Universität zu Köln

Laukamp, Kai Roman ORCID: 0000-0002-5600-5914, Zopfs, David ORCID: 0000-0001-9978-7453, Wagner, Anton, Lennartz, Simon, Pennig, Lenhard, Borggrefe, Jan ORCID: 0000-0003-2908-7560, Ramaiya, Nikhil and Hokamp, Nils Grosse (2019). CT artifacts from port systems: Virtual monoenergetic reconstructions from spectral-detector CT reduce artifacts and improve depiction of surrounding tissue. Eur. J. Radiol., 121. CLARE: ELSEVIER IRELAND LTD. ISSN 1872-7727

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Abstract

Purpose: CT artifacts from port-systems are a common problem in staging- and restaging-examinations and reduce image quality and diagnostic assessment. The purpose of this study was to investigate the reduction of these artifacts using virtual monoenergetic images (VMI) from dual-energy spectral-detector CT (SDCT) in comparison to conventional CT-images (CI). Method: 50 SDCT-datasets of patients with artifacts from port-chamber and port-catheters were included in this IRB-approved, retrospective study. CI and VMI (range, 40-200 keV, 10 keV increment) were reconstructed from the same acquisition. The quantitative image analysis was performed ROI-based assessing mean and standard deviation of attenuation (HU) in most pronounced hypo- and hyperdense artifacts surrounding to the portchamber and the distal end of the port-catheter in the superior vena cava. Subjectively, artifact reduction and diagnostic assessment of surrounding soft tissue were rated on 5-point Likert-scales. Results: In comparison to CI, VMI of higher keV-values showed strong reduction of hypo- and hyperattenuating artifacts around the port-chamber and port-catheter (CI/VMI200keV: hypodense -104.7 +/- 124.7HU/10.8 +/- 58.1HU and -101.6 +/- 101.5HU/-36.7 +/- 32.9HU; hyperdense 240.8 +/- 151.6HU/79.6 +/- 81.3HU and 108.6 +/- 129.3HU/25.9 +/- 31.9HU; all p < 0.001). Image noise could also be reduced significantly. The subjective analysis showed significantly reduced artifacts around the port-chamber and port-catheter (CI/VMI200keV: hypodense 3(1-4)/5(4-5) and 3(2-4)/5(4-5); hyperdense 3(1-4)/5(4-5) and 3(2-3)/5(3-5); all p < 0.001) and improved diagnostic assessment of pectoral/subclavian soft tissue for VMI of >= 100keV. Ratings for diagnostic assessment were best between 140-200 keV. Overall interrater agreement was high (ICC= 0.79). Conclusions: Higher keV VMI enabled a significant reduction of artifacts from port-systems around the chamber and the catheter leading to improved assessment of surrounding soft tissue.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Laukamp, Kai Roman UNSPECIFIED orcid.org/0000-0002-5600-5914 UNSPECIFIED Zopfs, David UNSPECIFIED orcid.org/0000-0001-9978-7453 UNSPECIFIED Wagner, Anton UNSPECIFIED UNSPECIFIED UNSPECIFIED Lennartz, Simon UNSPECIFIED UNSPECIFIED UNSPECIFIED Pennig, Lenhard UNSPECIFIED UNSPECIFIED UNSPECIFIED Borggrefe, Jan UNSPECIFIED orcid.org/0000-0003-2908-7560 UNSPECIFIED Ramaiya, Nikhil UNSPECIFIED UNSPECIFIED UNSPECIFIED Hokamp, Nils Grosse UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-126020
DOI:	10.1016/j.ejrad.2019.108733
Journal or Publication Title:	Eur. J. Radiol.
Volume:	121
Date:	2019
Publisher:	ELSEVIER IRELAND LTD
Place of Publication:	CLARE
ISSN:	1872-7727
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DUAL-ENERGY CT; ORTHOPEDIC HARDWARE; CONTRAST-MEDIA; SALINE FLUSH; ANGIOGRAPHY; COMPLICATIONS; PRINCIPLES Multiple languages Radiology, Nuclear Medicine & Medical Imaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12602