23 May 2003 Synthetic sinc wave in ultrasonic imaging system
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Synthetic sinc wave employs pulsed plane waves as a transmit beam with linear time delay curve. The received echoes in different transmit directions at different transmit times are superposed at imaging points with proper time delay compensation using synthetic focusing scheme. This scheme, which uses full aperture on transmit, obtains a high SNR image, and also features high lateral resolution by using two-way dynamic focusing at all imaging depths. In this paper, we consider the realization problem of the synthetic sinc wave. It is experimentally explored by obtaining phantom and in vivo data with a linear array of 5 MHz. The phantom experiments indicate that the synthetic sinc wave maintains a high resolution over a more extended imaging depth than conventional fixed point transmit and dynamic receive focusing schemes. In vivo images show that the resolution of the synthetic sinc wave does not exceed the conventional focusing systems because of tissue motion, phase aberration, or both, but that the frame rate can be increased by a factor of more than five compared to the conventional focusing schemes, while maintaining competitive resolution at all imaging depths.
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Mok-Kun Jeong, Mok-Kun Jeong, Sung-Jae Kwon, Sung-Jae Kwon, "Synthetic sinc wave in ultrasonic imaging system", Proc. SPIE 5035, Medical Imaging 2003: Ultrasonic Imaging and Signal Processing, (23 May 2003); doi: 10.1117/12.479880; https://doi.org/10.1117/12.479880

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