Magnetic resonance imaging or MRI has become a very common investigation.It provides unsurpassed soft-tissue contrast and multiplanar capability with spatial resolution that approaches that of CT.
It is a powerful diagnostic tool and helps to evaluate structures that are otherwise use to require invasive investigations.
Generally, MRI is a very safe investigation but there are conditions where it should not be done at all and conditions where it should be used with caution.
Absolute Contraindications – Conditions where MRI Should Not Be Used At All
- Intracerebral aneurysm clips
- Cardiac pacemakers
- Automatic defibrillators
- Biostimulators like Vagus nerve stimulators, loop recorders, insulin pumps, cochlear implants, deep brain stimulators etc
- Implanted infusion devices
- Internal hearing aids
- Metallic foreign bodies in orbit. [Xray would help to locate if any]
Note: Cardiac valve prostheses can be scanned safely.
Relative Contraindications [Use MRI With Caution Weighing Risk Versus Benefit]
- First-trimester pregnancy
- Middle ear prostheses
- Penile prostheses.
Generally, internal orthopaedic hardware and orthopaedic prostheses are safe to scan.
Note: Medical device patients should always present complete information (manufacturer, model, serial number and date of implantation) about all implants and show that to referring doctor as well as to radiologist at MRI center.
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