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. 2003 Feb 24;18(4):284–295. doi: 10.1002/hbm.10085

Figure 1.

Figure 1

A model of PET measurement at a voxel k of a subject i during a task. The observation x i (k) is an accumulated number of photons from mixed activations of several functional components of the brain that the voxel k is involved in during a task. Observation x i (k) is the superimposed activities of functional components at neurons correspondent to the voxel k.