Cardiac CT Imaging Techniques

Estratto della scheda di revisione

Cardiac CT Imaging Revision Sheet

##1. 📌 Essentials

  • ECG gating synchronizes image acquisition with cardiac cycle to reduce motion artifacts.
  • Heart rate < 65 bpm is ideal for optimal image quality.
  • Dual-source CT improves temporal resolution (~75 ms), beneficial at high heart rates.
  • Contrast bolus peaks at 15-20 seconds; timing is critical for coronary artery visualization.
  • Prospective ECG gating offers lower radiation dose compared to retrospective gating.
  • Motion and blooming artifacts impair image clarity; mitigated via gating, high temporal resolution, and reconstruction.
  • Dose reduction strategies include ECG-based modulation, lower kVp/mA, and iterative algorithms. Wide-detector CT captures the entire heart in a single rotation, reducing scan time.
  • High contrast-to-noise ratio achieved with lower kVp (80-100) but requires dose adjustments.
  • Beta-blockers are often administered to control heart rate before scanning.

2. 🧩 Key Structures & Components

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Anteprima del quiz

1. What is the primary advantage of prospective ECG gating in cardiac CT imaging?

2. What is the primary advantage of prospective ECG gating in cardiac CT imaging?

3. Why is it recommended to lower the heart rate below 65 bpm before a cardiac CT scan?

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Anteprima delle flashcard

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).

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Domande frequenti

Cosa copre la scheda di revisione su Cardiac CT Imaging Techniques?

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