Automatic calibration method of voxel size for cone-beam 3D-CT scanning system

YANG Min; WANG Xiao-Long; LIU Yi-Peng; MENG Fan-Yong; LI Xing-Dong; LIU Wen-Li; WEI Dong-Bo

doi:10.1088/1674-1137/38/4/046202

Chinese Physics C> 2014, Vol. 38> Issue(4) : 046202 DOI: 10.1088/1674-1137/38/4/046202

Automatic calibration method of voxel size for cone-beam 3D-CT scanning system

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Abstract：
For a cone-beam three-dimensional computed tomography (3D-CT) scanning system, voxel size is an important indicator to guarantee the accuracy of data analysis and feature measurement based on 3D-CT images. Meanwhile, the voxel size changes with the movement of the rotary stage along X-ray direction. In order to realize the automatic calibration of the voxel size, a new and easily-implemented method is proposed. According to this method, several projections of a spherical phantom are captured at different imaging positions and the corresponding voxel size values are calculated by non-linear least-square fitting. Through these interpolation values, a linear equation is obtained that reflects the relationship between the voxel size and the rotary stage translation distance from its nominal zero position. Finally, the linear equation is imported into the calibration module of the 3D-CT scanning system. When the rotary stage is moving along X-ray direction, the accurate value of the voxel size is dynamically exported. The experimental results prove that this method meets the requirements of the actual CT scanning system, and has virtues of easy implementation and high accuracy.

References

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YANG Min, WANG Xiao-Long, LIU Yi-Peng, MENG Fan-Yong, LI Xing-Dong, LIU Wen-Li and WEI Dong-Bo. Automatic calibration method of voxel size for cone-beam 3D-CT scanning system[J]. Chinese Physics C, 2014, 38(4): 046202. doi: 10.1088/1674-1137/38/4/046202

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Received: 2013-05-08
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Automatic calibration method of voxel size for cone-beam 3D-CT scanning system

Received Date: 2013-05-08

Accepted Date: 1900-01-01

Available Online: 2014-04-05

Abstract: For a cone-beam three-dimensional computed tomography (3D-CT) scanning system, voxel size is an important indicator to guarantee the accuracy of data analysis and feature measurement based on 3D-CT images. Meanwhile, the voxel size changes with the movement of the rotary stage along X-ray direction. In order to realize the automatic calibration of the voxel size, a new and easily-implemented method is proposed. According to this method, several projections of a spherical phantom are captured at different imaging positions and the corresponding voxel size values are calculated by non-linear least-square fitting. Through these interpolation values, a linear equation is obtained that reflects the relationship between the voxel size and the rotary stage translation distance from its nominal zero position. Finally, the linear equation is imported into the calibration module of the 3D-CT scanning system. When the rotary stage is moving along X-ray direction, the accurate value of the voxel size is dynamically exported. The experimental results prove that this method meets the requirements of the actual CT scanning system, and has virtues of easy implementation and high accuracy.

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Automatic calibration method of voxel size for cone-beam 3D-CT scanning system

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