Department of Radiation Science, Hirosaki University Graduate School of Health Sciences, 66-1, Hon-cho, Hirosaki, 036-8564, Japan

Shingo Terashima, Minoru Osanai & Yoichiro Hosokawa

Graduate School of Biomedical Science and Engineering, Hokkaido University, Kita15, Nishi7, Kita-ku, Sapporo, 060-8638, Japan

Junta Sano

Department of Radiology, Akita University Hospital, 44-2, Hiroomote Hasunuma, Akita, 010-8543, Japan

Keisuke Toshima

Department of Oral and Maxillofacial Surgery, School of Dentistry, Health Sciences University of Hokkaido, Tobetsu-Cho, Ishikari-gun, Hokkaido, 061-0293, Japan

Kentaro Ohuchi