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Abstract #4188

Radiofrequency Heating of MR-conditional Needles during Interventional Magnetic Resonance Imaging at 1.5 and 3 Tesla Field Strengths

Iman Khodarahmi1, Luke W Bonham2, Clifford Weiss3, and Jan Fritz3

1Department of Radiology, Musculoskeletal Imaging, New York University School of Medicine, New York, NY, United States, 2Johns Hopkins University School of Medicine, Baltimore, MD, United States, 3Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, United States

MR conditional 10, 15 and 20 cm cobalt chromium needles pose minimal risk of thermal injury when placed at a 45° to 90° angle relative to the patient table even after 5 minutes of continuous imaging with interventional pulse sequences (< 2.5 ˚C temperature rise). Higher temperature rises of up to 8˚C (3T) and 22˚C (1.5T) occur when needles are oriented parallel to the static magnetic field. If the needle must be placed in such orientation, low Specific Absorption Rate pulse sequences and needle lengths that differ substantially from half of the radiofrequency pulse wavelength should be used.

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