A Cat Scan (Computed Tomography) and an MRI (Magnetic Resonance Imaging) are two types of medical imaging tests used to visualize parts of the body. A CT scan uses X-rays to create images of internal body structures, while an MRI uses radio waves and a strong magnetic field to create detailed images of body organs and tissues. CT scans are typically used to image bones, while MRIs are used to image soft tissues such as muscles, ligaments, and organs. CT scans are also used to detect tumors, while MRIs are used to diagnose diseases such as stroke, multiple sclerosis, and certain types of cancer. CT scans are faster and less expensive than MRIs, but MRIs produce much higher quality images.