Unlike HIFU treatments, it can accurately distinguish between the different depths of skin that need to be targeted for lifting, such as 3.0 mm beneath the surface of the skin, just above the superficial muscular aponeurotic system
(SMAS) that holds the various layers together, and even as deep as 4.5 mm beneath the surface and onto the skin's foundational layer.
There is a similar continuity along the superficial fascia of the chest and the platysma, which is connected with the superficial muscular aponeurotic system
(SMAS) comprising the mimical muscles of the face [69, 72, 73].
To further minimize tension, it is often useful to place suspension sutures from the underlying superficial muscular aponeurotic system
layer to the mastoid periosteum.
The fibrous attachment of the superficial muscular aponeurotic system
(SMAS) in the melolabial crease, relaxed skin tension lines located in the lower eyelid, and the boundary line at the inferior orbital rim provide important landmarks for concealing incision .