I think the scan you may be thinking of is the REMS Echolight. It is said to be more accurate and reliable, not prone to error like the DEXA, so you don't have to stay with the same equipment for all your scans. Most importantly for me, it provides a fragility score and measures bone quality which the DEXA does not. Bone quality is a vital part of fracture risk and can be better or worse than BMD. REMS is gaining recognition in N.A. and received FDA approval. I just had one last week in Calgary, Alberta, Canada for ($150.00 CA.) which was well worth it. It isn't covered by insurance yet. Dr. Doug Lucas has a good video on the REMS and there are NIH studies.