| 摘要 |
PROBLEM TO BE SOLVED: To enable a system to be used in higher harmonic imaging in the both cases that a contrast medium is present and is absent by making the sum of the correlation of a first transmission code for a first reception code and the correlation of a second transmission code for a second reception code equal to zero. SOLUTION: In first transmission firing, a basic wavelent 52 is convolved by a first transmission code (X code 1), a first transmission signal 54 is prepared and a filtered signal 56 is prepared when its prefect copy is correlated with the first reception code (R code 1). In second transmission firing, a second transmission code (X code 2) is convolved by the basic wavelet 52, a second transmission signal 57 is prepared and when its perfect copy is correlated with a second reception code (R code 2) by the correlative filter, the filtered signal 60 is prepared. When the filtered signals 56 and 60 are added, a pulse being zero in the size is generated. |
