> She said she had called him into the room after she had a scan on Wednesday.
Part of me wonders why the wife felt empowered to invite her husband, who she knew was wearing a giant metal necklace, into the MRI room after her scan. The hospital would have been very clear with her about the dangers of wearing any metal in the room even when the scanner was not running especially because it's common for women to wear jewelry containing various metals and alloys.
Presumably, the husband would have been part of those conversations as well, and thus, should have refrained from joining her in the room anyway, so he isn't completely absolved of responsibility.
It seems there's plenty of blame to go around.