Wang D.-D.,China Metrologial University |
Wang D.-D.,Tianjin University |
Chen X.-X.,China Metrologial University |
Xu Y.-B.,China Metrologial University |
And 2 more authors.
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2014
The spatial mechanical structure deviation in cone-beam CT system could introduce false image and significantly influence the measurement results, and they are difficult to be completely removed from the measured data with the traditional calibration method. This paper presents a method for the measurement of angle parameters in cone-beam CT system due to structure deviations, which is based on space analytic geometry. With the single projection data of a calibration phantom, the measurement of angle parameters can be realized. Both the computer simulation and experimental measurement have been carried out to validate the feasibility and accuracy of the proposed method. The results show that the proposed method provides a feasible way to measure the angle parameters of cone-beam CT system, and the measurement precision can reach the order of minute in the experimental validation. Compared with the measurement results with plane analytic geometry method, it can be demonstrated that the proposed measurement method can separate angle parameters effectively. The proposed method for the measurement of angle parameters of cone-beam CT system has high reliability and measurement efficiency, and does not need multiple projections. It has great practicality for angle parameters measurement and calibration of cone-beam CT system.