RadioGraphics, Vol 15, 683-696, Copyright © 1995 by Radiological Society of North America
Quality of clinical MR images and the use of contrast agents
JL Creasy, CL Partain and RR Price
Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN 37232-2675, USA.
Attempts to optimize the quality of magnetic resonance images must balance
the competing needs for high spatial resolution, high signal-to- noise
ratio, a large number of sections, and a reasonable imaging time. These
factors, which determine the ultimate image quality, are affected by a
number of variables, including the field of view, the matrix and pixel
size, choice of repetition time and echo time, section thickness, and the
number of signals averaged. The manner in which these variables interrelate
and their effect on the ultimate image quality are important in order to
craft the most appropriate examination for each individual patient. A
second major effect on soft-tissue contrast is the use of paramagnetic
agents. The spectrum of utility of these agents within the central nervous
system and the body is increasing. A large number of new agents are also
being investigated, primarily for use outside the central nervous system.
