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03.09.2015 | Computed Tomography

Advanced image-based virtual monoenergetic dual-energy CT angiography of the abdomen: optimization of kiloelectron volt settings to improve image contrast

verfasst von: Moritz H. Albrecht, Jan-Erik Scholtz, Kristina Hüsers, Martin Beeres, Andreas M. Bucher, Moritz Kaup, Simon S. Martin, Sebastian Fischer, Boris Bodelle, Ralf W. Bauer, Thomas Lehnert, Thomas J. Vogl, Julian L. Wichmann

Erschienen in: European Radiology | Ausgabe 6/2016

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Abstract

Objectives

To compare quantitative image quality parameters in abdominal dual-energy computed tomography angiography (DE-CTA) using an advanced image-based (Mono+) reconstruction algorithm for virtual monoenergetic imaging and standard DE-CTA.

Methods

Fifty-five patients (36 men; mean age, 64.2 ± 12.7 years) who underwent abdominal DE-CTA were retrospectively included. Mono + images were reconstructed at 40, 50, 60, 70, 80, 90 and 100 keV levels and as standard linearly blended M_0.6 images (60 % 100 kV, 40 % 140 kV). The contrast-to-noise ratio (CNR) and signal-to-noise ratio (SNR) of the common hepatic (CHA), splenic (SA), superior mesenteric (SMA) and left renal arteries (LRA) were objectively measured.

Results

Mono+ DE-CTA series showed a statistically superior CNR for 40, 50, 60, 70 and 80 keV (P < 0.031) compared to M_0.6 images for all investigated arteries except SMA at 80 keV (P = 0.08). CNR at 40 keV revealed a mean relative increase of 287.7 % compared to linearly blended images among all assessed arteries (P < 0.001). SNR of Mono+ images was consistently significantly higher at 40, 50, 60 and 70 keV compared to M_0.6 for CHA and SA (P < 0.009).

Conclusions

Compared to linearly blended images, Mono+ reconstructions at low keV levels of abdominal DE-CTA datasets significantly improve quantitative image quality.

Key Points

• Mono+ combines increased attenuation with reduced image noise compared to standard DE-CTA.

• Mono+ shows superior contrast-to-noise ratios at low keV compared to linearly-blended images.

• Contrast-to-noise ratio in monoenergetic DE-CTA peaks at 40 keV.

• Mono+ reconstructions significantly improve quantitative image quality at low keV levels.

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Titel: Advanced image-based virtual monoenergetic dual-energy CT angiography of the abdomen: optimization of kiloelectron volt settings to improve image contrast
verfasst von: Moritz H. Albrecht
Jan-Erik Scholtz
Kristina Hüsers
Martin Beeres
Andreas M. Bucher
Moritz Kaup
Simon S. Martin
Sebastian Fischer
Boris Bodelle
Ralf W. Bauer
Thomas Lehnert
Thomas J. Vogl
Julian L. Wichmann
Publikationsdatum: 03.09.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: European Radiology / Ausgabe 6/2016
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-015-3970-2

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Advanced image-based virtual monoenergetic dual-energy CT angiography of the abdomen: optimization of kiloelectron volt settings to improve image contrast

Abstract

Objectives

Methods

Results

Conclusions

Key Points

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Springer Medizin

Abstract

Objectives

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Conclusions

Key Points

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