ECG gating — types?
Prospective reduces dose; retrospective allows functional data.
Optimal heart rate — threshold?
Below 65 bpm for best image quality.
Dual-source CT — advantage?
Improves temporal resolution to ~75 ms.
ECG gating — purpose?
Synchronizes image with cardiac cycle.
Ideal heart rate — bpm?
Below 65 bpm.
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.
Answer 9 questions on Cardiac CT Imaging Techniques.
1. What is the primary advantage of prospective ECG gating in cardiac CT imaging?
2. Why is it recommended to lower the heart rate below 65 bpm before a cardiac CT scan?
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