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. 1998 Jun;207(3):587-91.
doi: 10.1148/radiology.207.3.9609877.

Yasargil aneurysm clips: evaluation of interactions with a 1.5-T MR system

F G Shellock  1 , E Kanal
Affiliations

Yasargil aneurysm clips: evaluation of interactions with a 1.5-T MR system

F G Shellock et al. Radiology. 1998 Jun.

Abstract

Purpose: To evaluate the magnetic field interactions with Yasargil aneurysm clips exposed to a 1.5-T MR system.

Materials and methods: Sixteen Yasargil aneurysm clips made with Phynox (10 clips returned to the manufacturer due to suspected magnetic field interactions and six clips obtained from the manufacturer in sterile packages) were tested for magnetic field interaction at 1.5 T by using techniques to assess magnetic field-induced translational (deflection angle test) and torque (changes in alignment or rotation) forces.

Results: None of the aneurysm clips demonstrated magnetic field interactions; that is, deflection angles were zero and there were no changes in alignment or evidence of rotational forces present.

Conclusion: It is safe to perform MR procedures at 1.5 T or less in patients with Yasargil aneurysm clips made with nonferromagnetic material.

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