Use of T1-weighted/T2-weighted magnetic resonance ratio to elucidate changes due to amyloid β accumulation in cognitively normal subjects oleh Fumihiko Yasuno, Hiroaki Kazui, Naomi Morita, Katsufumi Kajimoto, Masafumi Ihara, Akihiko Taguchi, Akihide Yamamoto, Kiwamu Matsuoka, Masato Takahashi, Jyoji Nakagawara, Hidehiro Iida, Toshifumi Kishimoto, Kazuyuki Nagatsuka