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MRI with DBS for Radiology

Conducting an MRI

MRI Guidelines for Deep Brain Stimulation Systems provides comprehensive safety information and instructions for MRI head-only scans and MRI full-body scans of patients implanted with DBS systems, including how to identify full-body and head-only eligible DBS systems, how to check and set the DBS system prior to the MRI, and what type of MRI machine and settings to use.

Using the Guidelines

It is important to read the guidelines in their entirety before conducting an MRI on a patient with any implanted Medtronic deep brain stimulation component. Contact a Medtronic representative for technical support or training related to the guidelines. 

Failure to follow all warnings and guidelines related to MRI can result in serious and permanent injury, including coma, paralysis, and death.

A responsible individual with expert knowledge about MRI, such as an MRI radiologist or MRI physicist, must assure all procedures in this guideline are followed and that the MRI scan parameters comply with the required settings, both for the prescan (tuning) and during the actual MRI examination. The responsible individual must verify that parameters entered into the MRI system meet the guidelines.


Contraindication

Certain MRI procedures - Use of a full body transmit radiofrequency (RF) coil, a receive-only head coil, or a head transmit coil that extends over the chest area is contraindicated for patients with the following implanted DBS systems or system components: 

  • Soletra® Model 7426 neurostimulator
  • Kinetra® Model 7428 neurostimulator
  • Activa® SC Model 37602 neurostimulator
  • Model 64001 and Model 64002 pocket adaptors implanted with any DBS system

Tissue lesions from component heating, especially at the lead electrodes, resulting in serious and permanent injury including coma, paralysis, or death, can occur if a contraindicated MRI scan is performed on a patient with these DBS systems. 


Determining Patient Eligibility

The clinician who manages the patient’s treatment with deep brain stimulation must determine whether the patient is eligible for an MRI scan, and communicate eligibility and instructions to the radiology center.

The deep brain stimulation system should be working, and the leads and extensions should be intact and undamaged. Performing an MRI on a patient with a broken lead, extension, or pocket adaptor conductor can result in serious and permanent injury, including coma, paralysis, and death.

Use the DBS MRI Eligibility Sheet to identify MRI scan-type eligibility and ensure the DBS system is prepared for the MRI scan.


Scanning Conditions: Full-Body Eligible Systems

Applicable devices: Activa® PC model 37601, Activa RC model 37612, Activa SC model 37603

Medtronic DBS systems eligible for MRI scans of the entire body (full-body eligible) must be scanned under the following conditions:

  • 1.5-tesla (T) horizontal closed bore
  • Maximum spatial gradient of19 T/m (1900 gauss/cm)
  • RF transmit/receive body coil (built-in) or RF transmit/receive head coil
  • Maximum RF power of 2.0 µT B1+rms (B1+ root mean squared)
  • If B1+rms is not available, a maximum RF power of 0.1 W/kg (0.05 W/lb) whole body and head SAR (specific absorption rate). Using a SAR setting may result in a more restrictive MRI scan.
  • Gradient slew rate limited to 200 T/m/s

For comprehensive safety information and instructions, refer to: MRI Guidelines for Medtronic Deep Brain Stimulation Systems.


Scanning Conditions: Head-Only Eligible Systems

Applicable systems: Activa SC model 37602, Kinetra® model 7428, Soletra® model 7426

Medtronic DBS systems eligible only for MRI scans of the head must be scanned under the following conditions.

  • 1.5-tesla (T) horizontal closed bore
  • RF transmit/receive head coil only
  • Maximum RF power of 0.1 W/kg (0.05 W/lb) head SAR
  • Gradient slew rate limited to 200 T/m/s

For comprehensive safety information and instructions, refer to: MRI Guidelines for Medtronic Deep Brain Stimulation Systems.


Patient Preparation

Instruct the patient to bring to the MRI test:

  • DBS Patient Programmer
  • Medtronic Device Identification Card or similar record
  • Completed DBS MRI Eligibility Sheet

After the MRI

The DBS system does not need to be checked after the MRI scan. If it was turned off for the MRI, it will need to be turned back on as instructed in the MRI guidelines. If the device was programmed in bipolar mode and remained on during the MRI scan, it may need to be set back to the patient’s normal programming.

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