THE AAPM RSNA PHYSICS TUTORIAL FOR RESIDENTS - BASIC PHYSICS OF MR-IMAGING - AN INTRODUCTION

This article provides an introduction to the basic physical principles of magnetic resonance (MR) imaging. Essential basic concepts such as nuclear magnetism, tissue magnetization, precession, excitation, and t issue relaxation properties are presented. Hydrogen spin density and t issue relaxation times TI, T2, and T2 are explained. The basic elemen ts of a planar MR pulse sequence are described: section selection duri ng tissue excitation, phase encoding, and frequency encoding during si gnal measurement.