New radiation dose saving technologies for 256-slice cardiac computed tomography angiography

  • Matthew J. Walker
  • Mark E. Olszewski
  • Milind Y. Desai
  • Sandra S. Halliburton
  • Scott D. Flamm
Original Paper

Abstract

Purpose This paper aims to evaluate the dose reductions conferred by spiral dynamic z-collimation and axial adaptive z-collimation for retrospectively and prospectively ECG-referenced cardiac CTA, respectively, on a wide coverage, 256-slice CT scanner. Methods Using typical data presented in the literature, a distribution of cardiac CT scan lengths was synthesized. To isolate the effect of z-overscan on effective radiation dose, 1,000 simulated patient scan lengths were then randomly sampled from this distribution and used for subsequent analysis. Results Retrospectively ECG-gated spiral scans with dynamic z-collimation resulted in a mean relative effective dose reduction of 11.7 and 24.3% for MDCT with 40 and 80 mm z-axis detector coverage, respectively. Mean relative dose reduction of prospectively ECG-triggered axial scans with adaptive z-collimation on an 80 mm coverage scanner was 10.0%. Conclusion Dynamic z-collimation for retrospectively ECG-gated spiral scanning and adaptive z-collimation for prospectively ECG-triggered axial scanning are both associated with a significant dose reduction on a wide coverage, 256-slice CT scanner.

Keywords

256-Slice MDCT Prospective triggering Retrospective gating Radiation exposure Radiation reduction Coronary CT angiography Step-and-shoot Low dose Dose efficiency 

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Copyright information

© Springer Science+Business Media, B.V. 2009

Authors and Affiliations

  • Matthew J. Walker
    • 1
  • Mark E. Olszewski
    • 1
  • Milind Y. Desai
    • 2
    • 3
  • Sandra S. Halliburton
    • 3
    • 4
  • Scott D. Flamm
    • 2
    • 3
  1. 1.CT Clinical SciencePhilips HealthcareClevelandUSA
  2. 2.Department of Cardiovascular Medicine, Heart and Vascular InstituteCleveland ClinicClevelandUSA
  3. 3.Cardiovascular Imaging Laboratory, Department of Radiology, Imaging InstituteCleveland ClinicClevelandUSA
  4. 4.Department of Biomedical EngineeringCleveland ClinicClevelandUSA

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