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Erschienen in: European Radiology 6/2014

01.06.2014 | Cardiac

Contrast agent bolus tracking with a fixed threshold or a manual fast start for coronary CT angiography

verfasst von: Fabian Stenzel, Matthias Rief, Elke Zimmermann, Johannes Greupner, Felicitas Richter, Marc Dewey

Erschienen in: European Radiology | Ausgabe 6/2014

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Abstract

Objectives

Comparison of bolus tracking with a fixed threshold versus a manual fast start for coronary CT angiography.

Methods

We retrospectively analysed 320-row coronary CT angiography of 50 patients with suspected or known coronary artery disease. Twenty-five examinations were initiated by a bolus tracking method (group 1), 25 examinations with a manual fast surestart (group 2).

Results

Mean attenuation values in the ascending aorta were 519 ± 111 Hounsfield units (HU) in group 1 and 476 ± 65 HU in group 2 (p = 0.10). Assessable vessel lengths were 171 ± 44 mm vs 172 ± 29 mm for the right coronary artery (p = 0.91), 11 ± 4 mm vs 12 ± 4 mm for the left main (p = 0.9), 163 ± 28 mm vs 151 ± 26 mm for the left anterior descending coronary artery (p = 0.11) and 125 ± 41 mm vs 110 ± 37 mm for the left circumflex coronary artery (p = 0.18). Image quality for all coronary arteries was not significantly different between the groups (p > 0.41). The attenuation ratio between the left and right ventricle was 2.8 ± 0.7 vs 3.6 ± 1.0 (p = 0.003). Significantly less contrast agent was used in group 2 (64 ± 6 ml vs 80 ± 0 ml; p < 0.001).

Conclusions

Bolus tracking with a fixed threshold and with a manual fast start are both suitable methods; the fast start allowed a reduction of contrast agent volumes.

Key Points

Fixed threshold bolus tracking is suitable for coronary 320-row CT angiography
Manual fast start bolus tracking can reduce contrast agent volumes
Manual fast start and fixed threshold initiation achieve good image quality
Fixed threshold bolus tracking achieves a more reliable contrast bolus position
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Metadaten
Titel
Contrast agent bolus tracking with a fixed threshold or a manual fast start for coronary CT angiography
verfasst von
Fabian Stenzel
Matthias Rief
Elke Zimmermann
Johannes Greupner
Felicitas Richter
Marc Dewey
Publikationsdatum
01.06.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
European Radiology / Ausgabe 6/2014
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-014-3148-3

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