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Cardiac CT motion artifacts like blur, transition, interpolation, and duplication can often be fixed without rescanning. Techniques include adjusting cardiac phase, using motion-correction algorithms, and manipulating electrocardiographic (ECG) sync-points.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Cardiovascular Imaging

Background:

  • Motion artifacts are common in cardiac CT, impacting image quality despite technical advances.
  • These artifacts can arise from patient motion, breathing, or cardiac dynamics.
  • While some artifacts necessitate repeat scans, others are correctable.

Purpose of the Study:

  • To review and categorize common cardiac motion artifacts in CT.
  • To discuss mitigation strategies for various artifact types without repeating scans.
  • To highlight the role of electrocardiographic (ECG) synchronization in artifact correction.

Main Methods:

  • Categorization of cardiac motion artifacts into blur, transition, interpolation, and duplication.
  • Description of artifact causes related to scanner parameters and patient physiology.
  • Explanation of mitigation techniques including cardiac phase selection, motion-correction algorithms, and ECG sync-point manipulation.

Main Results:

  • Blur artifacts are mitigated by adjusting cardiac phase, using motion-correction algorithms, or multisegment reconstruction.
  • Transition artifacts can be addressed by altering cardiac phase or employing edge-correction algorithms.
  • Interpolation and duplication artifacts are often resolved by editing or composing ECG sync-points, especially in cases of arrhythmias.

Conclusions:

  • Cardiac motion artifacts, though common, can be effectively managed through various techniques.
  • Specific strategies exist for blur, transition, interpolation, and duplication artifacts.
  • ECG sync-point manipulation is a key method for correcting interpolation and duplication artifacts, improving cardiac CT image quality.