Scanning the scans: comparing CT, MRI, and PET scans.
D008279:Magnetic Resonance Imaging / Q000379:methods*; D011859:Radiography / Q000009:adverse effects / Q000379:methods; D014055:Tomography, Emission-Computed / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*