What is the difference between MRI & CAT Scan?
CAT scans are a form of x-ray, in which the x-ray source and the film or digital detector plate move together so that only a thin slice of the patient’s body is in focus; this reduced radiation dose somewhat, and allows much sharper images than the traditional x-ray, which images the entire thickness of the body part at once. MRI scans do not use radiation; a large magnetic field temporarily lines up all water molecules in the body, and then a smaller, very brief magnetic field (the click you hear) makes some of the molecules move out of alignment. As they return to where they were before, they give off a radio-frequency signal which can be captured and computed into an image.
