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If it is "worse headache of your life" get to an ER asap.
MRI is annoying because it is loud and general takes long.
CT is easy but with contrast you get IV and can fuckup kidneys.
Either can detect problems in brain, if they suspect stroke they'll probably do MRI. CT is bit different views.
MRI is magnetic so if you have metal pins or ghetto tats that'll be a problem.
CT is like a thousand xrays at once so yes they say to minimize ct scans because of tumor concerns.
I've had a few dozen CT's in the last 5 years and a bunch of MRI's too. Neither is a big deal so do whatever the docs suggests unless you're real worried about something specific.
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