Universität zu Köln

Laukamp, Kai Roman, Hokamp, Nils Grosse, Alabar, Omar, Obmann, Verena Carola, Lennartz, Simon, Zopfs, David ORCID: 0000-0001-9978-7453, Gilkeson, Robert, Ramaiya, Nikhil and Gupta, Amit (2020). Metal artifacts from sternal wires: evaluation of virtual monoenergetic images from spectral-detector CT for artifact reduction. Clin. Imaging, 60 (2). S. 249 - 257. NEW YORK: ELSEVIER SCIENCE INC. ISSN 1873-4499

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Abstract

Purpose: In chest imaging, sternal wires can cause metal artifacts that hamper depiction of surrounding soft tissue and bone. This study investigated if these artifacts may be reduced by means of virtual monoenergetic images (VMD obtained from a novel detector-based spectral CT scanner (SDCT) in comparison to conventional CT images (CI). Materials and methods: 30 patients with clinically indicated SDCT scans of the chest exhibiting artifacts due to sternal wires were included in this IRB-approved study. CI and VMI (40-200 keV, 10 keV increment) were reconstructed. Quantitative image analysis was conducted by ROI-based measurement of attenuation (HU) and standard deviation within the most pronounced hypo- and hyperdense artifacts. Visually, artifact reduction and diagnostic assessment of surrounding soft tissue as well as sternal bone were independently rated by two radiologists on 5-point Likert-scales. Results: In comparison to CI, high-keV VMI showed an effective reduction of hypo- and hyperattenuating parasternal artifacts, as corrected HU-values approximated their true expected values (hypodense: CI -66.2 +/- 70.8; VMI200keV 2.4 +/- 29.2; hyperdense: CI 156.7 +/- 70.8HU; VMI200keV 76.9 +/- 45.4, both p < 0.05). In addition, image noise was significantly lower in high-keV VMI compared to Cl. Subjective analysis confirmed that VMI of 100 keV significantly reduced artifacts and improved diagnostic assessment of surrounding soft tissue and bone. Interrater-agreement was excellent (intraclass-correlation-coefficient = 0.83). Conclusions: High-keV VMI yielded a significant reduction of artifacts from sternal wires and improved assessment of surrounding structures.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Laukamp, Kai Roman UNSPECIFIED UNSPECIFIED UNSPECIFIED Hokamp, Nils Grosse UNSPECIFIED UNSPECIFIED UNSPECIFIED Alabar, Omar UNSPECIFIED UNSPECIFIED UNSPECIFIED Obmann, Verena Carola UNSPECIFIED UNSPECIFIED UNSPECIFIED Lennartz, Simon UNSPECIFIED UNSPECIFIED UNSPECIFIED Zopfs, David UNSPECIFIED orcid.org/0000-0001-9978-7453 UNSPECIFIED Gilkeson, Robert UNSPECIFIED UNSPECIFIED UNSPECIFIED Ramaiya, Nikhil UNSPECIFIED UNSPECIFIED UNSPECIFIED Gupta, Amit UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-339579
DOI:	10.1016/j.clinimag.2019.12.018
Journal or Publication Title:	Clin. Imaging
Volume:	60
Number:	2
Page Range:	S. 249 - 257
Date:	2020
Publisher:	ELSEVIER SCIENCE INC
Place of Publication:	NEW YORK
ISSN:	1873-4499
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DUAL-ENERGY CT; COMPUTED-TOMOGRAPHY; ORTHOPEDIC HARDWARE; RECONSTRUCTION; EXTRAPOLATION; SOFTWARE; IMPLANTS; SPINE Multiple languages Radiology, Nuclear Medicine & Medical Imaging Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33957