[louden]

You are comparing a program where the benefits vastly outweigh the cost to a program where the benefit is mostly speculative and the cost known.

The cost of full body imaging is not just in the scan itself but in the procedures that follow it that require anasthesia (non-zero chance of killing the patient), cause pain and may cause secondary infection. In fact, just being in the hospital or doctors office to get the procedure has a non-zero risk to due to the concentration of sick people there.

[Brakenshire]

I agree in the sense that this appears to be the reality of the situation at the moment, that the benefit is speculative because of a lack of evidence for the effectiveness of either the data or our ability to interpret it. I highly doubt that will be the case in the long run, as costs come down, resolution goes up, and analysis software improves.