Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for collagen...
https://city-wiki.win/index.php/Can_I_Do_Ultherapy_and_RF_Together_or_Is_That_Too_Much_Heat%3F
Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for collagen lift, with results peaking around 3 to 6 months