European Radiology

, Volume 21, Issue 10, pp 2139–2147 | Cite as

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

  • Ralf W. BauerEmail author
  • Sebastian Kramer
  • Matthias Renker
  • Boris Schell
  • Maya Christina Larson
  • Martin Beeres
  • Thomas Lehnert
  • Volkmar Jacobi
  • Thomas J. Vogl
  • Josef Matthias Kerl



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


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.


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).


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


Dual-energy CT 64-slice CT Pulmonary embolism Dose Image quality 



Dr. Ralf Bauer and Dr. J. Kerl are research consultants and representatives of the Speaker’s Bureau of Siemens Healthcare.


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Copyright information

© European Society of Radiology 2011

Authors and Affiliations

  • Ralf W. Bauer
    • 1
    Email author
  • Sebastian Kramer
    • 1
  • Matthias Renker
    • 1
  • Boris Schell
    • 1
  • Maya Christina Larson
    • 1
  • Martin Beeres
    • 1
  • Thomas Lehnert
    • 1
  • Volkmar Jacobi
    • 1
  • Thomas J. Vogl
    • 1
  • Josef Matthias Kerl
    • 1
  1. 1.Department of Diagnostic and Interventional RadiologyClinic of the Goethe UniversityFrankfurt am MainGermany

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