Medical Ultrasound Scanner instrument adopt sonar principle, radar technology and electronic technology and combine with that. It is mainly applied in clinical diagnosis. It launchs out a bunch of high-frequency ultrasound pulses to organisms and receives the reflection echo of interface from organizations of organisms. After amplification, processing and display, we can observe the shape of the internal organs, size, the organs mutual position and the activities of organs and abnormal matter. With science and technology development, more and more new technology are applied in manufacturing of this equipment. Therefore, ultrasound diagnostic instrument development has developed from one-dimensional ultrasound scan and show way to two-dimensional or three-dimensional ultrasound scan and display way. It increases echo information greatly and makes lesions clear. It is applied in diagnostic tests widely in clinical and become one of four medical imaging technology.

 Ultrasound diagnostic instrument types

Ultrasonic is mainly applied in clinical diagnosis besides treatment and surgery. In diagnostics aspects, Medical ultrasound technology can be divided into two categories: Echo scanning technology; Ultrasound diagnosis technology of doppler principle.

The principle of Ultrasound diagnosis technology of echo scanning technology is that use signal to diagnostic disease and it is mainly applied in detection and diagnosis of anatomy and it can know about organ morphology and organization status and change. It can be divided into five types in accordance with show echo way：（1）A type；（2）B type; (3)C type; (4)M type: (5) F type. Besides the single form, there is complex diagnostic instrument, it is that adopt the five ways imaging. At present, Echo scanning technology is widely applied in liver, spleen, stomach, kidney, bravery, thyroid, breast, eye, the uterus, ovaries, chest, lung, meniscus and brain examination.

Ultrasound diagnosis technology of doppler principle use frequency shift phenomenon which movement object reflection sound waves causes. This technology is mainly used in knowing about body organs function condition and physiology and pathology condition of blood dynamics. At present, Ultrasound doppler is mainly applied in cardiovascular disease diagnosis.

In diagnosis aspects, we adopt 1MHz-15MHz frequency on the basic of detecting depth and resolution. Low frequency is mainly used in deep tissue and organs examination and high frequency is applied in shallow inspection. At the same time, for avoiding producing biological effect, ultrasound power is 1mW/cm2~10m W/cm2 in general.

How to improve imaging resolution in diagnosis aspect is exploration target of researching and developing B ultrasound.

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