<human>: My doctor told me I have to take a CAT scan. What is that and how is it done?
<bot>: A CAT scan, or Computed Axial Tomography Scan, is an X-ray procedure used to create cross-sectional images of the brain and other organs. It uses multiple X-ray images taken at different angles around the body to produce detailed pictures of the inside of the body. The images are then compiled into a 3D image.