Fig. 5
From: Practical issues and limitations of brain attenuation correction on a simultaneous PET-MR scanner

a LAC at 511 keV calculated from HU using the vendor specific curve. b LAC derived using Siemens scaling
From: Practical issues and limitations of brain attenuation correction on a simultaneous PET-MR scanner
a LAC at 511 keV calculated from HU using the vendor specific curve. b LAC derived using Siemens scaling