RT Journal Article SR Electronic T1 What is T+? A Gordian Knot of Tracers, Thresholds & Topographies JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP jnumed.120.245423 DO 10.2967/jnumed.120.245423 A1 Victor L. Villemagne A1 Brian J. Lopresti A1 Vincent Dore A1 Dana Tudorascu A1 Milos D. Ikonomovic A1 Samantha Burnham A1 Davneet Minhas A1 Tharick A. Pascoal A1 N. Scott Mason A1 Beth Snitz A1 Howard Aizenstein A1 Chester A. Mathis A1 Oscar Lopez A1 Christopher C. Rowe A1 William E. Klunk A1 Ann D. Cohen YR 2020 UL http://jnm.snmjournals.org/content/early/2020/12/31/jnumed.120.245423.abstract AB In this review we examine, in the context of the AT(N) framework, the available evidence as well as the potential alternatives on how to establish tau-positivity (T+) for multiple tau imaging tracers in order to come to a consensus for “normal” and “abnormal” tau imaging values that can be universally implemented in clinical research and therapeutic trials.