Doppler evaluation allows analysis of blood flow Disadvantages Doesn't show function, only anatomy. Difficult with obese, immobile patients. Hard to see deep structures. Can't see through bone or air. Hydrogen ions are moved and deflected to generate image.
Patient goes into long, thin tunnel while lying on table.
No toxic contrast necessary. Allows multi-planar imaging Especially good for bones, CNS, joints Disadvantages Expensive Claustrophobia, sometimes a big problem. Limits patients and procedures which can be performed. Not available everywhere. Nuclear Medicine Radioisotopes are injected into a patient and emit rays of known energies.