Influence of data completion on scatter artifact correction for truncated cone-beam CT data

Nadine Waltrich; Stefan Sawall; Joscha Maier; Jan Kuntz; Kai Stannigel; Kai Lindenberg; Marc Kachelrieß

doi:10.1117/12.2292198

9 March 2018 Influence of data completion on scatter artifact correction for truncated cone-beam CT data

Nadine Waltrich, Stefan Sawall, Joscha Maier, Jan Kuntz, Kai Stannigel, Kai Lindenberg, Marc Kachelrieß

Proceedings Volume 10573, Medical Imaging 2018: Physics of Medical Imaging; 1057349 (2018) https://doi.org/10.1117/12.2292198
Event: SPIE Medical Imaging, 2018, Houston, Texas, United States

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.

Citation Download Citation

Nadine Waltrich, Stefan Sawall, Joscha Maier, Jan Kuntz, Kai Stannigel, Kai Lindenberg, and Marc Kachelrieß "Influence of data completion on scatter artifact correction for truncated cone-beam CT data", Proc. SPIE 10573, Medical Imaging 2018: Physics of Medical Imaging, 1057349 (9 March 2018); https://doi.org/10.1117/12.2292198

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