Universität zu Köln

Laukamp, Kai Roman, Lennartz, Simon, Neuhaus, Victor-Frederic, Hokamp, Nils Grosse, Rau, Robert, Le Blanc, Markus, Abdullayev, Nuran ORCID: 0000-0003-4522-537X, Mpotsaris, Anastasios ORCID: 0000-0002-1275-8164, Maintz, David and Borggrefe, Jan ORCID: 0000-0003-2908-7560 (2018). CT metal artifacts in patients with total hip replacements: for artifact reduction monoenergetic reconstructions and post-processing algorithms are both efficient but not similar. Eur. Radiol., 28 (11). S. 4524 - 4534. NEW YORK: SPRINGER. ISSN 1432-1084

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Abstract

Objectives This study compares metal artifact (MA) reduction in imaging of total hip replacements (THR) using virtual monoenergetic images (VMI), for MA-reduction-specialized reconstructions (MAR) and conventional CT images (CI) from detector-based dual-energy computed tomography (SDCT). Methods Twenty-seven SDCT-datasets of patients carrying THR were included. CI, MAR and VMI with different energy-levels (60-200 keV) were reconstructed from the same scans. MA width was measured. Attenuation (HU), noise (SD) and contrast-to-noise ratio (CNR) were determined in: extinction artifact, adjacent bone, muscle and bladder. Two radiologists assessed MA-reduction and image quality visually. Results In comparison to CI, VMI (200 keV) and MAR showed a strong artifact reduction (MA width: CI 29.9 +/- 6.8 mm, VMI 17.6 +/- 13.6 mm, p<0.001; MAR 16.51 +/- 4.9 mm, p<0.001; MA density: CI -412.1 +/- 204.5 HU, VMI -279.7 +/- 283.7 HU; p<0.01; MAR -116.74 +/- 105.6 HU, p<0.001). In strong artifacts reduction was superior by MAR. In moderate artifacts VMI was more effective. MAR showed best noise reduction and CNR in bladder and muscle (p<0.05), whereas VMI were superior for depiction of bone (p<0.05). Visual assessment confirmed that VMI and MAR improve artifact reduction and image quality (p<0.001). Conclusions MAR and VMI (200 keV) yielded significant MA reduction. Each showed distinct advantages both regarding effectiveness of artifact reduction, MAR regarding assessment of soft tissue and VMI regarding assessment of bone.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Laukamp, Kai Roman UNSPECIFIED UNSPECIFIED UNSPECIFIED Lennartz, Simon UNSPECIFIED UNSPECIFIED UNSPECIFIED Neuhaus, Victor-Frederic UNSPECIFIED UNSPECIFIED UNSPECIFIED Hokamp, Nils Grosse UNSPECIFIED UNSPECIFIED UNSPECIFIED Rau, Robert UNSPECIFIED UNSPECIFIED UNSPECIFIED Le Blanc, Markus UNSPECIFIED UNSPECIFIED UNSPECIFIED Abdullayev, Nuran UNSPECIFIED orcid.org/0000-0003-4522-537X 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:38-166854
DOI:	10.1007/s00330-018-5414-2
Journal or Publication Title:	Eur. Radiol.
Volume:	28
Number:	11
Page Range:	S. 4524 - 4534
Date:	2018
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1432-1084
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COMPUTED-TOMOGRAPHY; ORTHOPEDIC IMPLANTS; DECT Multiple languages Radiology, Nuclear Medicine & Medical Imaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16685