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�������պ����ѧѧ�� 2006, Vol. 32 Issue (12) :1477-1480    DOI:
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��ߴ繹����ҵCT���񷽷�
���, ����, ����, ����*
1. �������պ����ѧ ��е���̼��Զ���ѧԺ, ���� 100083;
2. ������ѧ ��ѧ��ѧѧԺ, ���� 100871
Industrial CT imaging method for large objects
Wei Dongbo, Fu Jian, Gong Lei, Jiang Ming*
1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. School of Mathematical Sciences, Peking University, Beijing 100871, China

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ժҪ Ϊ�����ߴ繹������ICT(Industrial Computed Tomography)��������,�����һ��ͨ����̨2��ƫ������ɨ���ӳ���ICT���񷽷�,����������ICTͶӰ���ݴ��ڵ���������,�Ƶ�������ͶӰ��������Ԥ���������˲���ͶӰ(FBP,Filter Back-Projection)�ؽ��㷨.������Ԥ����������������ͶӰ������ƽ����ͶӰ���ݼ�ĺ���ӳ���ϵ,�ɽ�̽������2��ɨ��λ�òɼ���2�鲻������������ͶӰ�������ų�һ��������ƽ������ͶӰ,�Ӷ�ʹ�����ؽ����Խ���.���������������,�÷������ع���ߴ繹��ͼ��ʱ,��������������.��������,������һ��360°��תɨ�������,����Чɨ����Ұ�ﵽ��׼����ICT������2.8������.�÷�������CTɨ��̨�߱�ƽ�ƺ���ת���ɶ�,��������������ICT����,����ʵ�ַ���.
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Abstract�� An industrial computed tomography(ICT) imaging method to enlarge the field of view was proposed to execute the rapid CT test of large objects. Its projection data rebin pre-processing method and filter back-projection reconstruction algorithm were deduced. The pre-processing method is from the fact that there exists the data redundancy for 3rd scan ICT. It creates the function mapping relationship between fan beam projections and parallel beam projections. This method can rebin the two groups of incomplete fan beam projections acquired by the detector at two positions into one group of complete parallel beam projections to meet the requirement of the reconstruction algorithm. The computer simulation results prove the validity of the proposed method to large objects. Analysis shows that its field of view is 1.8 times larger than that of 3rd scan ICT. This method can be implemented with the table with the transverse movement and the rotation movement and is easy to compatible with 3rd scan ICT without extra hardware requirements.
Keywords�� ICT   scan   filter back-projection   fan beam   large objects     
Received 2006-03-29;
Fund:

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About author: ���(1952-),��,���������,������, weidongbo1019@yahoo.com.cn.
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κ����, ����, ����, ����.��ߴ繹����ҵCT���񷽷�[J]  �������պ����ѧѧ��, 2006,V32(12): 1477-1480
Wei Dongbo, Fu Jian, Gong Lei, Jiang Ming.Industrial CT imaging method for large objects[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(12): 1477-1480
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