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European Radiology

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Open Access 01-06-2012 | Cardiac

Prospective ECG triggering reduces prosthetic heart valve-induced artefacts compared with retrospective ECG gating on 256-slice CT

Authors: Petr Symersky, Jesse Habets, Paul Westers, Bas A. J. M. de Mol, Mathias Prokop, Ricardo P. J. Budde

Published in: European Radiology | Issue 6/2012

Abstract

Objectives

Multidetector computed tomography (MDCT) has diagnostic value for the evaluation of prosthetic heart valve (PHV) dysfunction but it is hampered by artefacts. We hypothesised that image acquisition using prospective triggering instead of retrospective gating would reduce artefacts related to pulsating PHV.

Methods

In a pulsatile in vitro model, a mono- and bileaflet PHV were imaged using 256 MDCT at 60, 75 and 90 beats per minute (BPM) with either retrospective gating (120 kV, 600 mAs, pitch 0.2, CTDI_vol 39.8 mGy) or prospective triggering (120 kV, 200 mAs, CTDI_vol 13.3 mGy). Two thresholds (>175 and <−45HU), derived from the density of surrounding structures, were used for quantification of hyper- and hypodense artefacts. Image noise and artefacts were compared between protocols.

Results

Prospective triggering reduced hyperdense artefacts for both valves at every BPM (P = 0.001 all comparisons). Hypodense artefacts were reduced for the monoleaflet valve at 60 (P = 0.009), 75 (P = 0.016) and 90 BPM (P = 0.001), and for the bileaflet valves at 60 (P = 0.001), 90 (P = 0.001) but not at 75 BPM (P = 0.6). Prospective triggering reduced image noise at 60 (P = 0.001) and 75 (P < 0.03) but not at 90 BPM.

Conclusions

Compared with retrospective gating, prospective triggering reduced most artefacts related to pulsating PHV in vitro.

Key Points

• Computed tomographic images are often degraded by prosthetic heart valve-induced artefacts

• Prospective triggering reduces prosthetic heart valve-induced artefacts in vitro

• Artefact reduction at 90 beats per minute occurs without image noise reduction

• Prospective triggering may improve CT image quality of moving hyperdense structures

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Title: Prospective ECG triggering reduces prosthetic heart valve-induced artefacts compared with retrospective ECG gating on 256-slice CT
Authors: Petr Symersky
Jesse Habets
Paul Westers
Bas A. J. M. de Mol
Mathias Prokop
Ricardo P. J. Budde
Publication date: 01-06-2012
Publisher: Springer-Verlag
Published in: European Radiology / Issue 6/2012
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-011-2358-1

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Prospective ECG triggering reduces prosthetic heart valve-induced artefacts compared with retrospective ECG gating on 256-slice CT

Abstract

Objectives

Methods

Results

Conclusions

Key Points

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Objectives

Methods

Results

Conclusions

Key Points

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