro Ramalli ◽  
Piero Tortoli ◽  
...  
Keyword(s):  
Simulation Study ◽  
Experimental Validation ◽  
Phased Array ◽  
Added Value ◽  
Synthetic Aperture ◽  
Cardiac Ultrasound ◽  
Transmit Beamforming ◽  
Coded Excitation ◽  
Golay Codes ◽  
Focused Beams

(1) Background: Multi-line transmit (MLT) beamforming has been proposed for fast cardiac ultrasound imaging. While crosstalk between MLT beams could induce artifacts, a Tukey (α = 0.5)-Tukey (α = 0.5) transmit-receive (TT-) apodization can largely—but not completely—suppress this crosstalk. Coded excitation has been proposed for crosstalk suppression, but only for synthetic aperture imaging and multi-focal imaging on linear/convex arrays. The aim of this study was to investigate its (added) value to suppress crosstalk among simultaneously transmitted multi-directional focused beams on a phased array; (2) Methods: One set of two orthogonal Golay codes, as well as one set of two orthogonal chirps, were applied on a two, four, and 6MTL imaging schemes individually. These coded schemes were investigated without and with TT-apodization by both simulation and experiments; and (3) Results: For a 2MLT scheme, without apodization the crosstalk was removed completely using Golay codes, whereas it was only slightly suppressed by chirps. For coded 4MLT and 6MLT schemes, without apodization crosstalk appeared as that of non-apodized 2MLT and 3MLT schemes. TT-apodization was required to suppress the remaining crosstalk. Furthermore, the coded MLT schemes showed better SNR and penetration compared to that of the non-coded ones. (4) Conclusions: The added value of orthogonal coded excitation on MLT crosstalk suppression remains limited, although it could maintain a better SNR.

scholarly journals Convolution of Barker and Golay Codes for Low Voltage Ultrasonic Testing

Technologies ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 72
Author(s):  
Zeng Fan ◽  
John Rudlin ◽  
Giorgos Asfis ◽  
Hongying Meng
Keyword(s):  
Ultrasonic Testing ◽  
Low Voltage ◽  
Imaging System ◽  
Signal To Noise Ratio ◽  
Main Lobe ◽  
Golay Code ◽  
Coded Excitation ◽  
High Attenuation ◽  
Golay Codes ◽  
Barker Code

Ultrasonic Testing (UT) is one of the most important technologies in Non-Detective Testing (NDT) methods. Recently, Barker code and Golay code pairs as coded excitation signals have been applied in ultrasound imaging system with improved quality. However, the signal-to-noise ratio (SNR) of existing UT system based on Barker code or Golay code can be influenced under high high attenuation materials or noisy conditions. In this paper, we apply the convolution of Barker and Golay codes as coded excitation signals for low voltage UT devices that combines the advantages of Barker code and Golay code together. There is no need to change the hardware of UT system in this method. The proposed method has been analyzed theoretically and then in extensive simulations. The experimental results demonstrated that the main lobe level of the code produced by convolution of Barker code and Golay code pairs is much higher than the simple pulse and the main lobe of the combined code is higher than the traditional Barker code, sidelobe is the same as the baker code that constitutes this combined code. So the peak sidelobe level (PSL) of the combined code is lower than the traditional Barker code. Equipped with this, UT devices can be applied in low voltage situations.

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