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Study on Accuracy Improvement of Registration for Transcranial Magnetic Stimulation


Se-jong Ahn, Sung-wook Shin, Hyu-jeong Kim, Sung-taek Chung, Se-jin Yoon


Vol. 12  No. 2  pp. 20-26


Transcranial Magnetic Stimulation (TMS) is a noninvasive method using magnetic simulation and is being used for stroke patients or those with various cerebral diseases accompanying memory impairment, such as Parkinson’s disease and depression. This type of treatment is to stimulate the brain directly, and it is essential to apply correct stimulation to an anatomical position of a patient. For effective TMS, therefore, a navigation system is needed to provide information about a correct position for stimulation. This system shows the location and the direction of the stimulated position on the three-dimensional magnetic resonance imaging of a patient and applies magnetic stimulation to a correct location in consideration of anatomical features of individual patients. To apply such a navigation system, technology for tracing a relative coordinate of a transducer that generates a magnetic field is necessary to stimulate the brain and the head location of a patient. For the real-time tracing of the coordinate, therefore, this study used two cameras to draw a three-dimensional coordinate through view-difference algorithm of the cameras, analytical forward intersection, camera calibration, and information about internal elements of the cameras. A program was developed to show registration between information about the head location and posture of a patient through the three-dimensional coordinate and the three-dimensional model obtained from the magnetic resonance imaging data in real time.


Transcranial Magnetic Stimulation(TMS), Field of View(FOV), Navigation System, Registration, Camera Calibration