Figure 1. Ex Vivo MRI of Muscular VSD Occluder.
(A) Off-the-shelf occluder with stainless steel screw creating imaging artifact. (B) A similar device after replacement of the device screw to a titanium screw. The device itself is made of nitinol mesh, which is passively visualized on MRI but without significant artifact. MRI = magnetic resonance imaging; VSD = ventricular septal defect.