Universität zu Köln

Slebocki, Karin, Kraus, Bastian, Chang, De-Hua, Hellmich, Martin, Maintz, David and Bangard, Christopher (2017). Incidental Findings in Abdominal Dual-Energy Computed Tomography: Correlation Between True Noncontrast and Virtual Noncontrast Images Considering Renal and Liver Cysts and Adrenal Masses. J. Comput. Assist. Tomogr., 41 (2). S. 294 - 298. PHILADELPHIA: LIPPINCOTT WILLIAMS & WILKINS. ISSN 1532-3145

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Abstract

Purpose: To assess correlation between attenuation measurements of incidental findings in abdominal second generation dual-energy computed tomography (CT) on true noncontrast (TNC) and virtual noncontrast (VNC) images. Materials and Methods: Sixty-three patients underwent arterial dual-energy CT (Somatom Definition Flash, Siemens; pitch factor, 0.75-1.0; gantry rotation time, 0.28 seconds) after endovascular aneurysm repair, consisting of a TNC single energy CT scan (collimation, 128 x 0.6 mm; 120 kVp) and a dual-energy arterial phase scan (collimation, 32 x 0.6 mm, 140 and 100 kVp; blended, 120 kVp data set). Attenuation measurements in Hounsfield units (HU) of liver parenchyma and incidental findings like renal and hepatic cysts and adrenal masses on TNC and VNC images were done by drawing regions of interest. Statistical analysis was performed by paired t test and Pearson correlation. Results: Incidental findings were detected in 56 (89%) patients. There was excellent correlation for both renal (n = 40) and hepatic cysts (n = 12) as well as adrenal masses (n = 6) with a Pearson correlation of 0.896, 0.800, and 0.945, respectively, and mean attenuation values on TNC and VNC images of 10.6 HU +/- 12.8 versus 5.1 HU +/- 17.5 (attenuation value range from -8.8 to 59.1 HU vs -11.8 to 73.4 HU), 6.4 HU +/- 5.8 versus 6.3 HU +/- 4.6 (attenuation value range from 2.0 to 16.2 HU vs -3.0 to 15.9 HU), and 12.8 HU +/- 11.2 versus 12.4 HU +/- 10.2 (attenuation value range from -2.3 to 27.5 HU vs -2.2 to 23.6 HU), respectively. As proof of principle, liver parenchyma measurements also showed excellent correlation between TNC and VNC (n = 40) images with a Pearson correlation of 0.839 and mean attenuation values on TNC and VNC images of 47.2 HU +/- 10.5 versus 43.8 HU +/- 8.7 (attenuation value range from 21.9 to 60.2 HU vs 4.5 to 65.3 HU). Conclusions: In conclusion, attenuation measurements of incidental findings like renal cysts or adrenal masses on TNC and VNC images derived from second generation dual-energy CT scans show excellent correlation providing considerable dose savings, favorable for future application in clinical routine.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Slebocki, Karin UNSPECIFIED UNSPECIFIED UNSPECIFIED Kraus, Bastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Chang, De-Hua UNSPECIFIED UNSPECIFIED UNSPECIFIED Hellmich, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Maintz, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Bangard, Christopher UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-238061
DOI:	10.1097/RCT.0000000000000503
Journal or Publication Title:	J. Comput. Assist. Tomogr.
Volume:	41
Number:	2
Page Range:	S. 294 - 298
Date:	2017
Publisher:	LIPPINCOTT WILLIAMS & WILKINS
Place of Publication:	PHILADELPHIA
ISSN:	1532-3145
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ATTENUATION VALUES; IODINE OVERLAY; CT; DISCRIMINATION; PERFORMANCE; PREVALENCE; ABDOMEN; BENIGN; REPAIR Multiple languages Radiology, Nuclear Medicine & Medical Imaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23806