Improved Spatial Resolution in a Three-Dimensional Acoustic Medical Imaging System Based on a Hybrid Method Using a Synthetic Aperture Technique

概要

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For an acoustic real-time three-dimensional (3-D) imaging system with high spatial resolution, we propose a system based on a hybrid method using a synthetic aperture technique. We can change the transmit point in this system; thus, the coherent integration of multiple receive signals from different transmit points improves spatial resolution using a synthetic aperture technique. In the case of a time resolution of 300 3-D images/s, the $-3$ dB lateral resolution of the proposed system is 1.30 $\lambda$ in the $x$–$z$ section and 1.17 $\lambda$ in the $y$–$z$ section for a 0.07 m depth, where the lateral resolution is improved from 16 transmit and receive events. The number of elements can be reduced to about 1/7.5 of a dense two-dimensional (2-D) array of a digital beamforming imager having the same time and spatial resolution.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-07-30