> Of course, there is no risk with a full-body MRI scan.
Not quite true. While the scan itself isn't harmful, the strong magnetic fields, RF fields and noise have caused several accidents, some fatal. Compare for example http://www.auntminnie.com/index.aspx?sec=sup_n&sub=mri&pag=d... "The FDA's Manufacturer and User Facility Device Experience (MAUDE) database documented a total of 40 incidents for MRI in 2004. In 2009, the total more than quadrupled, to 193 reported adverse events."
> 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.
False positives can still cause huge psychological strain on the involved person(s).
Not quite true. While the scan itself isn't harmful, the strong magnetic fields, RF fields and noise have caused several accidents, some fatal. Compare for example http://www.auntminnie.com/index.aspx?sec=sup_n&sub=mri&pag=d... "The FDA's Manufacturer and User Facility Device Experience (MAUDE) database documented a total of 40 incidents for MRI in 2004. In 2009, the total more than quadrupled, to 193 reported adverse events."
Example of a fatality: http://abcnews.go.com/US/story?id=92745
> 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.
False positives can still cause huge psychological strain on the involved person(s).