I had focused ultrasound in 2007 for a condition other than PD. It really is amazing in its accuracy, although of course anything that takes place inside an MRI tube is bound to be expensive.

Is focused ultrasound more or less accurate and effective than Cyberknife? I believe that Cyberknife, which uses gold "seed" implants, is a bit more precise than MRI guidance, because it doesn't matter whether the patient moves.