title: Dose levels at coronary CT angiography--a comparison of Dual Energy-, Dual Source- and 16-slice CT.
abstract: OBJECTIVE
  To compare the dose estimates and image quality of Dual Energy CT (DECT), Dual Source CT (DSCT) and 16-slice CT for coronary CT angiography (cCTA).
  
  
  METHODS
  Sixty-eight patients were examined with 16 - slice MDCT (group 1), 68 patients with DSCT (group 2) and 68 patients using DSCT in dual energy mode (DECT group 3). CT dose index volume, dose length product, effective dose, signal-to-noise, and contrast-to-noise ratio were compared. Subjective image quality was rated by two observers, blinded to technique.
  
  
  RESULTS
  The mean estimated radiation dose of all patients investigated on a 16 - slice MDCT was 12 ± 3.59 mSv, for DSCT in single energy 9.8 ± 4.77 mSv and for DECT 4.54 ± 1.87 mSv. Dose for CTA was significantly lower in group 3 compared to group 1 and 2. The image noise was significantly lower in Group 2 in comparison to group 1 and group 3. There was no significant difference in diagnostic image quality comparing DECT and DSCT.
  
  
  CONCLUSIONS
  cCTA shows better dose levels at both DECT and DSCT compared to 16-slice CT. Further, DECT delivers significantly less dose than regular DSCT or single source single energy cCTA while maintaining diagnostic image quality.
authors.affiliation: Department of Diagnostic and Interventional Radiology, Johann Wolfgang Goethe-University, Theodor Stern Kai 7, 60590, Frankfurt, Germany. matthias.kerl@gmail.com
authors.forename: J Matthias
authors.initials: JM
authors.lastname: Kerl
authors.forename: Ralf W
authors.initials: RW
authors.lastname: Bauer
authors.forename: Tobias B
authors.initials: TB
authors.lastname: Maurer
authors.forename: Rene
authors.initials: R
authors.lastname: Aschenbach
authors.forename: Huedayi
authors.initials: H
authors.lastname: Korkusuz
authors.forename: Thomas
authors.initials: T
authors.lastname: Lehnert
authors.forename: Simon
authors.initials: S
authors.lastname: Deseive
authors.forename: Hanns
authors.initials: H
authors.lastname: Ackermann
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Vogl
mesh_terms: D000368:Aged; D001822:Body Burden; D017023:Coronary Angiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D011829:Radiation Dosage; D015900:Radiography, Dual-Energy Scanned Projection / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*