To provide an ultrasonograph which removes noise mixed in an analog signal using a noise signal to be actually mixed in a circuit.
The ultrasonograph includes: a plurality of receiving circuits 102 which receive echo signals from a vibrator 002; a receiving circuit 102 which is connected to the vibrator 002 to output the noise signal to be mixed at a state that the echo signals are not received; a subtractor 103 which subtracts output of the receiving circuit 102 from the receiving circuit 102 when the receiving circuits 102 receive the echo signals; an amplification unit 104 which amplifies a signal from which the noise signal is subtracted; an A/D converter 105 which changes the amplified signal into a digital signal; a signal processing unit 003 which performs signal processing to the signal converted into the digital signal; an image processing unit 004 which performs image processing to the signal to which the signal processing is performed to generate image data; and a display control unit 005 which displays ultrasonic images on the display unit 007 based on the image data.
OKUMURA TAKATOSHI
HONGO HIRONOBU
NAKADA KAZUTO
UNAYAMA KENICHI
FUKAZAWA TAKESHI
MOCHIZUKI FUMIO
TOSHIBA MEDICAL SYS CORP
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