I don't know, but it seems damn strange to me that any professional would consider an improved diagnostic tool to be a liability.
Seems like a 3300 dollar liability to the good doctor complaining........all about the all might buck ya know.
Imagine when a home version is available.
(much like blood pressure machines are now)
They are concerned about the missed cases and law suit.
Angiograms are the gold standard. I can see a lawyer tearing one of these guys up " Why did you use the cheap test rather than the one that has been proved for the past 15 years".
Women and minorities hardest hit.