But officials said the contrast agent given to them before their scans to enhance image definition was being treated as a possible cause.

BBC: Brazil health authorities investigate MRI scan deaths

However, they had all been injected with a contrast agent to improve the visibility of their internal organs in the 3D images MRI scanners produce.

BBC: Brazil health authorities investigate MRI scan deaths

Schering, a German pharmaceuticals company, is hoping to get approval for a contrast agent whose bubbles, under a correctly tuned ultrasonic beam, will oscillate and eventually rupture.

ECONOMIST: The ne plus ultra of medicine

If the contrast agent was found to be responsible for the deaths, patients at other hospitals might be at risk because it was provided by a third party, the officials warned.

BBC: Brazil health authorities investigate MRI scan deaths

Scott, by contrast, entered the NFL in 2002 as an undrafted free agent linebacker out of unheralded Southern Illinois University.

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