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. Author manuscript; available in PMC: 2012 Oct 17.
Published in final edited form as: Cephalalgia. 2011 Aug 4;31(12):1254–1265. doi: 10.1177/0333102411408360

Figure 2.

Figure 2

Axial 23Na MRI images of the rat head before and after central sensitization. (a) Sum of two 21-minute 23Na MRI axial scans of a control rat. (b) Sum of two further scans immediately after saline injection in the same animal. (c) Difference in voxel intensity (b)–(a). (d) Sum of three 21-minute 23Na MRI axial scans of another animal; (e) Sum of three further scans immediately after NTG injection in the same animal. (f) Difference in voxel intensity (e)–(d). This demonstrates the distinct increase in sodium as a consequence of NTG injection.