title: Dose and image quality at CT pulmonary angiography-comparison of first and second generation dual-energy CT and 64-slice CT.
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).
  
  
  CONCLUSIONS
  The use of second generation DECT in 80/Sn140 kV configuration allows for significant dose reduction with image quality similar to 120 kV CTPA.
authors: Department of Diagnostic and Interventional Radiology, Clinic of the Goethe University, Frankfurt am Main, Germany. ralfwbauer@aol.com
authors: Ralf W
authors: RW
authors: Bauer
authors: Sebastian
authors: S
authors: Kramer
authors: Matthias
authors: M
authors: Renker
authors: Boris
authors: B
authors: Schell
authors: Maya Christina
authors: MC
authors: Larson
authors: Martin
authors: M
authors: Beeres
authors: Thomas
authors: T
authors: Lehnert
authors: Volkmar
authors: V
authors: Jacobi
authors: Thomas J
authors: TJ
authors: Vogl
authors: Josef Matthias
authors: JM
authors: Kerl
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