Adaptive Spectral Sensitive Filter for Tissue Harmonic Imaging

概要

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Developments of tissue and contrast harmonics imaging in medical ultrasound technologies have enabled the display of low-contrast tissue structures that have not been previously recognized using conventional B-mode imaging. Images are constructed using harmonics generated while transmitted ultrasonic waves propagate through the tissue. Two techniques can be used to achieve this: the first uses a band-pass digital filter for the harmonic frequency band, and the second applies two consecutive transmit pulses that are 180° out of phase. In the present study, an alternative technique for tissue harmonic imaging is proposed. A pair of adaptive filters is employed for each receiving RF signal acquired by the ultrasonic transducer array. The technique uses a single transmit pulse but cancels out the fundamental frequency of the received signal by appropriately changing the delay terms of the adaptive filters. The resulting signal is improved at the second harmonic frequency. In order to meet the optimum design requirements, 9-tap delays are applied to each adaptive filter.
Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
2003-01-15