European Radiology

, Volume 18, Issue 3, pp 592–599

Radiation dose estimates in dual-source computed tomography coronary angiography

Authors

  • Paul Stolzmann
    • Institute of Diagnostic RadiologyUniversity Hospital Zurich
  • Hans Scheffel
    • Institute of Diagnostic RadiologyUniversity Hospital Zurich
  • Thomas Schertler
    • Institute of Diagnostic RadiologyUniversity Hospital Zurich
  • Thomas Frauenfelder
    • Institute of Diagnostic RadiologyUniversity Hospital Zurich
  • Sebastian Leschka
    • Institute of Diagnostic RadiologyUniversity Hospital Zurich
  • Lars Husmann
    • Institute of Diagnostic RadiologyUniversity Hospital Zurich
  • Thomas G. Flohr
    • Siemens Medical Solutions
  • Borut Marincek
    • Institute of Diagnostic RadiologyUniversity Hospital Zurich
  • Philipp A. Kaufmann
    • Cardiovascular Center
    • Institute of Diagnostic RadiologyUniversity Hospital Zurich
Cardiac

DOI: 10.1007/s00330-007-0786-8

Cite this article as:
Stolzmann, P., Scheffel, H., Schertler, T. et al. Eur Radiol (2008) 18: 592. doi:10.1007/s00330-007-0786-8

Abstract

The purpose of this study was to quantify radiation dose parameters of dual-source CT coronary angiography. Eighty patients underwent contrast-enhanced, retrospectively ECG-gated dual-source CT coronary angiography with heart rate-adapted ECG pulsing using two algorithms: In 40 patients, the tube current was reduced to 20% (Amin1) of the normal tube current (Amax) outside the pulsing window; in 40 patients tube current was reduced to 4% (Amin2) of Amax. Mean CTDIvol in the Amin1 group was 45.1 ± 3.6 mGy; the mean CTDIvol in the Amin2 group was 39.1 ± 3.2 mGy, with CTDIvol in the Amin2 group being significantly reduced when compared to the Amin1 group (P < 0.001). A significant negative correlation was found between CTDIvol and heart rate in group Amin1 (r = −0.82, P < 0.001), whereas no correlation was found between CTDIvol and heart rate in group Amin2 (r = −0.066). Using the conversion coefficient for the chest, dual-source CT coronary angiography resulted in an estimated mean effective dose of 8.8 mSv in the Amin1 group and 7.8 mSv in the Amin2. Radiation exposure of dual-source CT coronary angiography using an ECG-pulsing protocol reducing the tube current to 20% significantly decreases with increasing heart rates, despite using wider pulsing windows at higher heart rates. When using a protocol with reduced tube current of 4%, the radiation dose is significantly lower, irrespective of the heart rate.

Keywords

Coronary angiography Dual-source computed tomography Radiation dose

Copyright information

© European Society of Radiology 2007