A patient table comprises: a curved base plate, a support face arranged over the curved base plates concave side, a planar table top removable placed over the support face surface and the planar table top having a flat support surface opposite form the support face the planar table top being contiguous to the support face. In particular in the patient table assembly with longitudinal sides (a) longitudinal groove(s) are provided along one or both the longitudinal sides in the flat support surface and at the longitudinal groove(s) indentations, in particular notches, are provided in the flat support surface and transverse to the groove(s).