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highlighting the consequence of too many imaging studies, like xrays and CT scans , which are the biggest contributor to an individual's total radiation exposure in a lifetime. Americans get more imaging radiation... 
York Times)
Pregnant women are exposed to twice the amount of radiation from medical scans... the patient or fetus to ionizing radiation. The data showed that the use of scanning tests is increasing far... 
Radiation is emitted in various forms. Recently, CT scan radiation has preoccupied (or “absorbed... radiation. Ionizing radiation may break molecules into pieces, creating ionic free radicals...
, for instance, a CT heart scan (not angiography) at a modest radiation cost.
Detail on radiation...
The NY Times ran an article called
With Rise in Radiation Exposure, Experts Urge...
calling for an open discussion of the facts about radiation hazards from computed tomography scanning (CT scans) in light of recent public concerns and news reports about radiation dose.
Medical physicists... 
scan procedures that were the issues with radiation, and during the time span covered here... who may have been overexposed to radiation during CT brain perfusion scans at the Los Angeles hospital.
The lawsuit was filed...
for exploratory surgery. But CT scans involve a much higher radiation dose than conventional X-rays. A chest CT scan exposes the patient to more than 100 times the radiation dose of a typical chest X-ray.
...
Beware of the media reports now being issued that warn that "CT heart scans" pose a risk for cancer.
One report can be viewed at
http://www.webmd.com/cancer/news/20070717/ct-heart-scan-radiation...
. Black said.
Unlike C.T. scans or X-rays, which transmit radiation through the body to produce images...The Scan That Didn’t Scan
By GINA KOLATA
19 oct 2008--This is a story about M.R.I. ’s...
The scan was negative.
Negative.
Negative.
14 hours later, and I still can not believe it. That was so cool.
So, the scan stuff was done at like 9:45AM, but we needed my bloodwork... 
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