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Radiofrequency Safety for Interventional MRI Procedures1

Summary: Radiofrequency Safety for Interventional MRI
Ergin Atalar, PhD
During an interventional magnetic resonance imaging
(MRI) procedure, various kinds of surgical and interven-
tional devices, such as needles, catheters, and guidewires,
that contain metallic components are used inside the MRI
scanner. Interference of these devices with radiofrequency
pulses is known to be a possible health risk. The radiofre-
quency (RF) power delivered by an RF body coil may
become concentrated on these metallic devices and may
cause a significant increase in the specific absorption rate
(SAR), potentially resulting in excessive local temperature
rise and burns (1).
This risk is very well known and has been extensively
studied (2). The source of this problem is also well
known (3). This temperature rise has been shown in a
multitude of studies by many investigators (48). Unfor-
tunately, absolute values of the results are conflicting,
primarily because the methods used in these measure-


Source: Atalar, Ergin - Department of Electrical and Electronics Engineering, Bilkent University


Collections: Engineering; Biology and Medicine