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Table 1 Time periods for the different DQA 57Co flood phantoms used over the course of the study

From: A study of SPECT/CT camera stability for quantitative imaging

57Co flood phantom’s activity source reference year Time period flood(s) used
Flood A: 2011 5/2/2012–7/9/2012
Flood B: 2010 + 2011 7/26/2012–10/24/2012
Flood C: 2011 + 2012 12/19/2012–5/2/2013