You can have Ulthera after fillers. You should wait at least 2 weeks to minimize dissolving the filler that is there. Even after that time, you may see the filler dissolve to a certain extent. I would wait 3 months after the treatment to see how the Ulthera is lifting before...
With Ultherapy the depth of the sound wave penetration makes it possible to target the tissue layers that could previously only be addressed by surgery. The Titan treatment uses infrared light, which cannot be delivered with the same precision.
The regulations dictating who can peform a treatment in a doctor's office, is different in different states. Some may indicate physician supervision and other states may say that aestheticians can not perform certain treatments. There may not be specific mention of ultrasound energy...