OBJECTIVE: Computed tomography (CT) of the paranasal sinus is the standard diagnostic tool for a wide range of indications in mostly younger patients. This study aims to assess the image quality of CT of the sinus by using a high-pitch dual-source technique with special regard to the radiation dose. METHODS: Examinations were performed on a second-generation dual-source CT with a pitch factor of 3.0 (dual-source mode). Images were compared with those with a pitch factor of 0.9 on the same system (single-source mode) and with those of 16-slice CT. Image quality was evaluated by four blinded readers using a 5-point scale (1=poor, 5=excellent). Comparison of the dose length product (DLP) was used to estimate radiation exposure. RESULTS: Seventy-three consecutive patients underwent imaging with the proposed CT protocols. The viewers rated the image quality of the dual-source image sets as nearly as good (3.62) as the single-source images on the same device (4.18) and those on 16-slice CT (3.7). DLP was cut to half of the dose [51 mGycm vs. 97.8 mGycm vs. 116.9 mGycm (p<0.01)]. CONCLUSIONS: Using the proposed dual-source mode when examining the paranasal sinus, diagnostic image quality can be achieved while drastically lowering the patient's radiation exposure.
OBJECTIVE: Computed tomography (CT) of the paranasal sinus is the standard diagnostic tool for a wide range of indications in mostly younger patients. This study aims to assess the image quality of CT of the sinus by using a high-pitch dual-source technique with special regard to the radiation dose. METHODS: Examinations were performed on a second-generation dual-source CT with a pitch factor of 3.0 (dual-source mode). Images were compared with those with a pitch factor of 0.9 on the same system (single-source mode) and with those of 16-slice CT. Image quality was evaluated by four blinded readers using a 5-point scale (1=poor, 5=excellent). Comparison of the dose length product (DLP) was used to estimate radiation exposure. RESULTS: Seventy-three consecutive patients underwent imaging with the proposed CT protocols. The viewers rated the image quality of the dual-source image sets as nearly as good (3.62) as the single-source images on the same device (4.18) and those on 16-slice CT (3.7). DLP was cut to half of the dose [51 mGycm vs. 97.8 mGycm vs. 116.9 mGycm (p<0.01)]. CONCLUSIONS: Using the proposed dual-source mode when examining the paranasal sinus, diagnostic image quality can be achieved while drastically lowering the patient's radiation exposure.
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Authors: Martin Beeres; Boris Schell; Aristidis Mastragelopoulos; Eva Herrmann; Josef Matthias Kerl; Tatjana Gruber-Rouh; Clara Lee; Petra Siebenhandl; Boris Bodelle; Stephan Zangos; Thomas J Vogl; Volkmar Jacobi; Ralf W Bauer Journal: Eur Radiol Date: 2011-09-14 Impact factor: 5.315
Authors: J L Wichmann; J Kraft; E-M Nöske; B Bodelle; I Burck; J-E Scholtz; C Frellesen; J Wagenblast; J M Kerl; R W Bauer; T Lehnert; T J Vogl; B Schulz Journal: AJNR Am J Neuroradiol Date: 2014-08-07 Impact factor: 3.825