MRI Scans And Seizures

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1) Does age of a patient play a role in how much of his or her brain causes seizures and what parts of their brain cause seizures? I remember learning that Dr. Ben Carson did a hemispherectomy (one of the hemispheres of the brain or half of the brain is removed) in a little girl (age 4-5) who had seizures and that the girl had no brain impairment later in life.
2) Can a patient who has an MRI scan done on them experience negative side effects due to the MRI equipment or procedure? I know that exposure to too much X-ray radiation can be detrimental to one's health. Since MRI scans produce better images of the brain than CT scans, which use X-ray particles, I was wondering there are patient related reasons when doctors may opt to order a CT

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