@shar1120 Your doctor will be the best source for you to make the decision. A PET scan will involve radiation. From Health line: https://www.healthline.com/health/mri-vs-pet-scan#:~:text=While%20CT%20and%20MRI%20scans,MRIs%2C%20PET%20scans%20use%20positrons.

Please let me know what direction you head to, will you? And, good luck!
Ginger