Fig.1.
Concordance and discordance between amyloid markers. CSF Aβ1–42 and [18F]Florbetapir ([18F]AV45) PET (visual, SUVRCB, SUVRWM, and VT) (A) were compared to CSF Aβ1–42/Aβ1–40 and [18F]AV45 PET (same measurements as described for A) (B). Concordance increased for all four [18F]AV45 PET measurements when considering the CSF ratio. Especially, discordant CSF negative subjects became concordant CSF positive. Aβ, amyloid-β; [18F]AV45, [18F]Florbetapir; CB, cerebellar grey matter; CSF, cerebrospinal fluid; SUVR, standardized uptake value ratio; VT, total volume of distribution; WM, whole subcortical white matter.