Circulation. 2006;113:1305-1310
Published online before print March 6, 2006, doi: 10.1161/CIRCULATIONAHA.105.602490
Published online before print March 6, 2006, doi: 10.1161/CIRCULATIONAHA.105.602490
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(Circulation. 2006;113:1305-1310.)
© 2006 American Heart Association, Inc.
Imaging |
Radiation Dose Estimates From Cardiac Multislice Computed Tomography in Daily Practice
Impact of Different Scanning Protocols on Effective Dose Estimates
From Klinik für Herz- und Kreislauferkrankungen (J.H., M.H., A.K., A.S.) and Institut für Radiologie und Nuklearmedizin (T.M., E.H., S.M.), Deutsches Herzzentrum München, Klinik an der TU München, Munich, Germany; and Institut für Strahlenschutz (M.Z.), GSF-Forschungszentrum für Umwelt und Gesundheit, Neuherberg, Germany.
Correspondence to Dr Jörg Hausleiter, Deutsches Herzzentrum, Lazarettstrasse 36, 80636 München, Germany. E-mail hausleiter{at}dhm.mhn.de
Received August 22, 2005; de novo received November 18, 2005; revision received January 5, 2006; accepted January 6, 2006.
Background— Multislice computed tomography angiography (CTA) is a promising technology for imaging patients with suspected coronary artery disease. Compared with 16-slice CTA, the improved spatial and temporal resolution of 64-slice CTA (0.6- versus 1.0-mm slice thickness and 330- versus 420-ms gantry rotation time) is associated with an increase in radiation dose. The objective of this retrospective investigation was to compare the estimated dose received during 16- and 64-slice CTA in daily practice and to investigate the impact of different scan protocols on dose and image quality.
Methods and Results— Radiation dose was estimated for 1035 patients undergoing coronary CTA. Scanning algorithms with and without an ECG-dependent dose modulation and with a reduced tube voltage were investigated on dose estimates and image quality. In the entire patient cohort, radiation dose estimates were 6.4±1.9 and 11.0±4.1 mSv for 16- and 64-slice CTA, respectively (P<0.01). The reduction in radiation dose estimates ranged between 37% and 40% and between 53% and 64% with the use of ECG-dependent dose modulation and with the combined use of the dose modulation and a reduced tube voltage, respectively. The reduction in dose estimates was not associated with a reduction in diagnostic image quality as assessed by the signal-to-noise ratio and by the frequency of coronary segments with diagnostic image quality.
Conclusions— The increase in spatial and temporal resolution with 64-slice CTA is associated with an increased radiation dose for coronary CTA. Dose-saving algorithms are very effective in reducing radiation exposure and should be used whenever possible.
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