Fig. 1From: Quantification of hand muscle volume and composition in patients with rheumatoid arthritis, psoriatic arthritis and psoriasisTop: Axial slice of a T1 weighted fat suppressed MRI hand scan in the metacarpal region. Notice the inhomogeneous intensity distribution of the grey values caused by a bias field, especially in the thenar region (lower left). Bottom: Same slice but with removed bias field by non-uniform intensity normalization (N4ITK)Back to article page