Wolfgang Wein Alexander Ladikos Detecting Patient Motion in Projection Space for Cone-beam Computed Tomography. 516-523 2011 MICCAI (1) http://dx.doi.org/10.1007/978-3-642-23623-5_65 conf/miccai/2011-1 db/conf/miccai/miccai2011-1.html#WeinL11