Multiple Dose Reduction Techniques With Subtraction Coronary CT Angiography for Patients With High Calcification...

Area of Science:

• Cardiovascular Imaging
• Radiology
• Medical Physics

Background:

• Coronary artery calcification poses challenges for CT angiography interpretation.
• Dose reduction techniques are crucial for patient safety in cardiovascular imaging.

Purpose of the Study:

• To evaluate the efficacy of various dose reduction strategies in subtraction coronary CT angiography (S-CCTA).
• To assess the impact of these strategies on image quality and diagnostic accuracy in patients with high coronary artery calcification scores.

Main Methods:

• Fifty patients with high calcification scores underwent S-CCTA using multiple dose reduction techniques (e.g., narrowed windows, lower tube voltage/current, AIDR).
• Subjective and objective image quality assessments were performed.
• Diagnostic accuracy was compared to contrast-enhanced CCTA (C-CCTA) using invasive coronary angiography (ICA) as the gold standard.

Main Results:

• Mean effective radiation dose was 1.08±0.29 mSv.
• No significant difference in image quality between C-CCTA and S-CCTA.
• S-CCTA demonstrated superior sensitivity (87.50%) and specificity (92.58%) compared to C-CCTA (P<0.001).
• S-CCTA significantly improved diagnostic accuracy across all calcification severities.

Conclusions:

• Multiple dose reduction techniques effectively decrease radiation dose in S-CCTA.
• S-CCTA enhances diagnostic accuracy for classifying calcified coronary stenoses, particularly in patients with significant calcification.