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Harmonic imaging

Harmonic imaging exploits the non-linear propagation of ultrasound through the body tissues. When the frequency of an emitted sound wave is f 0, the frequency of echo (due to reflection or scattering) includes f 0 (called fundamental wave), 2f 0, 3F 0 and so on The second harmonic (2f 0) has the largest energy.

Ultrasonic harmonic imaging (UHI) is based on the information of the human body carried by the second harmonic in echo (reflection or scattering). Harmonic imaging without UCA is called native harmonic imaging or tissue harmonic imaging. Harmonic imaging using UCA (ultrasound contrast agent) is called contrast harmonic imaging.

What is ultrasound?

Ultrasound, that is, ultrasonic wave, is a kind of mechanical wave. The sound wave frequency that our human ears can hear is 20~20000Hz. When the frequency of the sound wave is greater than 20000Hz or less than 20HZ, we cannot hear it. Therefore, we put the frequency higher than Sound waves at 2000HZ are called "ultrasound". Ultrasonic waves have good directionality and strong penetrating ability. They are easy to obtain concentrated sound energy and can propagate far in water. They can be used for distance measurement, speed measurement, cleaning, welding, gravel, sterilization and disinfection, etc.

The frequency of ultrasound usually used for medical diagnosis is 2~10MHz. The advantages of ultrasonic diagnosis are that it is painless and non-injurious to the subjects, is convenient for examination, has intuitive images, is dynamic and real-time, and has clear images, so it is very popular among clinicians and patients.