PROJECT TITLE :

Orthogonal Golay Codes With Local Beam Pattern Correction in Ultrasonic Imaging

ABSTRACT:

The goal of this study is to improve the synthetic transmit aperture (STA) imaging technique by employing the transducer array component beam pattern correction combined with emission of mutually orthogonal complementary Golay sequences. The transmit-receive scheme based mostly on simultaneous emission of various Golay pairs by adjacent transmit subapertures is implemented to decrease the image reconstruction time. A temporary discussion on the fundamentals of the orthogonal Golay complementary sequences is provided and their blessings for the STA imaging technique are demonstrated. The performance of the developed approach was tested using FIELD II simulated synthetic aperture knowledge from the purpose reflectors, that allowed to estimate both; the penetration depth and therefore the lateral resolution. In the work the 128 element, five MHz, linear array transducer was used. The obtained results showed that the applying the beam pattern correction results in the image quality improvement in the vicinity of the transducer face. Specifically, the noise level evaluated between the point reflectors at the depth of four mm decreased from - fourteen.one dB for the case of omnidirectional source to - thirty eight.seven dB when the element beam pattern correction was implemented. The simulation proved that the imaging quality was improved considerably.


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