I'm not sure exactly where you're located (only been through Miami once) but when I typed in MRI Guided Biopsy & Miami Dade I found a place called Baptist Health in South FL / South Miami Hopsital that offers a wide variety of cancer services. Hopefully they are within your area and you can go there.
Other than that I couldn't fund much actual info, so hopefully they offer the procedure you need.
Good lukc to you!
Angi