Multi-Beam Simultaneous Transmit Multi-Zone (MB-STMZ) focusing method using modulated orthogonal codes for ultrasound imaging

Bae-Hyung Kim; Tai-Kyong Song

doi:10.1117/12.535317

28 April 2004 Multibeam Simultaneous Transmit Multizone (MB-STMZ) focusing method using modulated orthogonal codes for ultrasound imaging

Bae-Hyung Kim, Tai-Kyong Song

Author Affiliations +

Proceedings Volume 5373, Medical Imaging 2004: Ultrasonic Imaging and Signal Processing; (2004) https://doi.org/10.1117/12.535317
Event: Medical Imaging 2004, 2004, San Diego, California, United States

Abstract

In this paper, a novel method for simultaneous transmit multi-zone (STMZ) focusing along multiple scan lines using modulated orthogonal codes is presented. In this method, M mutually orthogonal Golay codes are transmitted along M respective directions to obtain M scan lines simultaneously, where each Golay code consists of M complementary sequences. This implies that along each scan direction M complementary sequences comprising one of the Golay code are to be fired sequentially. Therefore, total M transmit and receive (T/R) events are required to obtain M scan lines. In the proposed method, however, each complementary code is convolved with the sum of L orthogonal chirps that are focused at L different depths. Consequently, the proposed method requires M T/R events to obtain M scan lines with L transmit foci each, whereas ML T/R events are required in conventional pulse echo imaging. After M firings, first the M orthogonal Golay codes are separately compressed, secondly each compressed Golay signal is correlated with L respective orthogonal chirps, and finally the L compressed chirp signals are independently focused and combined to provide the dynamically focused beams along M scan lines, each with multi-zone transmit foci. Experimental results with a 7.5MHz linear array, for M=L=2, showed that the proposed method can provide ultrasound images with higher frame rates and significantly improved SNR compared to conventional multi-zone focusing methods using short pulses.

Citation Download Citation

Bae-Hyung Kim and Tai-Kyong Song "Multibeam Simultaneous Transmit Multizone (MB-STMZ) focusing method using modulated orthogonal codes for ultrasound imaging", Proc. SPIE 5373, Medical Imaging 2004: Ultrasonic Imaging and Signal Processing, (28 April 2004); https://doi.org/10.1117/12.535317

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