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Table 1 ROI analysis of the emission image. Drawn ROIs nearby the headphones location and results

From: Alternative headphones for patient noise protection and communication in PET-MR studies of the brain

Phantom only (reference) Phantom with headphones Phantom with earphones
Mean (kBq/cc) CV* (%) Mean (kBq/cc) CV* (%) Deviation to reference Mean (kBq/cc) CV* (%) Deviation to reference (%)
Ccentral ROI 24.6 37 24.5 37 0.4 24.2 36 1
Right ROI 27.2 33 24.7 35 10 27.0 33 0.7
Left ROI 23.2 44 21.0 45 10 23.0 44 0.9
  1. *Coefficient of variation