access icon free Role of MRI coils in radio frequency heating of implantable medical devices

MRI for patients with implanted medical devices is usually restricted due to the heating hazard arising from the interaction between the device and the electromagnetic field generated by the RF coil. RF coils used clinically have diverse dimensions and their heating effect remains unexamined. By numerical simulation, the similarity of the phantom magnetic field distribution of various coils was characterised by regression, and the heating around a standard implant was examined by correlation analysis. It was shown that the magnetic field distributions in the phantom were similar (>0.95) in the central area. This similarity was more significantly affected by the coil length rather than the diameter. As for the RF heating, the temperature distributions at the implant tips were much more similar (>0.9999) across all the coils. Although there were some differences in the temperature rise per unit RF magnetic field, these differences were within 20%, especially in the central region. These data reveal the influence of coil dimensions on the RF heating.

Inspec keywords: coils; regression analysis; biomedical MRI; phantoms; temperature distribution; radiofrequency heating; electromagnetic fields; prosthetics; magnetic fields; biomedical equipment

Other keywords: heating effect; correlation analysis; implant tips; coil length; RF heating; regression; temperature distributions; magnetic field distributions; RF coil; phantom magnetic field distribution; radiofrequency heating; electromagnetic field; implantable medical devices; MRI coils; heating hazard

Subjects: Biothermics; Prosthetics and other practical applications; Prosthetics and orthotics; Other topics in statistics; Medical magnetic resonance imaging and spectroscopy; Patient diagnostic methods and instrumentation; Probability theory, stochastic processes, and statistics; Biomedical magnetic resonance imaging and spectroscopy

References

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      • 6. ASTM F2182-11a: ‘Standard test method for measurement of radio frequency induced heating on or near passive implants during magnetic resonance imaging’, 2011.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.0551
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