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Research on Precision Analysis&Calibration Method of the C Arm Angiography System

Author: WangYang
Tutor: ZhangTao
School: Graduate Schoo,Chinese Academy of Sciences
Course: Mechanical Engineering
Keywords: C arm Kinematics model Binocular vision Precision analysis Calibration
CLC: TP274
Type: Master's thesis
Year: 2012
Downloads: 19
Quote: 0
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Abstract


Real-time three-dimensional imaging system positioning accuracy is related to the imaging of lesions after high precision positioning. Based on this problem, in this paper, the C arm model has been studied. emphatically elaborated based on C arm space measuring system platform application.First of all. describes the space positioning system in C arm background on tracking performance can play an important role. this paper expounds the three dimensional measuring technology research present situation. proposed based on stereo vision application platform ideas, including the mathematical modeling and key technology to realize the goals.Secondly. this article expounds the detail of C arm kinematics modeling theory, combining C arm, the feature of structure and the movement rule. according to space coordinates transformation basic principle and matrix analysis method, the establishment of a description C arm the axis tie between the relative position and posture of the matrix equation, realized the C arm system mathematical modeling process.Again, gives the binocular vision3d measurement method of measuring principle, mathematical model, the basic composition of the system and the working procedure, and the camera linear model and distortion has conducted the analysis research.Then, this paper introduces the spatial measurement positioning system platform of the specific composition and in this system of camera calibration and three dimensional reconstruction experiments, and the two camera calibration parameters to solve mark dot in the center of the space distance, and the calibration board the distance between the target comparison, the reconstruction result value.At last, the research of binocular vision measuring system used in C arm, according to the actual demand of the system used to determine effective field and the measurement precision, get spatial measurement positioning system structure, establishing the system of precision analysis mathematical model, the simulation of MATLAB, simulate the corresponding measurement space range. The results show that the system precision meet the technical index requirements, for the subsequent expansion application research laid the important theoretical and experimental basis.

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