Everyday we are exposed to natural radioactive materials, just by living here on earth.A recent article helps put some radiation test into perspective.
X-rays: X-rays penetrate the body, but not the bones. One chest x-ray gives off the same amount of radiation as a person would receive naturally in ten days.
CT Scans: These are 3-D x-rays, taken multiple times to show several layers of bone and muscle. The amount of radiation varies depending on the area scanned. A CT of the abdomen or spine, for example, equals three years of daily radiation. But a head a head scan equals eight months' worth.
Ultrasound: This test uses acoustic radiation, or sound waves, to shoe an internal body part and does not pose a radiation risk.
MRI: These do not use radiation. Instead, it uses magnets and a radio-frequency pulse that tracks the hydrogen atoms in the body to create an image.
Bone-Density Test: This test uses X-ray technology, but at a very low dose. One scan is equal to one day of natural radiation.
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