| 摘要 |
PROBLEM TO BE SOLVED: To draw a clear image by reducing an image quality deterioration at the deep section of a subject. SOLUTION: Ultrasonic wave are transmitted in the same direction by driving an ultrasonic wave transducer 21 which transmits/receives ultrasonic waves by driving pulses of different voltages by a transmitting section 1. Then, the fundamental wave of the reflected signal is received by a fundamental wave- receiving section 3, and at least one of the received signals of the fundamental waves based on the driving pulses of the different voltages is coefficient- multiplied by coefficient circuits 41 and 42. Then, a difference between both signals is obtained by a difference circuit 43. By this constitution, the influence of a side lobe is eliminated, and the image quality at the deep section of the subject is greatly improved, and a clear image can be drawn. |
