Medical ultrasound scanners are a common diagnostic tool used to generate images of internal tissues in the human body. In the field of medicine, it has become an important non-invasive examination method that can help doctors make accurate diagnoses. This article will introduce the basic principles of medical ultrasound scanners and their importance in clinical applications.

1、 Generation of ultrasound

Medical ultrasound scanners generate images through sound waves. Ultrasound is a high-frequency sound wave generated by piezoelectric crystals in the frequency range of 40kHz to 10MHz. Piezoelectric crystal is a kind of material with Piezoelectricity. When voltage is applied, it will produce mechanical vibration, thus producing sound waves.

2、 Propagation and Reflection of Ultrasound

The propagation speed of ultrasound through internal tissues of the human body is related to tissue density. When ultrasound encounters tissue interfaces with different densities, some of the sound waves will be reflected, while the other part will further propagate. By measuring the propagation time and reflection signal of ultrasound, ultrasound scanners can determine the position and structure of tissues.

3、 Generation of ultrasonic images

Medical ultrasound scanners generate images through the following steps:

1. Emission of sound waves: Piezoelectric crystals inside the scanner generate ultrasonic waves and emit them into the human body. Usually, sound waves are emitted in the form of pulses, which are high-energy sound waves that are emitted intermittently over a period of time.

2. Receiving reflected waves: When ultrasound encounters an interface, a portion of the sound waves will be reflected back. The receiver inside the ultrasonic scanner will receive these reflected waves and convert them into electrical signals.

3. Signal processing: The receiver amplifies the received electrical signal and performs filtering and decoding processing. These processing steps help reduce noise and extract effective signals.

4. Image reconstruction: By calculating the propagation time of sound waves and the intensity of reflected signals, ultrasonic scanners can determine the position and shape of tissues. This information is used to generate 2D or 3D images that display the structure of the internal tissues of the human body.

4、 Clinical application

Medical ultrasound scanners have a wide range of applications in clinical practice:

1. Gynecological examination: Doctors can use ultrasound scanners to observe women's uterus and ovaries to detect lesions and pregnancy.

2. Liver examination: Ultrasound scanners can be used to evaluate the size, structure, and blood flow of the liver, which helps diagnose liver diseases.

3. Cardiac examination: Doctors can use ultrasound scanners to observe the movement and blood flow of the heart to help diagnose heart disease and evaluate heart function.

4. Prenatal examination: Ultrasound scanner is a common examination tool for pregnant women, used to observe the growth and development of the fetus.

conclusion

Medical ultrasound scanner is an important diagnostic tool based on the principle of ultrasound, which generates images of internal tissues of the human body through the propagation and reflection of sound waves. It is widely used in the medical field and plays an important role in early detection and accurate diagnosis of diseases. The development of medical ultrasound scanners enables doctors to obtain detailed internal structural information without trauma, providing patients with more accurate diagnosis and treatment services.