Where can I learn more about RFID tags in a magnetic resonance environment? And can active tags that track patients in real time be used in an MRI machine?
In 2010, a publication called Biomed Central published an article on RFID tags in a magnetic resonance environment, titled "Safety and Reliability of Radio Frequency Identification Devices in Magnetic Resonance Imaging and Computed Tomography." The article concludes, "According to the ASTM standard, a device is considered as MR-safe if it causes no known hazards to patients in all MR environments. Since the RFID tag contains conducting materials, RFID may only be MR-conditional, meaning safe under certain conditions for MR imaging during the scan. Significant increasing of temperature and unexpected strong movements are potential risk factors for patients with an implant during MRI examination."
That same year, a Swiss study found that passive HF tags in wristbands do not significantly interfere with the functionality of MRI or computer tomography machines (see Swiss Study Finds RFID Tags Safe for MRI, CT Scans).
To my knowledge, active tags that track patients in real time cannot be used in an MRI machine.
—Mark Roberti, Founder and Editor, RFID Journal