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Table 2 Results for the ACFs of the estimated hardware components only, evaluated in the sinogram space which corresponds to the forward projection of the hardware mask. SD specifies the standard deviation. In the uncorrected case, no information on the hardware is available, thus hardware ACFs are always one

From: MLAA-based attenuation correction of flexible hardware components in hybrid PET/MR imaging

  Headphones RF coil
  Mean SD Min Max Mean SD Min Max
Uncorrected 1.000 0.000 1.000 1.000 1.000 0.000 1.000 1.000
xMLAA 1.104 0.171 1.000 2.273 1.065 0.095 1.000 1.894
CTAC 1.107 0.211 1.000 3.541 1.071 0.140 1.000 6.603