PT Journal AU Mittone, A Gasilov, S Brun, E Bravin, A Coan, P TI A single-image method for x-ray refractive index CT SO Physics in Medicine and Biology PY 2015 BP 3433 EP 3440 VL 60 IS 9 DI 10.1088/0031-9155/60/9/3433 LA english ER