Hundreds of people, multiple hospitals.
"To do that, GE offers a feature on its CT scanner that can automatically adjust the dose according to a patient?s size and body part. It is, a GE manual says, ?a technical innovation that significantly reduces radiation dose.?
At Cedars-Sinai and Glendale Adventist, technicians used the automatic feature ? rather than a fixed, predetermined radiation level ? for their brain perfusion scans.
But a surprise awaited them: when used with certain machine settings that govern image clarity, the automatic feature did not reduce the dose ? it raised it. "
http://www.nytimes.com/2010/08/01/he...pagewanted=all