- Limited ability in imaging the skull and facial bones -- conventional X-ray or CT scan is better in demonstrating bone details.
- Compared to CT scanning, MRI is less sensitive in demonstrating acute hemorrhage, as in subarachnoid hemorrhage and hemorrhagic infarction.
- Hard to depict calcifications
- MRI does not always distinguish tumor tissue from edema fluid
- Less sensitive in detecting small abnormalities compared to CT scans (poor spatial resolution)
- Inability to scan critically-ill patients requiring life support systems and monitoring devices that employ ferromagnetic materials.
- May be dangerous in scanning patients with metal implants and other metal objects
- May provoke claustrophobia
- Longer exam time compared to CT scans
- Safety in scanning pregnant women is not known.
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