FDA aims to rein in radiation-based medical scans

A man fishes on the Moscow River with city skyscrapers under construction in the background, in downtown Moscow, Wednesday, March 17, 2010. Temperature is still below zero, about -10 C (14 F).

William Eckrich waits for candy and beads during the annual St. Patrick's Day parade in Indianapolis, Wednesday, March 17, 2010.

Representatives of Toyota and the National Highway Traffic Safety Administration examine a crashed Toyota Prius, Wednesday, March 17, 2010, in Harrison, N.Y. Toyota recalled more than 8 million cars because their gas pedals could become stuck or be snagged by floor mats. In addition, the government is looking into complaints from at least 60 Toyota drivers who say they got their cars fixed and still had problems.

A woman walks down steps which feature a painted promotional design for the upcoming Earth Hour event at a bank in Hong Kong Tuesday, March 16, 2010. Earth Hour 2010 takes place on Saturday, March 27, at 8.30 pm local time and is a global call to turn off lights for 60 minutes in a bid to highlight the global climate change.

An Experimental Lancair IV-P airplane lies beached on Hilton Head Island, S.C., Tuesday, March 16, 2010, the day after its pilot made an emergency landing. The pilot, Edward Smith, and his passenger survived the crash, but a man jogging on the beach was killed when he was struck by the plane.

The hand of a restorer is seen cleaning a horse's head which is part of a statue which represents Roman Emperor Augustus on a horse, in Wiesbaden, central Germany, Tuesday, March 16, 2010. The head of the approximately 2,000 year old statue was found during excavations in the Roman town of nearby Waldgirmes and will be restored during the next two years before it will be presented in an exhibition.

People view a burning car following an explosion in Warri, Nigeria, Monday March 15, 2010. Twin car bombs exploded outside a government building where amnesty talks were underway Monday in Nigeria's restive and oil-rich region, wounding two people and causing panic, a government spokesman said. Monday's bombing is the most daring attack claimed by the Movement for the Emancipation of the Niger Delta since the group abandoned an unconditional cease-fire agreement with the government. It also may signal the end of amnesty negotiations that have fallen apart during the long illness of Nigerian president Umaru Yar'Adua, who brokered the deals before his health worsened.

A tree lies across a smashed car at a home in Wantagh, N.Y., Sunday, March 14, 2010. Strong winds and heavy rain downed trees and power lines throughout New Jersey, Pennsylvania, New York and Connecticut on Saturday, leaving hundreds of thousands of people without power.

A bear cools off from the summer heat with a frozen watermelon in Rio de Janeiro's city zoo, Friday, March 12, 2010.

Ohio State's Evan Turner (21) celebrates his last second, game-winning three-pointer with Jon Diebler, left, and David Lighty in the second half of an NCAA college basketball game in the quarterfinals of the Big Ten conference tournament in Indianapolis, Friday, March 12, 2010. Ohio State beat Michigan 69-68.