PURPOSE: A method for controlling an X-ray emission range by using a changed electrical signal and a device thereof are provided to easily control an emission range by controlling the size and position of a collimator.CONSTITUTION: An image is displayed (110). An object is photographed on the image. User input for the image is received (120). A collimator is controlled according to the user input (130). An X-ray emission range is controlled according to the size and position of the collimator (140).COPYRIGHT KIPO 2013[Reference numerals] (110) Image is displayed (120) Object is photographed on the image. User input for the image is received (130) Collimator is controlled according to the user input (140) X-ray emission range is controlled according to the size and position of the collimator (AA) Start (BB) End대상체가 촬영된 영상을 디스플레이하고, 디스플레이된 촬영 영상에 대한 사용자 입력을 수신하며, 그리고 수신된 사용자 입력에 따라 콜리메이터(collimator)를 제어하고, 콜리메이터의 크기 및 위치에 따라 엑스레이 조사 범위가 조절되는 엑스레이 조사 범위 조절 방법이 개시된다.
