What can I do to ensure that all filler is dissolved completely?

I have had injection of Teosyal Rh3 in my nasolabial folds and smile lines.As i had a hypersensitivity typ 4 reaction to the filler, i am dissolving it ultrasound targeted. Unfortunately the ultrasound shows integrated filler rather than bubbles of filler. How can i be sure, all fillers are dissolved completely? I cannot find any scientific publication on that. I was recommended to do MRI again, but as far as i know, MRI resolution is limited? It would be Tesla3 MRI. Thank you