PURPOSE: A medical diagnostic device is provided to improve the quality of an image by a phase rotation of the same size at each frequency component of a receiving signal in a beam foaming process.CONSTITUTION: A first filter(410) and a second filter(420) respectively extract a first band signal and a second band signal from an object. A first mixer(430) outputs a first mixing signal by mixing an oscillation signal with a first phase difference with the first band signal. A second mixer(440) outputs a second mixing signal by mixing an oscillation signal with a second phase difference with the second band signal. A first low pass filter(450) generates a first low band output by extracting a low frequency band component from the first mixing signal. A second low pass filter(460) generates a second low band output by extracting a low frequency band component from the second mixing signal. A third mixer(470) outputs a third mixing signal by mixing the first low band output with an oscillation signal with the same phase as a modulation frequency and the receiving signal. A fourth mixer(480) outputs a fourth mixing signal by mixing the second low band output with the oscillation signal with the same phase as the modulation frequency and the receiving signal. A beam foaming signal generating unit(490) generates a beam foaming signal by adding the third mixing signal to the fourth mixing signal.COPYRIGHT KIPO 2012본 발명의 실시예는 의료진단장치에 관한 것이다. 본 발명의 실시예에 따른 의료진단장치는 대상체로부터 반사되어 온 수신신호의 주파수 대역을 나누고 상기 주파수 대역을 나눈 상기 수신신호에 대하여 각각의 대역에 맞는 위상 회전을 시키는 빔 포머를 포함하는 것을 특징으로 한다.
