Tag: MRI

Dear Dr. Roach: Could you please explain in layman terms the difference between an X-ray, CT scan, MRI and PET scan? — C.D.B. Answer: All four of these tests provide images of the body, which…

Dear Dr. Roach: While chasing my cat, I dove to the ground and both my knees took a beating. They were bruised but felt fine. A few days after this, my left knee started to…