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01.10.2011 | Chest

Dose and image quality at CT pulmonary angiography—comparison of first and second generation dual-energy CT and 64-slice CT

verfasst von: Ralf W. Bauer, Sebastian Kramer, Matthias Renker, Boris Schell, Maya Christina Larson, Martin Beeres, Thomas Lehnert, Volkmar Jacobi, Thomas J. Vogl, Josef Matthias Kerl

Erschienen in: European Radiology | Ausgabe 10/2011

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Abstract

Objective

To compare dose and image quality of 64-slice, first and second generation dual-energy CT (DECT) for CT pulmonary angiography (CTPA).

Methods

Totally 120 patients, 30 in each group, underwent CTPA on a first generation (group 1: single-energy, 120 kV/145 mAs; group 2: DE, 140/80 kV, 70/350 mAs) or second generation dual-source DECT device (group 3: DE, 100/Sn140 kV, 120/102 mAs; group 4: DE, 80/Sn140 kV, 202/86 mAs). CTDIvol, DLP, background noise (BN), thorax diameter and attenuation in the pulmonary trunk were compared.

Results

Thorax diameter and attenuation in the pulmonary trunk did not differ significantly (p > 0.4 and >0.19) between the groups. Mean CTDIvol and DLP were significantly lower (p < 0.003) in group 4 (6.2 ± 1.6 mGy/170 ± 41 mGycm) compared to group 1 (8.5 ± 2.6 mGy/235 ± 117 mGycm), group 2 (9.2 ± 3.3 mGy/224 ± 122 mGycm) and group 3 (8.7 ± 2.8 mGy/246 ± 86 mGycm). BN was significantly lower (p < 0.0001) in group 4 (12 ± 3 HU) and group 1 (13 ± 6 HU) compared to group 3 and 2 (16 ± 6 HU and 23 ± 9).

Conclusion

The use of second generation DECT in 80/Sn140 kV configuration allows for significant dose reduction with image quality similar to 120 kV CTPA.

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Titel: Dose and image quality at CT pulmonary angiography—comparison of first and second generation dual-energy CT and 64-slice CT
verfasst von: Ralf W. Bauer
Sebastian Kramer
Matthias Renker
Boris Schell
Maya Christina Larson
Martin Beeres
Thomas Lehnert
Volkmar Jacobi
Thomas J. Vogl
Josef Matthias Kerl
Publikationsdatum: 01.10.2011
Verlag: Springer-Verlag
Erschienen in: European Radiology / Ausgabe 10/2011
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-011-2162-y

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Dose and image quality at CT pulmonary angiography—comparison of first and second generation dual-energy CT and 64-slice CT