The present invention relates to motor assisted movement as well as to mobile X-ray systems comprising at least one bidirectional wheel. Positioning heavy objects in in particular confined spaces with high precision may be a cumbersome and tedious task. Consequently, a motor assisted movement assembly as well as an X-ray system comprising at least one bidirectional wheel is presented. According to the present invention a motor assisted movement assembly (19) comprising at least one bidirectional wheel (18) and a motor arrangement associated with the at least one bidirectional wheel (18) is provided. The motor assisted movement assembly (19) is adapted to move on a surface, wherein the at least one bidirectional wheel (18) is adapted to roll in at least a first direction (20) and in at least a second direction (22), with the first direction (20) and the second direction (22) being non-parallel. The motor assisted movement assembly (19) is adapted to detect an indication of a desired movement (16) of the motor assisted movement assembly (19) relative to the surface and the motor arrangement is adapted to assist the movement of the motor assisted movement assembly (19) relative to the surface in accordance with the indication (16).