学位論文

定位放射線治療における動き検出システムのGPGPUによる高速化

Acceleration of motion detection system by GPGPU for stereotactic radiotherapy

jpn

2012-03-24

Not Applicable (or Unknown)

2012-03-24

修士(工学)

工学研究科情報電子工学専攻; 指導教授: 尾川浩一

Stereotactic radiosurgery is a non–invasive method for treatment of tumors with a narrow high–energy x-ray beam. In this therapy, a target region is intensively irradiated with the narrow beam, and thus any unexpected patient motion may lead to undesirable irradiation of neighboring normal tissues and organs. To overcome this problem, we propose a real-time contactless motion detection system with three USB cameras in stereotactic radiosurgery of the head and neck. Our system uses three images of the patient’s nose and ears acquired with these cameras, and it detects patient motion with a template-matching method. If a movement of the patient is detected, our system alerts the radiologist to turn the beam off. We reduced the　influence of a lighting variation that occurred in an irradiation room where USB cameras were used that were sensitive to the infrared light. To detect movement in acquired images, we used a template-matching method that was realized with a general purpose computing - on-graphics units. In this paper, we outline the proposed new motion detection system based on monitoring of images of a patient acquired with infrared USB cameras and a template-matching method. The performance of our system was evaluated under the same conditions as those used in actual radiation therapy of the head and neck.

Thesis