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Abstract #4557

Navigator Artefact Reduction in 3D Late Gadolinium Enhancement Imaging

Jennifer Keegan1, Peter Drivas2, David N. Firmin1, 3

1Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield NHS Trust, London, United Kingdom; 2Cardiovascular Biomedical Research Unit, Royal Brompton Hospital, London, United Kingdom; 3Imperial College, London, United Kingdom

Navigator-gated 3D late gadolinium enhancement (LGE) imaging demonstrates the degree and distribution of atrial scarring both before and after RF ablation of atrial fibrillation. An artefact originating from the slice-selective navigator-restore pulse is frequently present in the right pulmonary veins, obscuring the vein and atrial walls and making quantification of enhancement difficult. We describe a simple sequence modification to remove this artefact and demonstrate its application in 9 patients.

Keywords

ablation accuracy acquisition acquisitions allows alternatively aorta appear applicable application assessed atria atrial away beam benefit biomedical blinded blood cardiac cardiovascular centric characteristic circulation clinical college compensation compromise consensus control crossed cycles degree delay depended depends descending detection determined diaphragm diaphragmatic distribution duration edge efficiency either eliminated eliminates enables encoding enhancement example excluded extent fibrillation flow flows fold forming gadolinium gated gating ghosting gradient immediately imperial implemented improves inferior inflow inside intensity inversion inverted inverts kingdom late mild moderate modification modified motion navigator noise nominal none observers original paired pairs patients pencil peter peters position positioning preparation prepared prior projection propose prospective prospectively pulmonary pulse quality quantification radiology receiving recovery reduced reduces reduction removing required residual resolution respiratory restore royal scale scarring score scores selective severe sharpness simple slab slice slices subject subjective subjects superior thick timing trace traces track tracking trust typically unaffected unit unmodified vein veins views wave window