Fig. 4From: Spatial geometric and magnetic resonance signal intensity changes with advancing stages of nucleus pulposus degenerationSpecific Cases a An example of Pfirrmann Grade I disc. The coordinate of the weighted center related to the geometric center was (0.093, −0.038). b An example of Pfirrmann Grade II disc. The coordinate of the weighted center related to the geometric center was (1.923, 0.062)Back to article page