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Proceedings Paper

Measurement of center of rotation for projection in x-ray two-dimensional computed tomography system
Author(s): Baolei Li; Yaojun Zhang; Yang Mo
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Paper Abstract

The determination of the center of rotation for projection is a very important step for the establishment of a X-ray two-dimensional computed tomography imaging system. The error of the center of rotation may lead to artifact in computed tomography image. In this work, the current popular measurement methods for the center of rotation are described and their advantages and disadvantages are reviewed, and a new method is thus put forward through analysis. The proposed algorithm is based on the laws: 'A particle is scanned a circle by computed tomography scanner, then the integral of the particle's projection address under each projection view equals to zero' and 'The sum of the coordinates of crossing points of projection sine curves of two random particles equals to zero'. The center of rotation for projection is determined by calculating the mean of projection address of the X-ray beam penetrating object. Compared with the current methods, the proposed algorithm needs no phantom and geometry parameter. The algorithm is real-time and has high measurement precision. The feasibility of the method is validated using the experiment results.

Paper Details

Date Published: 31 December 2010
PDF: 8 pages
Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 75445O (31 December 2010); doi: 10.1117/12.885217
Show Author Affiliations
Baolei Li, The First Research Institute of Ministry of Public Security (China)
Peking Univ. (China)
Yaojun Zhang, The First Research Institute of Ministry of Public Security (China)
Yang Mo, The First Research Institute of Ministry of Public Security (China)


Published in SPIE Proceedings Vol. 7544:
Sixth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Xianfang Wen, Editor(s)

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