High-Dynamic-Range CT Reconstruction Based on Varying Tube-Voltage Imaging.

Ping Chen,Jinxiao Pan,Yan Han,Gui-Quan Sun

doi:10.1371/journal.pone.0141789

Ping Chen, Jinxiao Pan + Show 2 more

Open Access

https://doi.org/10.1371/journal.pone.0141789

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Journal: PloS one	Publication Date: Nov 6, 2015
Citations: 15	License type: CC BY 4.0

Affiliation: North University of China, University North

Abstract

For complicated structural components characterized by wide X-ray attenuation ranges, the conventional computed tomography (CT) imaging using a single tube-voltage at each rotation angle cannot obtain all structural information. This limitation results in a shortage of CT information, because the effective thickness of the components along the direction of X-ray penetration exceeds the limitation of the dynamic range of the X-ray imaging system. To address this problem, high-dynamic-range CT (HDR-CT) reconstruction is proposed. For this new method, the tube’s voltage is adjusted several times to match the corresponding effective thickness about the local information from an object. Then, HDR fusion and HDR-CT are applied to obtain the full reconstruction information. An accompanying experiment demonstrates that this new technology can extend the dynamic range of X-ray imaging systems and provide the complete internal structures of complicated structural components.

Highlights

Computed tomography (CT) can be used in industrial nondestructive testing[1,2]
We fuse the projection sequences with different voltage at the every projection angle to get the high-dynamic-range (HDR) projection, because one tube voltage is corresponding to the certain attenuation thickness, which is showed in the local effective area of projection
For an object that spans a broad range of X-ray attenuation, conventional fixed tube-voltage CT imaging cannot obtain all of its structural information, because of the mismatch among the X-ray energy, thickness and dynamic range of the imaging system

Summary

Introduction

In the X-ray imaging system, under the limitation of dynamic range, the conventional single tube-voltage imaging method cannot capture all of the structure information for the complicated structural components. Some researchers use fusion algorithm to extend the dynamic range of detector based on multi-exposure image sequences with the different ray energy.

Results

Conclusion