knowledge in ultrasound medicine
Whether it is a health checkup or going to a hospital for treatment, this familiar and unfamiliar ultrasound examination (commonly known as B-ultrasound) is always inevitable. It is believed that many people's understanding of ultrasound examination is still only in the examination of gallstones and other diseases or the examination of pregnant women and fetuses. In fact, these are only a small part of its clinical application. Today, let us share with you the "those things about ultrasound examination".
01
Why is the image displayed by "color Doppler ultrasound" black and white?
"Color Doppler Ultrasound" is the abbreviation of color Doppler ultrasound diagnosis instrument, which is a combination of high-definition black and white B-ultrasound + color Doppler. It not only has the advantages of two-dimensional ultrasound structure images, but also provides rich information on hemodynamics. Can improve the diagnosis rate of the disease.
02
What is the liquid applied during the ultrasound examination? Is it harmful to the human body?
During the ultrasound examination, the liquid that the doctor smears on the examination site is called a medical couplant. The purpose of using a medical couplant is to fill the probe and the skin so that there is good contact, which is conducive to the transmission of sound waves and improves the imaging quality. It is a water-soluble colloid, non-toxic, odorless, non-irritating, easy to wipe, safe and harmless!
03
I am a pregnant mother, is ultrasound examination harmful to the human body? Can I do it as many times?
Regular B-ultrasound equipment has strict control over the ultrasound output power. The ultrasound output energy is very small and will not produce any obvious adverse reactions. There has also been no report of fetal malformations caused by ultrasound examination. But as far as safety is concerned, no matter what the inspection is, the inspection time and the number of inspections must be controlled!
04
Why do some ultrasound examinations require an empty stomach, while others require holding back urine?
The principle of ultrasound examination is to transmit ultrasound into the human body and form an information imaging inspection method through the reflection of the tissue interface. During abdominal ultrasound examination, the gastrointestinal contents and intestinal gas will interfere with the image, especially the bile emptying of the gallbladder after eating. Zoom out, causing the image to be unclear. Therefore, please remember the following points:
upper abdomen
Mainly the digestive system (liver, gallbladder, pancreas), abdominal vascular, retroperitoneal lymph nodes and other examinations require 8-12 hours on an empty stomach.
Lower abdomen
Urinary system (kidney, ureter, bladder, prostate), gynecology (uterine appendage) and other examinations need to hold back urine to fill the bladder.
05
I heard that you don’t need to hold your urine in the yin ultrasound examination? Can you do this check directly for me?
Transvaginal ultrasonography (also called intracavitary ultrasound) is to insert a vaginal ultrasound probe into the vagina for inspection. When the urine is empty, the result will be clearer. But not everyone is suitable for this examination. Those without a history of sexual life, heavy vaginal bleeding, or severe vaginitis are not suitable, and transabdominal ultrasound examination is required.
06
What are the advantages of transvaginal color Doppler ultrasound and transabdominal color Doppler ultrasound?
Transvaginal ultrasonography uses a high-frequency probe that extends into the vagina and is closer to the uterus and ovaries. The image is clear, the resolution is high, and the results are more accurate. It is especially suitable for the examination of endometrial lesions and the monitoring of follicular development. There is no need to hold back the urine; the trans-abdominal ultrasonography scans a wider range, less restricts the physical condition of the examinee, and under the condition that the urine fills the bladder properly, the display of larger lumps is clearer. When dealing with difficult cases, we often combine the two to achieve better diagnostic results.
