Among the clinically applied tau radiotracers, [18F]MK6240 was ranked first, followed by [18F]THK5351, [18F]THK5117, [11C]PBB3, [18F]flortaucipir, [18F]THK5317, [18F]FDDNP, [18F]T808, and [18F]THK523, based on the KD values measured using AD brain homogenates. Here, MAPT is linked to Alzheimer disease.