Publication detail

Voxel Size Calibration for High-resolution CT

Marek Zemek, Pavel Blažek, Jan Šrámek, Jakub Šalplachta, Tomáš Zikmund, Petr Klapetek, Yoshihiro Takeda, Kazuhiko Omote, Jozef Kaiser

Original Title

Voxel Size Calibration for High-resolution CT

Type

lecture

Language

English

Original Abstract

In cone-beam X-ray computed tomography (CT), distances between the source, object, and detector influence the visual fidelityand voxel size of a reconstructed volume. Calibration using reference objects is an appropriate tool for preventing errors in theestimates of these distances. There is, however, a lack of such objects for high-resolution systems with a small field of view(FoV). In this work, we propose a method to measure the distances mentioned above, improving the determination of voxel size.We use a custom reference object suitable for a FoV of around one millimeter. Many approaches have been developed for thiscalibration task and discussed in the literature, but none apply to CT scanners with a small FoV and a cone-beam magnificationclose to one. The proposed method thus aims to provide a calibration procedure for such devices. A Rigaku Nano3DX CTscanner has been calibrated through this method and used for practical validation of the method’s accuracy. Results have shownthat this approach allows for accurate calibration, which leads to improvements in reconstruction quality and accuracy of voxelsize determination.

Keywords

voxel size, calibration, nano-CT

Authors

Marek Zemek, Pavel Blažek, Jan Šrámek, Jakub Šalplachta, Tomáš Zikmund, Petr Klapetek, Yoshihiro Takeda, Kazuhiko Omote, Jozef Kaiser

Released

5. 2. 2020

Location

Wels

BibTex

@misc{BUT162260,
  author="Marek {Zemek} and Pavel {Blažek} and Jan {Šrámek} and Jakub {Šalplachta} and Tomáš {Zikmund} and Petr {Klapetek} and Jozef {Kaiser}",
  title="Voxel Size Calibration for High-resolution CT",
  year="2020",
  address="Wels",
  note="lecture"
}