METHOD FOR IMAGING STRUCTURE DEFECT, DEVICE FOR IMAGING STRUCTURE DEFECT, METHOD FOR IMAGING BUBBLE OR LESION, AND DEVICE FOR IMAGING BUBBLE OR LESION

摘要

An imaging method of a structure defect and an imaging device of a structure defect that have high frequency resolution and spatial resolution and can improve discrimination between a closed crack and an open crack are provided. Also, an imaging method of a bubble or a lesion and an imaging device of a bubble or a lesion that have high frequency resolution and spatial resolution and can improve discrimination between a tissue and a bubble as well as a lesion are provided. As for a defect, scattered waves from the defect of burst ultrasonic waves radiated from an ultrasonic transmitter to a structure in two different arrangements of the ultrasonic transmitter and an array receiver are received by the array receiver so as to obtain a reception signal. The reception signal is subjected to a band-pass filter that passes a specific frequency component, shifted by different time according to the position of each reception sensor element of the array receiver and then, added so as to obtain a processing signal. On the basis of the processing signal, an image of the defect is obtained, respectively. A common portion of the obtained two images is extracted.