【正文】 tic medium, will be one kind of energy dissemination form, its diversity will be the ultrasonic frequency is high, the wave length, will have the good beam in certain distance along the straight line dissemination and the directivity, at present the abdomen supersonic image formation will use the frequency range in 2~5MHz, (will vibrate 1 time for 3~ each second is 1Hz,1MHz=106Hz monly used, namely each second will vibrate 1,000,000 times, but Wen Bo frequency between 1620000HZ).Two main parameters about ultrasonic wave:Two main parameters about ultrasonic wave are: Frequency: F≥20KHz。 Power density: p= emissive power (W)/emitting area (cm2)。 Usually p≥。 The supersonic wave energy which disseminates in the liquid carries on the clean to the object surface39。s contamination, its principle available “the cavitation” the phenomenon explained: The ultrasonic wave vibration disseminates when the liquid the sound wave intensity of pressure which achieves an atmospheric pressure, its power density is , by now the ultrasonic wave sound wave intensity of pressure peak value might achieve the vacuum or the negative pressure, but in fact does not have the negative pressure existence, therefore has a very tremendous pressure in the liquid, bees the empty cavitation nucleus the liquid member tension fracture. This cavity very close vacuum, it when the ultrasonic wave intensity of pressure achieves reverse is biggest bursts, as a result of bursts the intense impact which produces to hit the object surface contamination. This kind the shockwave phenomenon which produces by the innumerable tiny cavitation air bubble collapse is called “the cavitation” the phenomenon.The function of ultrasonic wave:The glass ponents, the glass and ceramic article39。s removing dirty stuff is terrible business, if puts in these goods in the cleaning liquid, passes over the ultrasonic wave again, on the cleaning liquid fierce vibration impact goods dirt, can clean cleanly very quickly.Although said that the humanity does not listen to the favorable balance of trade sound wave, but many animals actually have this ability. They may using the ultrasonic wave “the guidance”, capture food, or avoids the danger. Everybody possibly saw summer39。s night has had many bats back and forth to soar in the garden, why haven39。t they in the luminous situation soared, but will not lose the direction? The reason is the bat can send out 2 ~ 100,000 hertz ultrasonic waves, this is just like is a activity “the radar station”. The bat is precisely uses this kind “the radar” front the judgment flight is an insect, perhaps obstacle. But radar39。s quality has several dozens, several hundred, several thousand kilograms, but in some important performance precision. Antijamming ability and so on, bat far superior and modern wireless beacon. On the deep research animal body each kind of organ39。s function and the structure, will obtain the knowledge uses for to improve the existing equipment, this is a new discipline which for the past many years develops, the named bionics.Our humanity only then the academic society uses the ultrasonic wave until the First World War, this is uses “the sound navigation and ranging” the principle searches in the sounding the goal and the condition, like submarine39。s position and so on. This time the people send out a series of different frequencies to the water in the ultrasonic wave, then the record and the processing reflection echo, we then may estimate the survey from the echo characteristic the distance, the shape and the dynamic change. In the medicine using the ultrasonic wave was most early in 1942, Austrian Dr. Du Sieck uses the supersonic technology to scan the brain structure for the first time。 Started later to the 60s doctors the ultrasonic wave to apply in the abdomen organ39。s survey. Now the ultrasonic wave scanning technique has bee the modern medicine to diagnose the essential tool.The medicine ultrasonic wave inspection39。s principle of work and the sound navigation and ranging have certain similarity, soon the ultrasonic wave launches in the human body, when it meets the contact surface when in vivo will occur reflects and refracts, and is possibly absorbed in the Body tissue weakens. Because the human body each kind of organization39。s shape and the structure are not same, therefore its reflection and the refraction as well as the absorption ultrasonic wave39。s degree is also different, doctors are precisely reflected through the instrument the wave mode, the curve, or the phantom characteristic distinguishes them. In addition rebination anatomy knowledge, normal and pathology change, then may diagnose the organ which inspects whether to be sick.At present, doctors apply the ultrasound diagnosis method has the different form, may divide into A, B, M and the D four broad headings.A: By the profile demonstrated that the organization characteristic the method, mainly uses in surveying organ39。s diameteral wire, determines its size. May use for some physical property which distinguishes the pathological change to organize, like substantive, liquid perhaps gas whether to have and so on..B: With plane figure39。s form demonstrated that is investigated organization39。s special details. When inspection, first transforms the human body contact surface39。s reflection signal into the strong and the weak different luminous spot, these luminous spots may e out through the fluorescent screen appearance, this method intuitive is good, duplicated, may contrast for around, therefore widely uses in system disease39。s and so on gynecology and obstetrics department, uropoiesis, digestion and cardiovascular diagnoses.M: Used in observing the active contact surface time variation one method. Most is suitable in inspecting heart39。s active situation, its curve39。s dynamic change is called the echocardiogram, may use for to observe heart each structure the position, the active state, the structure condition and