Assessment of olfactory nerve by SPECT-MRI image with nasal thallium-201 administration in patients with olfactory impairments in comparison to healthy volunteers. oleh Hideaki Shiga, Junichi Taki, Kohshin Washiyama, Junpei Yamamoto, Sakae Kinase, Koichi Okuda, Seigo Kinuya, Naoto Watanabe, Hisao Tonami, Kichiro Koshida, Ryohei Amano, Mitsuru Furukawa, Takaki Miwa