ECG gating — types?
Prospective reduces dose; retrospective allows functional data.
ECG gating — purpose?
Synchronizes image with cardiac cycle.
Optimal heart rate — threshold?
Below 65 bpm for best image quality.
Ideal heart rate — bpm?
Below 65 bpm.
Dual-source CT — advantage?
Improves temporal resolution to ~75 ms.
Dual-source CT — advantage?
Improves temporal resolution (~75 ms).
Contrast peak — timing?
15-20 seconds after injection.
Prospective vs retrospective gating — dose?
Prospective: lower dose; retrospective: more data.
Artifacts — mitigations?
Gating, high temporal resolution, reconstruction.
Whole heart in single rotation — method?
Wide-detector CT.
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1. What is the primary advantage of prospective ECG gating in cardiac CT imaging?
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