Universität zu Köln

Doerner, Jonas, Luetkens, Julian A., Iuga, Andra-Iza, Byrtus, Jonathan, Haneder, Stefan, Maintz, David and Hickethier, Tilman (2018). Poly-energetic and virtual mono-energetic images from a novel dual-layer spectral detector CT: optimization of window settings is crucial to improve subjective image quality in abdominal CT angiographies. Abdom. Radiol., 43 (3). S. 742 - 751. NEW YORK: SPRINGER. ISSN 2366-0058

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Abstract

Purpose: We aimed to determine optimal window settings for poly-energetic (PolyE) and virtual mono-energetic images (MonoE) derived from abdominal angiographic studies on a novel dual-layer spectral detector CT (SDCT) system. Methods: From 50 patients, SDCT datasets PolyE and MonoE at 70 and 40 keV levels were reconstructed and best individual window width and level (BI-W/L) manually assessed. Through regression analysis, the so-called optimized individual (OI-W/L) values were obtained. Subjective image quality parameters and vessel diameters were measured to determine influences of different W/L settings. Results: Image noise was lower and attenuation and contrast-to-noise ratio were higher in MonoE compared to PolyE (all p <= 0.002). Mean BI-W/L values for PolyE, 70, and 40 keV were 637/284, 647/291, and 1568/691, respectively. Mean OI-W/L values were 631/276, 628/286, and 1516/667, respectively. Compared to standard settings, all adjusted W/L settings varied significantly and yielded higher subjective scoring. No between-group differences were found between manually adjusted and mathematically calculated W/L settings. Conclusion: PolyE and MonoE from abdominal angiographic SDCT studies require appropriate W/L settings especially at low energy reconstruction levels. Individual adjustment reaches the best image quality but is time consuming. From our data, predefined W/L settings of 640/280 (PolyE/MonoE 70 keV) and 1570/690 (MonoE 40 keV) as a non-individualized starting point for abdominal angiographic studies from the novel SDCT system are suggested.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Doerner, Jonas UNSPECIFIED UNSPECIFIED UNSPECIFIED Luetkens, Julian A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Iuga, Andra-Iza UNSPECIFIED UNSPECIFIED UNSPECIFIED Byrtus, Jonathan UNSPECIFIED UNSPECIFIED UNSPECIFIED Haneder, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Maintz, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Hickethier, Tilman UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-193086
DOI:	10.1007/s00261-017-1241-1
Journal or Publication Title:	Abdom. Radiol.
Volume:	43
Number:	3
Page Range:	S. 742 - 751
Date:	2018
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	2366-0058
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SINGLE-ENERGY; CONTRAST; RECONSTRUCTION; DEPICTION Multiple languages Radiology, Nuclear Medicine & Medical Imaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19308