Radiation dose reduction in CT of the brain: can advanced noise filtering compensate for loss of image quality? - Siemund R; Löve A; van Westen D; Stenberg L; Petersen C; Björkman-Burtscher I; Siemund, Roger; Löve, A; van Westen, D; Stenberg, L; Petersen, C; Björkman-Burtscher, I M (Acta Radiologica, 2012)