A position detection system that enables real-time detection of exact coordinates of the location to be operated in the human body in surgical fields comprising: - a cable containing optical Bragg fibers of which the reflectivity changes depending on the displacement and configured to connect to a surgical device and to be fixed with the tissue and/or the body forms to define a fiber Bragg reference coordinate system so that the reference coordinate system moves together with the tissue and/or the body form where the surgical operation will be performed; - a fiber Bragg grating device configured to determine the position and the orientation of the tip of the surgical device which the Bragg fibers cable are connected to; - a display device; - a computer having a user interface; wherein the computer is configured to: * obtain data from the surgical fields by Computerized Tomography (CT), MRI and/or any other imaging method ; * receive the position and the orientation of the tip of the surgical device which the Bragg fibers cable is connected to; * map said data with said position and orientation of the tip of the surgical device by using said interface with a software that runs on the computer by using landmarks ; * determine in real-time the location of any point in the operated region, which is mapped with said data, relative to the fiber Bragg reference coordinate system ; * transfer said location continuously and in real-time to said display device to show said data and said location in two and/or three-dimensions;such that the position and/or the orientation of the tip of the surgical device will not be affected by the positional changes of the operated region in case the fiber Bragg reference coordinate system is fixed with the tissue and/or the body forms and connected to move together. - a cable containing optical Bragg fibers of which the reflectivity changes depending on the displacement and configured to connect to a surgical device and to be fixed with the tissue and/or the body forms to define a fiber Bragg reference coordinate system so that the reference coordinate system moves together with the tissue and/or the body form where the surgical operation will be performed; - a fiber Bragg grating device configured to determine the position and the orientation of the tip of the surgical device which the Bragg fibers cable are connected to; - a display device; - a computer having a user interface; * obtain data from the surgical fields by Computerized Tomography (CT), MRI and/or any other imaging method ; * receive the position and the orientation of the tip of the surgical device which the Bragg fibers cable is connected to; * map said data with said position and orientation of the tip of the surgical device by using said interface with a software that runs on the computer by using landmarks ; * determine in real-time the location of any point in the operated region, which is mapped with said data, relative to the fiber Bragg reference coordinate system ; * transfer said location continuously and in real-time to said display device to show said data and said location in two and/or three-dimensions;such that the position and/or the orientation of the tip of the surgical device will not be affected by the positional changes of the operated region in case the fiber Bragg reference coordinate system is fixed with the tissue and/or the body forms and connected to move together. <EOS>