Universität zu Köln

Doerner, Jonas, Hauger, Myriam, Hickethier, Tilman, Byrtus, Jonathan, Wybranski, Christian, Hokamp, Nils Grosse, Maintz, David and Haneder, Stefan (2017). Image quality evaluation of dual-layer spectral detector CT of the chest and comparison with conventional CT imaging. Eur. J. Radiol., 93. S. 52 - 59. CLARE: ELSEVIER IRELAND LTD. ISSN 1872-7727

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Abstract

Objectives: To evaluate image quality parameters of virtual mono-energetic (MonoE) and conventional (CR) imaging derived from a dual-layer spectral detector CT (DLCT) in oncological follow-up venous phase imaging of the chest and comparison with conventional multi-detector CT (CRMDCT) imaging. Materials and methods: A total of 55 patients who had oncologic staging with conventional CT and DLCT of the chest in venous phase were included in this study. Established image quality parameters were derived from all datasets in defined thoracic landmarks. Attenuation, image noise, and signal-/ contrast-to noise ratios (SNR, CNR) were compared between CRDLCT and MonoE as well as CRMDCT imaging. Two readers performed subjective image analysis. Results: CRMDCT showed significant lower attenuation values compared to CRDLCT and MonoE at 40-70 keV (p <= 0.05). Moreover, MonoE at 40-70 keV revealed significantly higher attenuations values compared to CRDLCT (p < 0.001). Noise was statistically lower in CRMDCT compared with CRDLCT and MonoE at 40 keV (11.4 +/- 2.3 HU vs. 12.0 +/- 3.1 HU vs. 11.7 +/- 5.2 HU; p < 0.001). In contrast, all MonoE levels showed significantly lower noise levels compared to CRDLCT (p < 0.001). SNR was not significantly different between CRMDCT and CRDLCT (13.5 +/- 3.7 vs. 14.4 +/- 5.3; p > 0.99). SNR values were significantly increased for MonoE at 40-80 keV compared to CRMDCT and CRDLCT (p < 0.001). CRDLCT and MonoE (40-70 keV) from DLCT revealed significantly higher CNR values than CRMDCT (p < 0.001). In subjective analysis, MonoE at 40 keV surpassed all other image reconstructions except for noise in MonoE at 70 keV. Conclusion: In dual-layer spectral detector CT, MonoE at low keV showed superior image quality compared to conventional images derived from the same system and may therefore be added to clinical routine imaging protocols. Whether MonoE reconstructions yield additional diagnostic information is still unknown.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Doerner, Jonas UNSPECIFIED UNSPECIFIED UNSPECIFIED Hauger, Myriam UNSPECIFIED UNSPECIFIED UNSPECIFIED Hickethier, Tilman UNSPECIFIED UNSPECIFIED UNSPECIFIED Byrtus, Jonathan UNSPECIFIED UNSPECIFIED UNSPECIFIED Wybranski, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Hokamp, Nils Grosse UNSPECIFIED UNSPECIFIED UNSPECIFIED Maintz, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Haneder, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-224011
DOI:	10.1016/j.ejrad.2017.05.016
Journal or Publication Title:	Eur. J. Radiol.
Volume:	93
Page Range:	S. 52 - 59
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; RECONSTRUCTION; ANGIOGRAPHY; OPTIMIZATION; ALGORITHM; SETTINGS Multiple languages Radiology, Nuclear Medicine & Medical Imaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22401