<P> The CT scan was introduced in the 1970s and quickly became one of the most widely used methods of imaging . A CT scan can be performed in under a second and produce rapid results for clinicians , with its ease of use leading to an increase in CT scans performed in the United States from 3 million in 1980 to 62 million in 2007 . Clinicians oftentimes take multiple scans , with 30 % of individuals undergoing at least 3 scans in one study of CT scan usage . CT scans can expose patients to levels of radiation 100 - 500 times higher than traditional x-rays , with higher radiation doses producing better resolution imaging . While easy to use , increases in CT scan use , especially in asymptomatic patients , is a topic of concern since patients are exposed to significantly high levels of radiation . </P>
<P> The CT scan was introduced in the 1970s and quickly became one of the most widely used methods of imaging . A CT scan can be performed in under a second and produce rapid results for clinicians , with its ease of use leading to an increase in CT scans performed in the United States from 3 million in 1980 to 62 million in 2007 . Clinicians oftentimes take multiple scans , with 30 % of individuals undergoing at least 3 scans in one study of CT scan usage . CT scans can expose patients to levels of radiation 100 - 500 times higher than traditional x-rays , with higher radiation doses producing better resolution imaging . While easy to use , increases in CT scan use , especially in asymptomatic patients , is a topic of concern since patients are exposed to significantly high levels of radiation . </P>
a technique for studying brain structure that uses high-resolution x-rays is known as
a technique for studying brain structure that uses high-resolution x-rays is known as
A CT scan
A CT scan