Figure 1.

Hand radiograph illustrating region of interest measurement of joint space width at the metacarpal-phalangeal articulation. The joint edges were detected as intensity maximum and the joint space distances were measured with 180 measurement points per centimeter between the two lines, which define the cortical layer of the articulation bones.

Pfeil et al. Arthritis Research & Therapy 2013 15:R27   doi:10.1186/ar4163
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