Universität zu Köln

Neuhaus, Victor, Hokamp, Nils Grosse, Abdullayev, Nuran ORCID: 0000-0003-4522-537X, Rau, Robert, Mpotsaris, Anastasios ORCID: 0000-0002-1275-8164, Maintz, David and Borggrefe, Jan ORCID: 0000-0003-2908-7560 (2017). Metal artifact reduction by dual-layer computed tomography using virtual monoenergetic images. Eur. J. Radiol., 93. S. 143 - 149. CLARE: ELSEVIER IRELAND LTD. ISSN 1872-7727

Full text not available from this repository.

Abstract

Objective: The aim of the study was to investigate the performance and diagnostic value of metal artifact reduction in virtual monoenergetic images generated from dual-layer computed tomography (DLCT). Methods: 35 patients that received a DLCT at the University Hospital Cologne and had an orthopedic implant in the examined region were included in this study. For each DLCT virtual monoenergetic images of different energy levels (64 keV, 70 keV, 105 keV, 140 keV, 200 keV and an optimized photon energy) were reconstructed and analyzed by three blinded observers. Images were analyzed with regard to subjective criteria (extent of artifacts, diagnostic image quality) and objective criteria (width and density of artifacts). Results: 21 patients had implants in the spine, 8 in the pelvis and 6 patients in the extremities. Diagnostic image quality improved significantly at high photon energies from a Likert-score of 4.3 (+/- 0.83) to 2.3 (+/- 1.02) and artifacts decreased significantly from a score of 4.3 (+/- 0.66) to 2.6 (+/- 2.57). The average optimized photon energy was 149.2 +/- 39.4 keV. The density as well as the width of the most pronounced artifacts decreased from-374.6 +/- 251.89 HU to -12.5 +/- 205.84 HU and from 14.5 +/- 8.74 mm to 6.4 +/- 10.76 mm, respectively. Conclusion: Using virtual monoenergetic images valuable improvements of diagnostic image quality can be achieved by reduction of artifacts associated with metal implants. As preset for virtual monoenergetic images, 140 keV appear to provide optimal artifact reduction. In 20% of the patients, individually optimized keV can lead to a further improvement of image quality compared to 140 keV.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Neuhaus, Victor UNSPECIFIED UNSPECIFIED UNSPECIFIED Hokamp, Nils Grosse UNSPECIFIED UNSPECIFIED UNSPECIFIED Abdullayev, Nuran UNSPECIFIED orcid.org/0000-0003-4522-537X UNSPECIFIED Rau, Robert UNSPECIFIED UNSPECIFIED UNSPECIFIED Mpotsaris, Anastasios UNSPECIFIED orcid.org/0000-0002-1275-8164 UNSPECIFIED Maintz, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Borggrefe, Jan UNSPECIFIED orcid.org/0000-0003-2908-7560 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-224027
DOI:	10.1016/j.ejrad.2017.05.013
Journal or Publication Title:	Eur. J. Radiol.
Volume:	93
Page Range:	S. 143 - 149
Date:	2017
Publisher:	ELSEVIER IRELAND LTD
Place of Publication:	CLARE
ISSN:	1872-7727
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ENERGY CT; MATERIAL DECOMPOSITION; IMPLANTS; HARDWARE; SPINE Multiple languages Radiology, Nuclear Medicine & Medical Imaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22402