[Fast imaging sequences].

Abstract

Although conventional spin echo and gradient echo sequences are still in general use, the need to improve the temporal resolution of MRI and to study organ function has prompted to develop fast imaging techniques. These techniques are based on different approaches, but present common underlying principles which allow optimize k space fitting. As a result, both contrast and spatial resolution may be improved aside from the capability to reduce scan time. The selection of the most appropriate fast imaging technique will depend on the needed temporal resolution, spatial resolution and contrast. The aim of this paper is to review and explain the basic principles of fast imaging techniques, with emphasis on their advantages, limitations, and clinical applications.