Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
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SHR Neuro Krebs Kardio Lipid Stoffw Microb
Sudarski, S; Apfaltrer, P; Nance, JW; Schneider, D; Meyer, M; Schoenberg, SO; Fink, C; Henzler, T.
Optimization of keV-settings in abdominal and lower extremity dual-source dual-energy CT angiography determined with virtual monoenergetic imaging.
Eur J Radiol. 2013; 82(10):e574-e581
Doi: 10.1016/j.ejrad.2013.04.040
Web of Science
PubMed
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FullText_MUG
- Co-Autor*innen der Med Uni Graz
- Apfaltrer Paul
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- Abstract:
- To compare objective image quality indices in dual-energy CT angiography (DE-CTA) studies of the abdomen and lower extremity using conventional polyenergetic images (PEIs) and virtual monoenergetic images (MEIs) at different kiloelectron volt (keV) levels. We retrospectively evaluated 68 dual-source DE-CTA studies. 50 patients (42 men, 71 ± 10 years) underwent abdominal DE-CTA. 18 patients (13 men, 67 ± 10 years) underwent lower extremity DE-CTA. MEIs from 40 to 120 keV were reconstructed. Signal intensity, noise, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were assessed in infrarenal aorta, superior mesenteric, external iliac, femoral, popliteal, and lower leg arteries. Comparisons between MEIs and PEIs were performed with Dunnett's test. 222 arteries were evaluated. In abdominal arteries 70 keV MEIs showed statistically equal signal intensity, noise and CNR levels (+13%; +31%, -14% on average; all p>0.05) compared to PEIs; SNR was equal or slightly impaired (-7% on average; p<0.001-1.00). In lower extremity arteries 60 keV MEIs resulted in significantly higher signal intensity and CNR (+54%; +54% on average; all p<0.05) compared to PEIs at equal noise levels (+18% on average; all p>0.05) and equal or higher SNR (+49% on average; p<0.01-0.35). Low-keV MEIs lead to equal or higher signal intensity and CNR compared to PEIs. In lower extremity DE-CTA, additional reconstruction of low-keV MEIs at 60 keV might increase diagnostic confidence. Copyright © 2013 Elsevier Ireland Ltd. All rights reserved.
- Find related publications in this database (using NLM MeSH Indexing)
- Abdomen - blood supply
- Aged -
- Aged, 80 and over -
- Algorithms -
- Angiography - methods
- Aortography - methods
- Female -
- Humans -
- Lower Extremity - blood supply
- Lower Extremity - diagnostic imaging
- Male -
- Middle Aged -
- Radiographic Image Enhancement - methods
- Radiography, Abdominal - methods
- Radiography, Dual-Energy Scanned Projection - methods
- Reproducibility of Results -
- Sensitivity and Specificity -
- Tomography, X-Ray Computed - methods
- Find related publications in this database (Keywords)
- CT angiography
- Dual-source CT
- Dual-energy CT
- Monoenergetic Image quality