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

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PET imaging is contraindicated for patients with titanium dental implants due to the potential for interference with the imaging process. Unlike MRI, which poses risks of movement and heating due to the magnetic field, PET scans can be affected by the presence of metal, leading to inaccurate results. While titanium is not ferromagnetic and generally considered safe for MRI, its electrical conductivity raises concerns about heating. There are conflicting opinions on the safety of titanium in MRI, but the consensus in this discussion is that PET is the imaging method that should be avoided. Understanding these limitations is crucial for ensuring patient safety and accurate imaging outcomes.
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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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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:)
 

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