Why Is PET Imaging Contraindicated for Patients with Titanium Dental Implants?

In summary, the imaging method that is contraindicated for patients with a titanium dental implant is PET. This is because titanium is electrically conductive and can be heated by induction, which can cause problems during an MRI scan. While there are conflicting opinions on the safety of titanium in MRI, it's possible that its effect on a tooth could be a factor in the contraindication.
  • #1
BrnoStudent
7
0
19. Which imaging method is contraindicated (not allowed) for patients with a titanium dental
implant?
a) CT b) MRI c) PET d) SPECT e) mammography

I thought the answer was MRI, but the correct answer is PET. Can anyone explain why this is. Thanks.
 
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  • #2
Hi BrnoStudent! :smile:

No-one else has answered, so I'll have a go …

According to wikipedia (at http://en.wikipedia.org/wiki/Magnetic_resonance_imaging#Magnetic_field), there are two problems with metals under MRI: movement and heating.

Titanium isn't ferromagnetic, so it won't move.

But it's electrically conductive, so it can be heated by induction.

(Though there are plenty of websites that contradict this, and say that titanium is safe for MRI … maybe it has something to do with the effect of heating on a tooth? :confused:)
 

FAQ: Why Is PET Imaging Contraindicated for Patients with Titanium Dental Implants?

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