This document discusses magnetic resonance imaging (MRI) techniques. It begins by defining MRI as a medical imaging technique using magnets, radio waves, and a computer to produce detailed images of organs and tissues. It then discusses key aspects of MRI systems including magnet field strengths, pulse sequences, and various weightings used to produce different types of images. Specific pulse sequences are described in detail such as inversion recovery, which is used to suppress signals from fat or fluid. Parameters for adjusting pulse sequences are also outlined.