title: Feasibility evaluation of a motion detection system with face images for stereotactic radiosurgery.
abstract: In stereotactic radiosurgery we can irradiate a targeted volume precisely with a narrow high-energy x-ray beam, and thus the motion of a targeted area may cause side effects to normal organs. This paper describes our motion detection system with three USB cameras. To reduce the effect of change in illuminance in a tracking area we used an infrared light and USB cameras that were sensitive to the infrared light. The motion detection of a patient was performed by tracking his/her ears and nose with three USB cameras, where pattern matching between a predefined template image for each view and acquired images was done by an exhaustive search method with a general-purpose computing on a graphics processing unit (GPGPU). The results of the experiments showed that the measurement accuracy of our system was less than 0.7 mm, amounting to less than half of that of our previous system.
authors.affiliation: Department of Applied Informatics, Faculty of Science and Engineering, Hosei University, Kajinocho, Koganei, Tokyo 184-8584, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Yamakawa
authors.forename: Koichi
authors.initials: K
authors.lastname: Ogawa
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Iyatomi
authors.forename: Etsuo
authors.initials: E
authors.lastname: Kunieda
mesh_terms: D016477:Artifacts; D005145:Face / Q000033:anatomy & histology*; D005240:Feasibility Studies; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D009038:Motion; D016634:Radiosurgery / Q000379:methods*; D061089:Radiotherapy, Image-Guided / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013382:Subtraction Technique