CT scans are a type of X-ray. MRI's use magnetic fields and don't involve radiation. It depends on what is being looked for as to which one is more suitable. See http://hanfordsentinel.com/news/loca...9bb2963f4.html for more detailed information.
I have had both and I didn't find it frightening.
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Dx MDS RAEB 10% blasts + hypogammaglobulinemia, Sep 2011. Jan 2012 BMB - blasts down to 2% w/out treatment so BMT cancelled. Re-diagnosis RCMD. Watch and wait from Feb 2012. IVIg 5-weekly. New diagnosis Oct 2019 AML 23% blasts in marrow, 10% blasts in peripheral blood.
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