Universität zu Köln

Doerner, Jonas, Wybranski, Christian, Byrtus, Jonathan, Houbois, Christian, Hauger, Myriam, Heneweer, Carola, Siedek, Florian, Hickethier, Tilman, Hokamp, Nils Grosse, Maintz, David and Haneder, Stefan (2017). Intra-individual comparison between abdominal virtual mono-energetic spectral and conventional images using a novel spectral detector CT. PLoS One, 12 (8). SAN FRANCISCO: PUBLIC LIBRARY SCIENCE. ISSN 1932-6203

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Abstract

Objectives To quantitatively and qualitatively assess abdominal arterial and venous phase contrast-enhanced spectral detector computed tomography (SDCT) virtual mono-energetic (MonoE) datasets in comparison to conventional CT reconstructions provided by the same system. Materials and methods Conventional and MonoE images at 40-120 kilo-electron volt (keV) levels with a 10 keV increment as well as 160 and 200 keV were reconstructed in abdominal SDCT datasets of 55 patients. Attenuation, image noise, and contrast-/signal-to-noise ratios (CNR, SNR) of vessels and solid organs were compared between MonoE and conventional reconstructions. Two readers assessed contrast conditions, detail visualization, overall image quality and subjective image noise with both, fixed and adjustable window settings. Results Attenuation, CNR and SNR of vessels and solid organs showed a stepwise increase from high to low keV reconstructions in both contrast phases while image noise stayed stable at low keV MonoE reconstruction levels. Highest levels were found at 40 keV MonoE reconstruction (p< 0.001), respectively. Solid abdominal organs showed a stepwise decrease from low to high energy levels in regard to attenuation, CNR and SNR with significantly higher values at 40 and 50 keV, compared to conventional images. The 70 keV MonoE was comparable to conventional poly-energetic reconstruction (p >= 0.99). Subjective analysis displayed best image quality for the 70 keV MonoE reconstruction level in both phases at fixed standard window presets and at 40 keV if window settings could be adjusted. Conclusion SDCT derived low keV MonoE showed markedly increased CNR and SNR values due to constantly low image noise values over the whole energy spectrum from 40 to 200 keV.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Doerner, Jonas UNSPECIFIED UNSPECIFIED UNSPECIFIED Wybranski, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Byrtus, Jonathan UNSPECIFIED UNSPECIFIED UNSPECIFIED Houbois, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Hauger, Myriam UNSPECIFIED UNSPECIFIED UNSPECIFIED Heneweer, Carola UNSPECIFIED UNSPECIFIED UNSPECIFIED Siedek, Florian UNSPECIFIED UNSPECIFIED UNSPECIFIED Hickethier, Tilman UNSPECIFIED UNSPECIFIED UNSPECIFIED Hokamp, Nils Grosse UNSPECIFIED UNSPECIFIED UNSPECIFIED Maintz, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Haneder, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-221489
DOI:	10.1371/journal.pone.018375
Journal or Publication Title:	PLoS One
Volume:	12
Number:	8
Date:	2017
Publisher:	PUBLIC LIBRARY SCIENCE
Place of Publication:	SAN FRANCISCO
ISSN:	1932-6203
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DUAL-ENERGY CT; KILOELECTRON VOLT SETTINGS; ANGIOGRAPHY; RECONSTRUCTION; OPTIMIZATION; QUALITY; ALGORITHM; CONTRAST Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22148