Disclosed herein is a medical device configured to assist detecting at least one marker disposed on a subject during radiotherapy, and adjusting the positon of the subject accordingly. The medical device comprises a base, a motor, a moveable board, a detector and a controller. The moveable board is disposed on the base and coupled with the motor, and the detector is configured to detect the marker disposed on the subject. The controller is electrically coupled with the detector, and is configured to drive the moveable board to move back and forth along the longitudinal direction of the base.在此揭示一種醫療輔助裝置,用以於一放射治療過程中感測一個體身上至少一標記物的位置而相應地移動個體的治療位置。所述醫療輔助裝置包括基座、驅動器、長形活動板、感測器和控制器。所述長形活動板設於基座上且與驅動器耦接,所述感測器是用來偵測所述標記。所述控制器與驅動器和感測器電性耦接,用以驅動長形活動板沿著基座長度方向前後移動。100‧‧‧醫療輔助裝置110‧‧‧基座120‧‧‧驅動器130‧‧‧長形活動板150‧‧‧感測器151‧‧‧橫跨件153A、153B‧‧‧側板155A、155B‧‧‧第一溝槽156‧‧‧第一支架
