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==Planning==
{{Heart imaging before surgery or intervention - choice of modality}}
===Settings===
*'''Prospective ECG triggering''' is used in most instances, which is associated with significant reduction in radiation dose.<ref name="RajiahSchoenhagen2013"/>
*'''Retrospective ECG-gated acquisition''' (with dose modulation) is mostly limited to situations when information from all the phases of cardiac cycle is required, particularly for 4D imaging. Another indication is a patient with high and irregular heart rate.<ref name="RajiahSchoenhagen2013"/>
*'''Non-ECG-gated''' scanning is used to reduce radiation dose if motion artefact is not a major concern, e.g. for left atrial assessment in patients with atrial fibrillation.<ref name="RajiahSchoenhagen2013"/>
==Evaluation==
