Magnetic Resonance Imaging, or MRI, is a noninvasive diagnostic tool used to create three-dimensional images of the inside of the human body. These images are similar to images produced by a CT scan, but MRI scans are able to produce more detailed images of the body’s soft tissues. These clearer images, which are produced using a magnetic field, mean MRI scans are valuable when it comes to diagnosing infection, cancer, internal bleeding or trauma.