Dr. Ji Cao Profile

Dr. Ji Cao

at Nanyang Technological Univ

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Proceedings Article | 16 March 2006 Paper

Coded excitation with sigma-delta sampling for medical ultrasound imaging

Yang Mo Yoo, Ji Cao, Liang Mong Koh, Yongmin Kim

Proceedings Volume 6147, 61470W (2006) https://doi.org/10.1117/12.654114

KEYWORDS: Signal to noise ratio, Ultrasonography, Modulators, Transducers, Neodymium, Image quality, Receivers, Transmitters, Near field, Signal attenuation

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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.

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