MAPT and frontotemporal dementia: However, a comparison of FTP and [18F]PM-PBB3 in FTD patients with MAPT mutations described different findings based on the Tau conformers (3R/4R and 4R), reporting promising results concerning the in vivo detection of both 3R/4R and 4R Tau domains with [18F]PM-PBB3 [127].