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

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.

journal_name

Eur Radiol

journal_title

European radiology

authors

Stenzel F,Rief M,Zimmermann E,Greupner J,Richter F,Dewey M

doi

10.1007/s00330-014-3148-3

subject

Has Abstract

pub_date

2014-06-01 00:00:00

pages

1229-38

issue

6

eissn

0938-7994

issn

1432-1084

journal_volume

24

pub_type

杂志文章

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