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Focused thermal ultrasound techniques work by raising the tissue temperature up to 48 °C, [13] resulting in coagulative necrosis of adipocytes, with sparing of vessels and nerves. Passive heating of the skin may also induce collagen remodeling. [14] [15] [16] Hydrolipoclasy is a technique that is being studied as an alternative to liposuction ...
By manipulating skin cooling during treatment, RF can also be used for heating and reduction of fat. Currently, the most common uses of RF-based devices are to noninvasively manage and treat skin tightening of lax skin (including sagging jowls, abdomen, thighs, and arms), as well as wrinkle reduction, cellulite improvement, and body contouring. [7]
This is known as Magnetic Resonance guided Focused Ultrasound (MRgFUS) or High Intensity Focused Ultrasound (HIFU). These procedures generally use lower frequencies than medical diagnostic ultrasound (from 0.7 to 2 MHz), but higher the frequency means lower the focusing energy. HIFU treatment is often guided by MRI.
The ultrasound within tissue consists of very high frequency sound waves, between 800,000 Hz and 20,000,000 Hz, which cannot be heard by humans. Some of the advantages of ultrasound as a diagnostic and therapeutic tool include its safety profile, lack of radiation, portability, and low cost. [4]
Swelling, in some cases, may persist for weeks or months after liposuction. Skin necrosis occurs when the skin above the liposuction site changes color and falls off. Large areas of skin necrosis may become infected with bacteria or microorganisms. Burns can occur during ultrasound-assisted liposuction if the ultrasound probe becomes hot.
Magnetic resonance imaging (MRI) uses radio frequency waves to generate images of the human body. [3] Radio frequencies at non-ablation energy levels are commonly used as a part of aesthetic treatments that can tighten skin, reduce fat by lipolysis and also apoptosis, [4] or promote healing. [5]