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Radiation dose estimates in dual-source computed tomography coronary angiography

Paul Stolzmann, Hans Scheffel, Thomas Schertler, Thomas Frauenfelder, Sebastian Leschka, Lars Husmann, Thomas G Flohr, Borut Marincek, Philipp A Kaufmann & Hatem Alkadhi

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% (A(min1)) of the normal tube current (A(max)) outside the pulsing window; in 40 patients tube current was reduced to 4% (A(min2)) of A(max). Mean CTDI(vol) in the A(min1) group was 45.1 +/- 3.6 mGy; the mean CTDI(vol) in the A(min2) group was 39.1 +/- 3.2 mGy, with CTDI(vol) in the A(min2) group being significantly reduced when compared to the A(min1) group (P < 0.001). A significant negative correlation was found between CTDI(vol) and heart rate in group A(min1) (r = -0.82, P < 0.001), whereas no correlation was found between CTDI(vol) and heart rate in group A(min2) (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 A(min1) group and 7.8 mSv in the A(min2). 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.
   
citation Stolzmann P, Scheffel H, Schertler T, Frauenfelder T, Leschka S, Husmann L, Flohr T G, Marincek B, Kaufmann P A, Alkadhi H. Radiation dose estimates in dual-source computed tomography coronary angiography. Eur Radiol 2008; 18:592-9.
   
type journal paper/review (English)
date of publishing 3-2008
journal title Eur Radiol (18/3)
ISSN print 0938-7994
pages 592-9
PubMed 17909816
DOI 10.1007/s00330-007-0786-8