CT Scan, MRI and X-RAY Before Performing Sliding Genioplasty or Facial Contouring Procedure?

Hello, I wanted to know what kind of tests are ordered before doing sliding genioplasty, mandibular reduction, or zygoma reduction. IS it MRI, CT scan, or X-Ray? I was hoping that a doctor can use a MRI and that would be sufficient. I do not see the point in exposing myself to high amounts of radiation (CT scan) just for cosmetic purposes.

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