SCS Therapy: The Complete Guide
Part 4: MRI Scans (In Detail)
What Is an MRI? -- Why Metal Can Be a Problem
MRI (Magnetic Resonance Imaging) uses a very strong magnetic field and radio waves to create detailed images of the inside of your body. Unlike X-rays and CT scans, MRI does not use radiation, so there is no concern about radiation exposure even with repeated scans. MRI is particularly good at examining the condition of the spine and nerves in detail.
However, because MRI uses very strong magnets, special precautions are needed if you have metal inside your body. Metallic implants can pose the following risks:
- Heating -- Metal components may absorb energy from the magnetic field and heat up
- Movement or distortion -- The strong magnetic force may pull on or shift the metal
- Image distortion -- Images may be inaccurate in the area around the metal
For this reason, metallic objects are generally prohibited inside the MRI scanning room.
SCS and MRI -- Getting Your Scan Safely
The SCS pulse generator (IPG) and leads contain metal, but each manufacturer has used special materials and designs to make their devices MRI-compatible. The major SCS devices currently on the market can undergo MRI scans under specific conditions.
However, having an SCS does not mean you can freely get an MRI at any hospital. Prior confirmation and preparation are always required for the following reasons:
- There are many types of MRI machines, and the conditions for scanning depend on the specific combination of your SCS device and the MRI system
- The radiologist and MRI technicians need to be experienced with scanning SCS patients
- In some cases, your SCS may need to be switched to MRI mode beforehand
Current MRI Compatibility
Current major SCS devices are "conditionally MRI-compatible."
| Feature | Details |
|---|---|
| 1.5T MRI | All three major manufacturers -- most current models allow conditional full-body scanning |
| 3.0T MRI | Medtronic's latest rechargeable model supports conditional full-body 3.0T MRI. Other manufacturers currently support up to 1.5T |
| Scan duration | Limits apply (varies by model) |
| Pre-scan setup | Switching to MRI mode is required |
Key point: Even within the same manufacturer, the specific conditions for MRI scanning vary depending on the model number of the pulse generator, the type of lead, and the position of the lead. If you need an MRI, always confirm with the hospital where your SCS was implanted. When visiting the hospital, be sure to bring your SCS patient identification booklet and controller (remote). The booklet contains the model number and lead information, which is essential for determining whether an MRI can be performed safely.
Steps for Getting an MRI Scan
| Step | What happens |
|---|---|
| 1 | An MRI scan is needed |
| 2 | Contact the hospital where your SCS was implanted |
| 3 | Confirm device information (model number, settings) |
| 4 | Provide this information to the MRI facility |
| 5 | Switch the SCS to MRI mode (if required) |
| 6 | The MRI scan is performed |
| 7 | After the scan, the SCS is returned to normal mode |
Important Reminders
- Do not get an MRI on your own without checking first
- Always carry your patient identification card
- Even in an emergency, inform the medical team about your SCS first