Ultrasonic image construction method, apparatus and signal-processing method

Abstract

This invention provides a signal-processing method that makes it possible to acquire, relatively easily and surely, a highly reliable normalized impulse-response signal without relying on the signal-correction processing after normalization. The signal-processing method of this invention includes a low-frequency extraction step, a high-frequency extraction step and a synthesizing step. In the low-frequency extraction step, only the low-frequency component is extracted from the spectrum of the first normalized signal NSobtained by normalizing the target signal Sin the time domain. In the high-frequency extraction step, only the high-frequency component is extracted from the spectrum of the second normalized signal NSobtained by normalizing the target signal Sin the frequency domain using the reference signal S. In the synthesizing step, the low-frequency component, derived from the first normalized signal NS, and the high-frequency component, derived from the second normalized signal NS, are synthesized to obtain a normalized impulse-response signal NS.