Method and system for register operating space

A system for registering operating space, the system comprising:

• a back bracing comprising a plurality of positioning marks which are configured to be imaged in a computer tomography image, wherein the back bracing is configured to be worn by a patient;
• a computer system configured to recognize the positioning marks in the computer tomography image and compute image coordinates of the positioning marks in an image space;
• and
• a robotic arm comprising a base which is configured to connect to the back bracing in an operating space after the computer tomography image is generated, wherein the robotic arm is configured to contact the positioning marks in the operating space, and the computer system is configured to obtain arm coordinates in an arm space when the robotic arm contacts the positioning marks,
• wherein the computer system is further configured to generate at least one conversion model among the image space, the operating space, and the arm space according to the image coordinates and the arm coordinates.