ABSTRACT
Magnetic resonance imaging provides the best soft tissue contrast available in radiology and is an essential part of many diagnostic workups. This chapter will explain the following:
• Basic principles (magnetic moment of protons, precession, Larmor equation) • Excitation and relaxation (RF pulses, spin-lattice and spin-spin relaxation) • Spatial localisation using magnetic ‰eld gradients (frequency and phase
encoding, slice selection) • Image reconstruction using k-space • Artefacts (effects of movement, ´ow, metal, encoding artefacts) • Magnetic resonance (MR) angiography and diffusion-weighted imaging
CONTENTS
16.1 Introduction ........................................................................................................................564 16.2 Basic Principles of Nuclear Magnetism ..........................................................................565 16.3 Effect of an External Magnetic Field ...............................................................................566
