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FUS 2.1 The unique needs of ultrasonolography in facial aesthetics


Recall, from our previous lesson unique features of facial ultrasound:
The anatomy of the face is small relative to other parts of the body. We need to be able to have a scanner with a resolution that can differentiate small structures of the face, Such as arteries with a diameter of a millimeter, from other background structures such as fat and muscle.
The anatomy of the faces is relatively superficial compared to the anatomy chest or abdomen. Therefore, we only need an ultrasound device with a penetration depth of four centimetres maximum facial aesthetic practice.

The only ultrasound devices that will have the above properties have a high frequency. Ultrasound devices used for most other applications do not have an adequate frequency for use in medical aesthetics. The purchase of such devices must be avoided as they will not be able to provide useful information to an injector.
The instructors at Learn the Face Education Have personally used dozens of ultrasound devices firsthand, both portable and nonportable. Based on this experience, the minimum recommended frequency for medical aesthetics is 12MHz. Anything below this frequency will be inadequate.
However, 12MHz is still very limiting, you will not be able to visualize all the anatomy of the face, however, you will be able to identify the largest arteries of the face and some key muscles and other patient anatomy.
The ideal frequency for an ultrasound probe for use in medical aesthetics is approximately 20MHz.
This frequency will provide sufficient penetration and resolution to visualize many important structures of the face, including the most critical vasculature.
When ultrasound transducers are above 20MHz, The depth of penetration becomes increasingly limiting factor, recall, that as the frequency increases, resolution increases while the depth of penetration decreases. At ultrahigh frequencies above 20 MHz the penetration is only a centimeter or less, And this becomes quite limiting for visualizing deeper facial anatomy. Scanners about 20 MHz are often used more for academic purposes or within veterinary medicine with small animals were depth of penetration is less of a limiting factor.
At the time this course was published, the highest frequency portable scanner was 20 MHz. Above this frequency, only high-end nonportable devices are available.