How long until a daily brain scan and body scan is a part of everyone's routine, the same way brushing your teeth is? Problems like these are untreatable if left for too long, but if caught early, there's sometimes hope. The solution seems to be to develop as many types of passive scanners as possible. The problem is false positives. But wasting a month needlessly visiting the doctor doesn't seem that bad.
False positives aren't inherently a problem. If you have accurate understanding of the sensitivity and specificity of a test, then you can take action to maximise the utility of the expected outcome. This means, for example, not necessarily performing a biopsy just because something is there (but it's probably benign). The cost of invasive procedures such as biopsies, and risk-increasing tests such as CT scans has to…
That's not really true. The cost of the machine is amortised by having it be in use at all times. In my experience MRI's are already fully utilized. I've had 3 in the past year. Even during Diwali there was always someone immediately before and immediately after me, and I never have much choice about appointment times.