Introduction to Doppler color ultrasound machine

Color ultrasound diagnostic instrument is referred to as color ultrasound for short. It refers to high-definition black-and-white B-ultrasound plus color Doppler. Color Doppler ultrasound generally uses autocorrelation technology to process Doppler signals. The blood flow signals obtained by autocorrelation technology are color coded and then superimposed on the two-dimensional image in real time to form a color Doppler ultrasound blood flow image.

Ultrasonic examination is an imaging examination method that uses human body to observe the reflection of ultrasound. Ultrasound is a kind of high-frequency sound wave, which can cause changes in the function, structure or state of biological system when it propagates in biological system, that is, ultrasonic biological effect. The degree of biological effects caused mainly depends on the size of ultrasound dose and the length of examination time.

Doppler color ultrasound machine

Clinical application of color doppler ultrasound

1. Vascular disease

Using a 10MHz high-frequency probe, calcification points less than 1mm in the blood vessel can be found, which has good diagnostic value for carotid arteriosclerotic occlusive disease. It can also use the local amplification of blood flow detection to determine the extent of lumen stenosis, whether the embolus is likely to fall off, whether there is an ulcer, and prevent the occurrence of cerebral embolism.

For carotid body tumor, abdominal main aneurysm, vascular occlusive vasculitis, chronic lower extremity venous disease (including lower extremity varices, original lower extremity deep venous valve insufficiency, lower extremity deep venous reflux obstruction, thrombophlebitis and venous thrombosis), the high definition, local amplification and blood flow spectrum exploration of color Doppler ultrasound can make a more accurate diagnosis.

2. Abdominal viscera

Abdominal color Doppler ultrasound is mainly used for liver and kidney, but it has certain auxiliary diagnostic value for the differential diagnosis of benign and malignant lesions in the abdominal cavity, gallbladder cancer and large polyps, chronic severe inflammation, common bile duct, hepatic artery and other diseases.

For liver cirrhosis, color Doppler ultrasound can make a better judgment from the size of various intrahepatic vascular lumens, the speed and direction of internal flow, and the establishment of collateral circulation. For nodular sclerosis and diffuse liver cancer, which are difficult to distinguish between black and white, it is helpful to make differential diagnosis by high-frequency exploration and blood flow spectrum exploration.

3. Small organ

Breast color ultrasound is mainly used for the differential diagnosis of breast fibroma and breast cancer, while eyeball is mainly valuable for the diagnosis of ocular vascular diseases.

4. Gynecology

The main advantages of color Doppler ultrasound in gynecology and obstetrics are the differentiation of benign and malignant tumors and the evaluation of umbilical cord disease, fetal congenital heart disease and placental function. It has better auxiliary diagnostic value for trophoblastic diseases. It can also make the diagnosis of infertility and pelvic varices under black and white ultrasound by observing the blood flow spectrum.

The use of vaginal probe has certain advantages over abdominal exploration, and its advantages are mainly reflected in:

① It has high sensitivity and display rate to uterine artery and ovarian blood flow.

② Shorten the examination time and obtain accurate Doppler spectrum.

③ There is no need to fill the bladder.

④ It is not affected by body fat, abdominal scar, intestinal cavity inflation, etc.

⑤ Use the activity at the top of the probe to find the painful part of the pelvic viscera to determine whether there is pelvic adhesion.

The difference between B-mode ultrasound and color ultrasound

The doctor did "B ultrasound" first, and then "color ultrasound". Doctors first use the "B ultrasound" function to observe the structure of organs and lesions, and then carry out the "color ultrasound" examination. Especially when the lesions are found, the "color ultrasound" can observe the distribution of blood vessels inside and around the lesions, and can analyze the blood flow parameters such as the speed of blood flow, which is of great significance to the qualitative analysis of the lesions.

Popular science of color ultrasound machine inspection

In each ultrasonic examination, the doctor will smear a liquid on the ultrasonic probe, and there will be a cool and itchy feeling when contacting the patient's skin, which is called ultrasonic coupling agent.

Ultrasonic couplant is a medical product composed of a new generation of water-borne polymer gel. Its PH value is neutral, non-toxic and harmless to human body, not easy to dry, not easy to rancidity, clear ultrasound imaging, suitable viscosity, no greasy, the probe is easy to slide, can wet the skin, eliminate the air on the skin surface, good lubrication performance, easy to expand; No corrosion and damage to the ultrasonic probe; Ultrasonic coupling agents with sterilization and disinfection functions have appeared on the market. Compared with traditional ordinary coupling agents, they are more strict for the production environment and have a wider scope of application.

The use of Doppler color Doppler ultrasound is painless, non-injured and non-radioactive for the examinees, and the results are direct, rapid and repeatable, which is very popular with doctors and patients. It has become an indispensable diagnostic method in modern clinical medicine because of its high detection rate and non-invasive diagnosis rate of various diseases.