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Eur Radiol. 2013 Jul;23(7):1822-8. doi: 10.1007/s00330-013-2793-2. Epub 2013 May 4.

Prospectively ECG-triggered sequential dual-source coronary CT angiography in patients with atrial fibrillation: comparison with retrospectively ECG-gated helical CT.

Author information

  • 1Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, No.2, Anzhen Road, Chaoyang District, 100029 Beijing, China. leixu2001@hotmail.com

Abstract

OBJECTIVE:

To investigate the feasibility of applying prospectively ECG-triggered sequential coronary CT angiography (CCTA) to patients with atrial fibrillation (AF) and evaluate the image quality and radiation dose compared with a retrospectively ECG-gated helical protocol.

METHODS:

100 patients with persistent AF were enrolled. Fifty patients were randomly assigned to a prospective protocol and the other patients to a retrospective protocol using a second-generation dual-source CT (DS-CT). Image quality was evaluated using a four-point grading scale (1 = excellent, 2 = good, 3 = moderate, 4 = poor) by two reviewers on a per-segment basis. The coronary artery segments were considered non-diagnostic with a quality score of 4. The radiation dose was evaluated.

RESULTS:

Diagnostic segment rate in the prospective group was 99.4 % (642/646 segments), while that in the retrospective group was 96.5 % (604/626 segments) (P < 0.001). Effective dose was 4.29 ± 1.86 and 11.95 ± 5.34 mSv for each of the two protocols (P < 0.001), which was a 64 % reduction in the radiation dose for prospective sequential imaging compared with retrospective helical imaging.

CONCLUSION:

In AF patients, prospectively ECG-triggered sequential CCTA is feasible using second-generation DS-CT and can decrease >60 % radiation exposure compared with retrospectively ECG-gated helical imaging while improving diagnostic image quality.

KEY POINTS:

• Coronary computed tomographic angiography (CCTA) can be difficult in patients with arrhythmias. • Prospectively ECG-triggered sequential CCTA is feasible in patients with atrial fibrillation. • Prospective sequential imaging can improve quality compared with retrospective analysis. • Prospective sequential imaging decreases radiation exposure by 64 % compared with retrospective mode.

PMID:
23645328
[PubMed - indexed for MEDLINE]
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