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Proceedings Paper

Influence of data completion on scatter artifact correction for truncated cone-beam CT data
Author(s): Nadine Waltrich; Stefan Sawall; Joscha Maier; Jan Kuntz; Kai Stannigel; Kai Lindenberg; Marc Kachelrieß
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Paper Abstract

X-ray scatter leads to one of the major artifacts limiting the image quality in cone-beam CT (CBCT). Hence the interest to perform an accurate scatter correction is very high. A particularly large amount of scatter is created in CBCT, due to the large cone-angle and the small distance between the rotation axis and the detector. Even if an anti-scatter grid is used, a scatter correction is necessary. The performance of an accurate scatter correction is difficult, especially when the data are additionally truncated due to a small field of measurement (FOM) (e.g. dental CT systems or C-Arm CT systems). In addition to the image degradation due to scatter artifacts, numerous CBCT artifacts like beam-hardening artifacts and cone-beam artifacts contribute to a further reduction in image quality. In this paper different detruncation methods are compared with respect to scatter to find a quantitative scatter correction approach for truncated CBCT data. The evaluation shows that a precise detruncation is crucial for an appropriate scatter correction. Additionally, the general image quality limit is enhanced by performing further artifact correction methods to reconstruct a nearly artifact-free CBCT volume.

Paper Details

Date Published: 9 March 2018
PDF: 6 pages
Proc. SPIE 10573, Medical Imaging 2018: Physics of Medical Imaging, 1057349 (9 March 2018); doi: 10.1117/12.2292198
Show Author Affiliations
Nadine Waltrich, German Cancer Research Ctr. (DKFZ) (Germany)
Ruprecht-Karls-Univ. (Germany)
Stefan Sawall, German Cancer Research Ctr. (DKFZ) (Germany)
Ruprecht-Karls-Univ. (Germany)
Joscha Maier, German Cancer Research Ctr. (DKFZ) (Germany)
Ruprecht-Karls-Univ. (Germany)
Jan Kuntz, German Cancer Research Ctr. (DKFZ) (Germany)
Ruprecht-Karls-Univ. (Germany)
Kai Stannigel, Sirona Dental Systems GmbH (Germany)
Kai Lindenberg, Sirona Dental Systems GmbH (Germany)
Marc Kachelrieß, German Cancer Research Ctr. (DKFZ) (Germany)
Ruprecht-Karls-Univ. (Germany)


Published in SPIE Proceedings Vol. 10573:
Medical Imaging 2018: Physics of Medical Imaging
Joseph Y. Lo; Taly Gilat Schmidt; Guang-Hong Chen, Editor(s)

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