Patent ID: 7354400

Claim:
An ultrasonographic method, comprising: a first encoding transmission/reception step for sequentially modulating a fundamental wave with a code set including a plurality of modulation codes in which at least two are in complementary relationship, and outputting an encoding drive signal to a probe and transmitting an ultrasonic beam and demodulating each reception signal output from the probe with demodulation codes corresponding to the modulation codes in the code set; a step for obtaining a first synthesis signal by synthesizing demodulation signals resulting from the demodulation in the first encoding transmission/reception step; a second encoding transmission/reception step for sequentially modulating a fundamental wave with a reverse code set including a plurality of modulation codes in reverse order of the modulation codes in the code set, and outputting an encoding drive signal wave to the probe and transmitting an ultrasonic beam and demodulating each reception signal output from the probe with demodulation codes corresponding to the modulation codes in the reverse code set; a step for obtaining a second synthesis signal by synthesizing demodulation signals resulting from the demodulation in the second encoding transmission/reception step; a step for obtaining a third synthesis signal by synthesizing the first synthesis signal and the second synthesis signal; and a step for reconstructing an ultrasonograph based on the third synthesis signal.