What is an MRI scan used for?
MRI scans are mostly for detecting the density of things inside the body, and a computer can rebuild an image of any “slice” of the body as desired. That’s obviously quite useful to find any abnormality in the shape of any organ or limb. Using a MRI as a lie detector probably came from House. The trick Dr. House used to detect that a patient was lying is a functional MRI. The iron in blood interferes with the MRI’s magnetic field and the computer can be set to underline changes in blood flow. When the patient began making up a story, the part of her brain controling imagination began using more blood than normal, so it appeared on the image. It wouldn’t be a very reliable lie detector though.
