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Sensors 2015, 15(9), 22811-22825; doi:10.3390/s150922811

Geometric Parameters Estimation and Calibration in Cone-Beam Micro-CT

State Key Laboratory of Precision Measuring Technology and Instrument, Tianjin University, Tianjin 300072, China
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Academic Editor: Vittorio M. N. Passaro
Received: 17 July 2015 / Revised: 2 September 2015 / Accepted: 2 September 2015 / Published: 9 September 2015
(This article belongs to the Section Physical Sensors)
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Abstract

The quality of Computed Tomography (CT) images crucially depends on the precise knowledge of the scanner geometry. Therefore, it is necessary to estimate and calibrate the misalignments before image acquisition. In this paper, a Two-Piece-Ball (TPB) phantom is used to estimate a set of parameters that describe the geometry of a cone-beam CT system. Only multiple projections of the TPB phantom at one position are required, which can avoid the rotation errors when acquiring multi-angle projections. Also, a corresponding algorithm is derived. The performance of the method is evaluated through simulation and experimental data. The results demonstrated that the proposed method is valid and easy to implement. Furthermore, the experimental results from the Micro-CT system demonstrate the ability to reduce artifacts and improve image quality through geometric parameter calibration. View Full-Text
Keywords: computed tomography; misalignment; geometric parameters estimation; calibration computed tomography; misalignment; geometric parameters estimation; calibration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhao, J.; Hu, X.; Zou, J.; Hu, X. Geometric Parameters Estimation and Calibration in Cone-Beam Micro-CT. Sensors 2015, 15, 22811-22825.

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