A geometric calibration method for cone beam CT systems

Kai Yang; Alexander L. C. Kwan; DeWitt F. Miller; John M. Boone

doi:10.1118/1.2198187

A geometric calibration method for cone beam CT systems

Medical Physics ◽

10.1118/1.2198187 ◽

2006 ◽

Vol 33 (6Part1) ◽

pp. 1695-1706 ◽

Cited By ~ 128

Author(s):

Kai Yang ◽

Alexander L. C. Kwan ◽

DeWitt F. Miller ◽

John M. Boone

Keyword(s):

Cone Beam Ct ◽

Calibration Method ◽

Cone Beam ◽

Geometric Calibration

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A geometric calibration approach for industrial cone-beam CT system based on low-rank phantom

Measurement Science and Technology ◽

10.1088/1361-6501/ac38ef ◽

2021 ◽

Author(s):

Jianqiao Yu ◽

Jian Lu ◽

Yi Sun ◽

Jishun Liu ◽

Kai Cheng

Keyword(s):

Cone Beam Ct ◽

Calibration Method ◽

Low Rank ◽

Cone Beam ◽

Ball Bearings ◽

Geometric Calibration ◽

System A ◽

Ct System ◽

Local Image ◽

Calibration Approach

Abstract Precise alignment of the system scan geometry is crucial to ensure the reconstructed image quality in the cone-beam CT system. A calibration method that depends on the local feature of ball bearings phantom and point-like markers is probably affected by local image variations. Besides, multiple projections with circular scanning are usually required by this type of method to derive misaligned parameters. In contrast to previous works, this paper proposes a method that depends on the global symmetric low-rank feature of a novel phantom, which can accurately represent the system geometrical misalignment. All the misaligned parameters of the cone-beam CT system can be estimated from a single perspective direction without circular scanning. Meanwhile, since the global low-rank feature of the phantom is utilized, the proposed method is robust to the noise. Extensive simulations and real experiments validate the accuracy and robustness of our method, which achieves better performance compared to an existing phantom-based method.

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A Practical Geometric Calibration Method of Cone-Beam CT System Using Simple Handmade Phantom

Journal of Medical Imaging and Health Informatics ◽

10.1166/jmihi.2015.1669 ◽

2015 ◽

Vol 5 (8) ◽

pp. 1915-1920

Author(s):

S. Y. Wu ◽

H. W. Li ◽

H. L. Qi ◽

Y. B. Luo ◽

X. Zhen ◽

...

Keyword(s):

Cone Beam Ct ◽

Calibration Method ◽

Cone Beam ◽

Geometric Calibration ◽

Ct System

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Geometric Calibration Based on a Simple Phantom for Multi-Lens Microscopic CT

International Journal of Computational Methods ◽

10.1142/s021987621842015x ◽

2019 ◽

Vol 16 (03) ◽

pp. 1842015 ◽

Cited By ~ 3

Author(s):

Shouhua Luo ◽

Haitao Xu ◽

Liang Zheng ◽

Guang Li ◽

Xiaobing Zhang ◽

...

Keyword(s):

Cost Function ◽

Cone Beam Ct ◽

Calibration Method ◽

Cone Beam ◽

Objective Lens ◽

Geometrical Parameters ◽

Geometric Calibration ◽

Beam System ◽

Ct System ◽

The Cost

In multi-lens microscopic cone-beam CT system, different resolutions can be achieved by tuning different objective lens with different magnifications, following the scan field of view (FOV) changed. By this multi-FOV/resolution acquisition strategy, many applications like truncation problem can be solved successfully. However, in order to achieve high-resolution image, the microscopic cone-beam CT system should comply with its geometrical restrictions accordingly, which are not only for that of conventional cone-beam system but also for that of multiple objective lens. Hence, compared with the existed cone-beam system calibration, a specific united calibration method is proposed in this paper. A set of geometrical parameters is presented, which can fully describe whole geometry of conventional cone-beam system as well as multi-lens. By taking use of projective data of circular trajectory of one single ball phantom, a cost function with the described arguments based on the projective lines of the phantom is built up. After solving the cost function, the calibration parameters can be determined optimally. The simulated and experimental results demonstrate that the proposed method shows significant improvements in robustness, precision and implementation.

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