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�������պ����ѧѧ�� 2011, Vol. 37 Issue (4) :458-461    DOI:
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Method for measuring projection position of focal point based on space geometrical relations
Li Bin, Fu Jian, Zhou Zhenggan*
School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ Ϊ�����ƹ�ҵ�������������(CT,Computed Tomography)�����е��ؽ�αӰ,�о���һ�ֻ��ڿռ�������ι�ϵ������Դ����ͶӰλ�ò�������,������˼���������ʵ����֤.�÷������ݹ�ҵCTɨ��ϵͳ�ļ��νṹ��ϵ��������Դ����ͶӰλ�ú�ת̨��ת����ͶӰλ��֮��Ŀռ�������ʽ,Ȼ��ͨ������ת̨��ת�����ڶ��λ�õ�ͶӰ�������������Դ����ͶӰλ��.�÷���Ҫ��ת̨����3�����ɶ�:��ת,ƽ����̽���������ƶ�,�ʹ�ֱ��̽���������ƶ�.�����ʵ��������,�÷����ܹ���Ч�����ؽ�αӰ.�÷�������ʹ������ģ��,����Ҫ�κ����鼸�β���,�����з�����Ϊ����.
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Abstract�� In order to reduce artifacts on industrial computed tomography(CT) images, one method for measuring the projection position of the focal point based on space geometrical relations was put forward. Computer simulations and experiments were carried out. The method established analytic equations between the projection position of the focal point and the projection position of the center of rotation. The projection position of the focal point was calculated through several times calculation of the center of rotation in different places. The method required the turntable to have three freedoms: rotating, moving parallel to the detector and moving vertical to the detector. Computer simulations and experiments results demonstrate that this method is effective to reduce CT artifacts. Compared with the current methods, the proposed algorithm need not any special phantoms and need not any priori geometry parameters. It is more convenient for engineering.
Keywords�� computerized tomography   nondestructive examination   two dimensional   measurements   image quality   least squares approximations     
Received 2010-05-15;
Fund:

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About author: �� ��(1983-),��,������½��,��ʿ��,libin@me.buaa.edu.cn.
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���, ����, ������.���ڿռ�������ι�ϵ�Ľ���ͶӰλ�ò���[J]  �������պ����ѧѧ��, 2011,V37(4): 458-461
Li Bin, Fu Jian, Zhou Zhenggan .Method for measuring projection position of focal point based on space geometrical relations[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(4): 458-461
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