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CT Scan and Amount of Radiation

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Hi there!

I have a pretty basic question. Forgive me if it sounds unreasonable - I ask without any knowledge about how it works. So... i've came a cross a table that informs you what type of CT scans (head, stomach, heart, etc.) gives you the least and the most amount of radiation. Can i know how it works exactly? Is the amount of radiation something which could be simply selected on the machine by a technican who does the tests? Or is the amount of radiation unchangeably assigned to the machine and only the length of the test is the only factor that determines how much radiation you'll get?

Thank you!

submitted by /u/IamNotShepard
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source https://www.reddit.com/r/Radiology/comments/srumo1/ct_scan_and_amount_of_radiation/
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