Doppler ultrasound: what is it and when assigned?
Ultrasonic methods of diagnosis are applicable not only to bodies but to vessels. To study their condition and applied research, which is based on the Doppler effect. Its essence consists in the following: ultrasound goes on circulating in arteries and veins red blood cells and is reflected from them. Thanks to the converted ultrasonic device signal, it is possible to learn the following parameters:
- the structure of the vessel;
- the blood flow rate therein;
- the condition of the walls;
- the presence of deformations, including aneurysms;
- the presence of thrombus or atherosclerotic plaque;
- the size of the lumen of the vessel;
- the nature of blood flow.
It is important to know not only about what is Doppler ultrasound (Doppler ultrasound), but for some reasons she held.
Diagnostic ultrasound, Doppler effect is applied to the vessels of the head and neck to such statements:
- pain in the head;
- noise in the ears;
- disorders of the emotional sphere;
- frequent episodes of loss of consciousness;
- impaired coordination, vision and hearing;
- traumatic brain injury;
- epileptic seizures;
- hereditary factor in the development of cardiovascular diseases;
- osteochondrosis of the neck.
Ultrasonic dopplerography of the main arteries of the head will determine the factors that cause disturbance of the blood supply to the brain.
If a person has symptoms such as cramps in the calf muscles, swelling of the lower limbs, visualization of the vascular pattern on the legs and skin pigmentation, Doppler of blood vessels is also required. People with hypertension, atherosclerosis and thrombosis, this study should be carried out regularly. During the diagnostic procedure, attention is paid to the parameters:
- the inferior Vena cava;
- iliac veins;
- femoral vein;
- the great and small saphenous veins;
- the popliteal vein;
- deep veins of the lower leg.
Special attention is paid to the patency of deep veins and their valves. Dopplerography of blood vessels helps to identify the compression of blood vessels and scarring spazmirovannah muscles of the lower extremities. This diagnostic method allows to determine the degree of thrombosis of leg veins.
In the diagnosis of diseases of kidneys, special attention is paid to the status and functioning of the renal arteries. Ultrasonic dopplerography of the renal arteries allows to reveal the stenosis, and at the initial stage of its development. The study is being conducted patients who had undergone surgery for a kidney transplant, because due to dopplerography, it is possible to detect the rejection of donor organ. Also with the help of this diagnostic method to monitor the renal cavities.
Dopplerography of blood vessels, particularly the renal arteries, used in the diagnosis of andrological and urological diseases in men, including in disorders of erection. Indications for the study include:
Using this procedure to identify the presence of additional renal arteries.
Doppler also plays a significant role in perinatal diagnosis. This method allows to estimate the circulation of the fetus. Due to dopplerography, it is possible to identify abnormalities in placental and uterine blood flow, and abnormalities in heart function and blood supply of the brain. Indications for imaging of the fetus:
- preeclampsia, diabetes, heart diseases, hypertension in the mother;
- premature aging of the placenta, intrauterine growth retardation of the fetus.
Study prescribed to women whose previous pregnancy was accompanied by preeclampsia and other serious complications, including intrauterine fetal death.
The features of the
Ultrasound of vessels of head and neck does not require special training. The procedure itself takes about 30 minutes. During the study, the doctor moves the ultrasound sensor of the apparatus in the studied areas of the head and neck of the patient, pre-lubricated with gel. The sensor sends to the apparatus the signals are converted to image vasculature of the head. All the results of the study vessels are served at the conclusion.
Doppler of the legs is performed in the supine position, with the limbs of the patient should be bent at the knees. The gel is applied on both. Also the study needs to assess the condition of veins and arteries of the legs in the standing position. With regard to the frequency of radiation of the ultrasound, it depends on the depth of location of the investigated vessel. Deep leg veins are investigated using low frequency sensors.
Ultrasonic dopplerography of the renal arteries is performed using a low frequency sensor as the examined vessels are deep. The study is performed on an empty stomach. The patient should lie on the right or left side. To get an accurate depiction of the renal vessels, you should place the sensor at the mid-point between the xiphoid process and the umbilicus. Subject to the rules of carrying out of ultrasonic diagnostics of the kidneys, you can get the image 90% of their vessels.
Dopplerography of renal vessels may be uninformative if the patient’s intestines have accumulated gases. In this case, you will need a casual scan. Usually, the procedure of examination of kidneys within 30 minutes.
A breakdown of the results of Doppler ultrasound and the appointment of treatment does the doctor who examines the patient.