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Electrocardiogram-gated coronary CT angiography dose estimates using ImPACT.

Masanao Kobayashi1, Yasuki Asada, Kosuke Matsubara

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Area of Science:

  • Medical Physics
  • Radiology
  • Cardiovascular Imaging

Background:

  • Accurate radiation dose assessment is crucial for cardiac CT applications.
  • Existing dosimetry methods may require adaptation for specific cardiac imaging protocols.

Purpose of the Study:

  • To evaluate radiation doses using a modified Imaging Performance Assessment of Computed Tomography (ImPACT) dosimetry for cardiac CT on an Aquilion ONE ViSION Edition scanner.
  • To compare the modified ImPACT method with a whole-body phantom study and the k-factor method for dose verification.

Main Methods:

  • Utilized a modified ImPACT dosimetry for various cardiac CT protocols (Ca score, CTA, CFA).
  • Determined the relationship between heart rate (HR) and X-ray exposure using CT dose index (CTDI).
  • Compared dose results with a whole-body dosimetry phantom and the k-factor method.

Main Results:

  • The modified ImPACT method provided effective dose estimates approximately 10% lower than the phantom study.
  • The k-factor method yielded significantly lower effective doses compared to both ImPACT and phantom methods.
  • Modified ImPACT successfully assessed both absorbed and effective radiation doses.

Conclusions:

  • Modified ImPACT dosimetry is a practical and promising method for assessing radiation doses in cardiac CT applications, particularly for coronary CTA.
  • The study validates the utility of ImPACT for patient-specific dosimetry in cardiovascular imaging.