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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