Medical imaging.
D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D011859:Radiography / Q000009:adverse effects / Q000379:methods*; D014055:Tomography, Emission-Computed / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014465:Ultrasonics / Q000379:methods*