Capacitive ultrasonic transducer and endo cavity ultrasonic diagnosis system using the same

A noise elimination apparatus for eliminating a noise component from sensed information sensed by a capacitive ultrasonic transducer (c-MUT) used for an endo cavity ultrasonic endoscopic diagnosis system comprising an ultrasonic endoscopic scope equipped with the c-MUT for transmitting and receiving an ultrasound, comprising:

• a first storage unit for storing the first sensed information sensed by making the c-MUT transmit an ultrasound under a condition of the ultrasound not reflecting;
• a third storage unit for storing the third sensed information sensed by the c-MUT transmitting and receiving an ultrasound under a condition thereof touching an inside wall of an endo cavity;
• and
• an arithmetic operation unit for calculating a correlation or difference between the third sensed information and first sensed information.

A noise elimination method for eliminating a noise component from sensed information sensed by a capacitive ultrasonic transducer (c-MUT) used for an endo cavity ultrasonic endoscopic diagnosis system comprising an ultrasonic endoscopic scope equipped with the c-MUT for transmitting and receiving an ultrasound, comprising:

• obtaining the first sensed information sensed by making the c-MUT transmit an ultrasound under a condition of the ultrasound not reflecting;
• obtaining the second sensed information sensed by the c-MUT transmitting and receiving an ultrasound under a condition thereof in a state of being in the inside of an endo cavity and yet not touching an inside wall thereof;
• and
• calculating a correlation or difference between the second sensed information and first sensed information.

A noise elimination method for eliminating a noise component from sensed information sensed by a capacitive ultrasonic transducer (c-MUT) used for an endo cavity ultrasonic endoscopic diagnosis system comprising an ultrasonic endoscopic scope equipped with the c-MUT for transmitting and receiving an ultrasound, comprising:

• obtaining the first sensed information sensed by making the c-MUT transmit an ultrasound under a condition of the ultrasound not reflecting;
• obtaining the third sensed information sensed by the c-MUT transmitting and receiving an ultrasound under a condition thereof touching an inside wall of an endo cavity;
• and
• calculating a correlation or difference between the third sensed information and first sensed information.