The majority of glucose monitors are classed as MR Unsafe and must be removed before the scan can proceed. However, there is currently one CGM sensor that is MR Conditional the Eversense (and Eversense XL) CGM sensor. Despite being an MR Conditional device, please note that the smart transmitter component for this device is MR Unsafe and must be removed. Please see the notes below for more information on the sensor and transmitter. The conditions for the sensor are as follows:
• The Eversense Smart Transmitter must be removed before undergoing an MRI procedure
• Static magnetic field of 1.5 or 3.0T
• Maximum spatial field gradient of 19 T/m (1900 Gauss/cm)
• Maximum MR system reported, whole body averaged specific absorption rate (SAR) of 4 W/kg (First Level Controlled Operating Mode) for 15 minutes of continuous scanning, or SAR of 2 W/kg (equivalent to Normal Operating Mode) for 30 minutes of continuous scanning.
This advice will be reviewed on a regular basis. Should you have any queries or information to update this policy, please email MRI Physics.
The devices investigated in this review included:
– Abbott Freestyle Libre
– DexCom Seven System CGM
– Echo Therapeutics Symphony Glucose Monitoring System
– Eversense (and Eversense XL) CGM system
– Medtronic iPro2
– Medtronic MiniMed Paradigm REAL-Time Insulin Pump CGM
– Medtronic Guardian Connect CGM
– Medtech/GlucoRx AiDEX CGM
For risk assessment, see link below…
Additional background information and discussion
The Eversense and Eversense XL Sensors are the component that is inserted under the skin (upper arm) and last up to 90 and 180 days, respectively. The Smart Transmitter is removable and worn externally over the sensor. This powers the sensor and sends data via Bluetooth to a mobile device. The Smart Transmitter is MR Unsafe and must be removed prior to entry into the MR Environment.
