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. 2016 Dec;2(4):353–360. doi: 10.18383/j.tom.2016.00205

Table 2.

Measured Rs for the X-Cal PET Phantoms

Batch Date N R mean R SD u (%)
1 2011 4 0.95 0.006 0.92
2 2013 10 0.92 0.011 1.28

The last column is the average COV of the voxel values in the ROIs, u, and is a metric of spatial uniformity.