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Proceedings Paper

Coded excitation with sigma-delta sampling for medical ultrasound imaging
Author(s): Yang Mo Yoo; Ji Cao; Liang Mong Koh; Yongmin Kim
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Paper Abstract

We have developed a new coded excitation technique where sigma-delta sampling and the corresponding single-bit pre-compression are utilized to reduce hardware complexity while improving signal-to-noise ratio (SNR) and penetration. From phantom studies, we have obtained a 10.03 dB SNR improvement with the proposed sigma-delta sampling-based coded excitation (SDS-CE) system compared to the conventional pulse-echo excitation method at the same voltage level. This improvement allows the necessary voltage level for the SDS-CE to be lowered to one sixth (e.g., ±10 V) of that for the conventional pulse-echo excitation method with the excitation voltage of ±60 V to achieve a comparable SNR and penetration depth. To evaluate the hardware complexity in the proposed method, the number of gates was estimated based on the 0.35-μm CMOS fabrication process. The proposed SDS-CE method can save 55.4%, 79.0% and 56.8% gates needed compared to the conventional pulse-echo method and the coded excitation method based on pre and post-compression, respectively. The proposed SDS-CE could lead to the integration of the transmitter and receiver circuitries into a single chip due to the improved SNR and reduced hardware complexity.

Paper Details

Date Published: 16 March 2006
PDF: 10 pages
Proc. SPIE 6147, Medical Imaging 2006: Ultrasonic Imaging and Signal Processing, 61470W (16 March 2006); doi: 10.1117/12.654114
Show Author Affiliations
Yang Mo Yoo, Univ. of Washington (United States)
Ji Cao, Nanyang Technological Univ. (Singapore)
Liang Mong Koh, Nanyang Technological Univ. (Singapore)
Yongmin Kim, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 6147:
Medical Imaging 2006: Ultrasonic Imaging and Signal Processing
Stanislav Emelianov; William F. Walker, Editor(s)

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