| 摘要 |
PURPOSE:To identify the properties of a body to be irradiated accurately by irradiating ultrasonic beams of plural frequencies and identifying the properties of the object to be irradiated by using the reception signals with respect to the respective frequencies. CONSTITUTION:A control unit 8 drives a transducer 1 at a signal of a frequency f1 with respect to a transmission unit 2 to transmit an ultrasonic beam to a specimen SPL. Every time when a reception unit 3 receives the signal of more than a prescribed value, it stores the reflection data showing the intensity of said signal and time data into a memory unit 4. In a pescribed time after the transmission time, the unit 8 oscillates the unit 2 at a frequency f2 and similarly the reception data are stored in the memory unit 4. The ratio of the intensities of the respective reception signals with respect to the respective frequencies is determined, and the information relating to the medium characteristics of a medium OBi on the transmission side than the interface is obtained. Thereby, the properties of the respective media in the specimen are identified accurately, and the foreign matter such as cancer structure is idenfitied. |
