Christopher Hess, MD, PhD, Neuroimaging Part 3: Understanding Risks and Benefits

CT scans are less expensive, faster, and more accessible. It also reveals more bone detail. Patients that are unstable are good candidates because hemorrhage, hydrocephalus and herniation can be quickly identified. It can be used as a screening tool.
While MRI's are slow and more expensive, they don't require the use of radiation. If patient has a normal CT, this can be used to identify brainstem & cerebellar strokes.
Contrast media such as iodine can be used in a CT scan. Gadolinium can be used in an MRI scan. Both come with various risks.
There are also radiation risks, which must be carefully considered for CT scans. Whereas for MRI scans, items on the patient and in the room should be reviewed due to the strong nature of the electromagnets used.
More on Dr. Hess: profiles.ucsf.e...
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