At present, there are many colour ultrasonic system brands and how to choose them from price, performance and use. Now let me introduce it from parameters.

First, Clinical application scope and emphasis: Ultrasound is applied in abdominal, heart, the shallow organ, peripheral vascular, lumen and imaging. At present, it can be divided into the whole body machine, heart machine, blood vessels machine of shallow organ. We must seek brand and model in accordance with demand. For example, VIVID of GE is good at heart diagnosis; Madison machine is good at gnecology and obstetrics of abdominal and heart diagnosis is weakly; Japan machine is good at image quality in abdominal, but because of technology reason, heart image is bad.

Second, detector. There are convex array, linear array, phased array, cavity, volume and heart chamber catheter probe. It has technology of broadband, multi-frequency and frequency conversion. Whether it provides the function of harmonic imaging or not.

Third, two dimension gray-scale imaging system

(1)Digital beamforming technology

(2)Emission or receiving channel number

(3) Dynamic range of receiving ultrasonic signals

(4) Scan line density

(5) Detecting depth

(6) Frame rate

(7)Whether support the organization and imaging harmonic or not.

(8) Composite imaging technology

(9) Tissue doppler

(10) control imaging technology of pulse wave

(11) Gray-scale blood flow imaging technology

(12) Linear array detector trapezoidal imaging technology

(13) Wide view imaging technology

Fourth, Doppler imaging system

(1)     Doppler types:PW, CW, HPRF

(2)     Show ways

(3) Measurement speed: Most/Least

Fifth, Color blood flow imaging system

(1) Blood flow imaging ways

(2)Color blood flow show ways: speed image, energy figure

(3) Color show angle

(4)Color display Frame frequency

Sixth, three-dimensional imaging function

(1)4D stereoscopic imaging technology

(2) Three-dimensional imaging: Organization, blood vessels, surface

Seventh, Organization optimization and processing technology

(1) Pixel optimization, spots and noise removing technology

(2) Scanning control technology

(3) Automatic organization show optimization technique

Eighth, Measurement analysis function

(1)   General measurement function

(2) Doppler flow measurement and analysis

(3) Heart function measurement and analysis

Ninth, Digital data and image storage, management, transmission system

(1)   Document information management system: Report document storage, image storage format choice, Storage media: HD, FD, MOD, CD, DVD.

(2)Digital transmission system: Video printer interface; External monitor machine interface; Video interface; DIMCOM3.0 interface; USB interface.

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