European Radiology

, Volume 12, Issue 5, pp 1081–1086

Multislice helical CT of the heart with retrospective ECG gating: reduction of radiation exposure by ECG-controlled tube current modulation

  • Tobias F. Jakobs
  • Christoph R. Becker
  • Bernd Ohnesorge
  • Thomas Flohr
  • Christoph Suess
  • Uwe J. Schoepf
  • Maximilian F. Reiser
Open Access
Cardiac

Abstract.

Our objective was to evaluate image quality and radiation exposure of retrospectively ECG-gated multislice helical CT (MSCT) investigations of the heart with ECG-controlled tube current modulation. One hundred patients underwent MSCT scanning (Somatom VolumeZoom, Siemens, Forchheim, Germany) for detection of coronary artery calcifications. A continuous helical data set of the heart was acquired in 50 patients (group 1) using the standard protocol with constant tube current, and in 50 patients (group 2) using an alternative protocol with reduced radiation exposure during the systolic phase. The standard deviations (SD) of predefined regions of interest (ROIs) were determined as a measure of image noise and were tested for significant differences. There was no significant difference between group 1 and group 2 with respect to image noise. Radiation exposure with and without tube current modulation was 1.0 and 1.9 mSv (p<0.0001), respectively, for males and 1.4 and 2.5 mSv (p<0.0001), respectively, for females; thus, there was a mean dose reduction of 48% for males and 45% for females, respectively. The ECG-controlled tube current modulation allows significant dose reduction when performing retrospectively ECG-gated MSCT of the heart.

Multislice helical CT Coronary artery calcification Radiation exposure Retrospective ECG gating Dose reduction 

Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • Tobias F. Jakobs
    • 1
  • Christoph R. Becker
    • 1
  • Bernd Ohnesorge
    • 2
  • Thomas Flohr
    • 2
  • Christoph Suess
    • 2
  • Uwe J. Schoepf
    • 1
  • Maximilian F. Reiser
    • 1
  1. 1.Institute of Clinical Radiology, Ludwig Maximilians University Munich, Klinikum Grosshadern, Marchioninistrasse 15, 81377 Munich, GermanyGermany
  2. 2.Siemens Medical Solutions, Siemensstrasse 1, 91301 Forchheim, GermanyGermany

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