Monoenergetic computed tomography reconstructions reduce beam hardening artifacts from dental restorations

Stolzmann, Paul; Winklhofer, Sebastian; Schwendener, Nicole; Alkadhi, Hatem; Thali, Michael J.; Ruder, Thomas D. (2013). Monoenergetic computed tomography reconstructions reduce beam hardening artifacts from dental restorations. Forensic science, medicine and pathology, 9(3), pp. 327-332. Springer US; http://www.springer-ny.com 10.1007/s12024-013-9420-z

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The aim of this study was to assess the potential of monoenergetic computed tomography (CT) images to reduce beam hardening artifacts in comparison to standard CT images of dental restoration on dental post-mortem CT (PMCT). Thirty human decedents (15 male, 58 ± 22 years) with dental restorations were examined using standard single-energy CT (SECT) and dual-energy CT (DECT). DECT data were used to generate monoenergetic CT images, reflecting the X-ray attenuation at energy levels of 64, 69, 88 keV, and at an individually adjusted optimal energy level called OPTkeV. Artifact reduction and image quality of SECT and monoenergetic CT were assessed objectively and subjectively by two blinded readers. Subjectively, beam artifacts decreased visibly in 28/30 cases after monoenergetic CT reconstruction. Inter- and intra-reader agreement was good (k = 0.72, and k = 0.73 respectively). Beam hardening artifacts decreased significantly with increasing monoenergies (repeated-measures ANOVA p < 0.001). Artifact reduction was greatest on monoenergetic CT images at OPTkeV. Mean OPTkeV was 108 ± 17 keV. OPTkeV yielded the lowest difference between CT numbers of streak artifacts and reference tissues (-163 HU). Monoenergetic CT reconstructions significantly reduce beam hardening artifacts from dental restorations and improve image quality of post-mortem dental CT.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute of Legal Medicine > Forensic Medicine
04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology

UniBE Contributor:

Schwendener, Nicole and Ruder, Thomas

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1547-769X

Publisher:

Springer US; http://www.springer-ny.com

Language:

English

Submitter:

Aisha Stefania Mzinga

Date Deposited:

13 May 2014 09:37

Last Modified:

24 Oct 2019 05:54

Publisher DOI:

10.1007/s12024-013-9420-z

PubMed ID:

23512303

BORIS DOI:

10.7892/boris.52351

URI:

https://boris.unibe.ch/id/eprint/52351

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