Muscle imaging has been used largely as an adjunct in the assessment o
f patients with muscle disease and has been reported in descriptive te
rms only. Developments in computer-based image analysis techniques app
lied to muscle have enabled the quantification of muscle images using
ultrasonography, computed tomography and magnetic resonance techniques
. In conjunction with physiological measurements of muscle force, accu
rate determinations of muscle section area have allowed the determinat
ion of force per unit of cross-sectional area, This important measurem
ent is essential if therapeutic approaches in muscle disease are to be
adequately assessed. In this review the uses and merits of different
imaging techniques are described with reference to new developments in
quantitative analysis of muscle images and the possible utilisation o
f these techniques in neuromuscular disease is discussed.