Universität zu Köln

Hokamp, Nils Grosse, Neuhaus, V., Abdullayev, N., Laukamp, K., Lennartz, S., Mpotsaris, A. and Borggrefe, J. (2018). Reduction of artifacts caused by orthopedic hardware in the spine in spectral detector CT examinations using virtual monoenergetic image reconstructions and metal-artifact-reduction algorithms. Skeletal Radiol., 47 (2). S. 195 - 202. NEW YORK: SPRINGER. ISSN 1432-2161

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Abstract

Aim of this study was to assess the artifact reduction in patients with orthopedic hardware in the spine as provided by (1) metal-artifact-reduction algorithms (O-MAR) and (2) virtual monoenergetic images (MonoE) as provided by spectral detector CT (SDCT) compared to conventional iterative reconstruction (CI). In all, 28 consecutive patients with orthopedic hardware in the spine who underwent SDCT-examinations were included. CI, O-MAR and MonoE (40-200 keV) images were reconstructed. Attenuation (HU) and noise (SD) were measured in order to calculate signal-to-noise ratio (SNR) of paravertebral muscle and spinal canal. Subjective image quality was assessed by two radiologists in terms of image quality and extent of artifact reduction. O-MAR and high-keV MonoE showed significant decrease of hypodense artifacts in terms of higher attenuation as compared to CI (CI vs O-MAR, 200 keV MonoE: -396.5HU vs. -115.2HU, -48.1HU; both p 0.001). Further, artifacts as depicted by noise were reduced in O-MAR and high-keV MonoE as compared to CI in (1) paravertebral muscle and (2) spinal canal-CI vs. O-MAR/200 keV: (1) 34.7 +/- 19.0 HU vs. 26.4 +/- 14.4 HU, p 0.05/27.4 +/- 16.1, n.s.; (2) 103.4 +/- 61.3 HU vs. 72.6 +/- 62.6 HU/60.9 +/- 40.1 HU, both p 0.001. Subjectively both O-MAR and high-keV images yielded an artifact reduction in up to 24/28 patients. Both, O-MAR and high-keV MonoE reconstructions as provided by SDCT lead to objective and subjective artifact reduction, thus the combination of O-MAR and MonoE seems promising for further reduction.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hokamp, Nils Grosse UNSPECIFIED UNSPECIFIED UNSPECIFIED Neuhaus, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Abdullayev, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Laukamp, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lennartz, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mpotsaris, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Borggrefe, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-196719
DOI:	10.1007/s00256-017-2776-5
Journal or Publication Title:	Skeletal Radiol.
Volume:	47
Number:	2
Page Range:	S. 195 - 202
Date:	2018
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1432-2161
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DUAL-ENERGY CT; COMPUTED-TOMOGRAPHY; MULTICHANNEL CT; EXTRAPOLATION; ANGIOGRAPHY; IMPLANTS; PHYSICS Multiple languages Orthopedics; Radiology, Nuclear Medicine & Medical Imaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19671