The method for obtaining information of the normal and abnormal state of biological tissue by the use of ultrasonics in the mega hertz range is called as ultrasonic diagnostics in medicine.
In the ultrasonic diagnosis currently used for clinical examination in routine, the ultrasonic beam radiating from an ultrasonic transceiver, called a probe, travels through the biological tissue which form the sound medium for the beam. Diagnostic information is obtained from the reflection and attenuation of the ultrasound peculiar to the tissue under examination. A special merit of this method is that it is possible to detect the characteristic beam of soft tissue in the form of acoustic tissue structure.
In the present report; firstly, the application of ultrasonic diagnostics for clinical examination in various branches of medicine is reported. Secondly, a survey of ultrasonic technique used in ultrasonic diagnostics is given. In particular, the status of the ultrasonic pulse reflection method and the ultrasonic Doppler method which are mainly used at present are described. Lastly, as, future aspects, the development of a new field which might be termed ultrasonic biology, the improvement of the ultrasonic transceiver as being a particularly important equipment for ultrasonic diagnostics, the development of the scanning system for ultrasonic beams, and the information processing of the biological information obtained by the present method, are dealt -with as important problems to be solved in the future.
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