Calcium scoring with prospectively ECG-triggered CT: using overlapping datasets generated with MPR decreases...

Area of Science:

• Cardiovascular imaging
• Radiology
• Medical physics

Background:

• Calcium scoring is crucial for assessing coronary artery disease risk.
• Inter-scan variability can affect the reliability of calcium scoring results.
• Prospectively ECG-triggered scans aim to minimize motion artifacts but can still exhibit variability.

Purpose of the Study:

• To evaluate the feasibility of using overlapping 3-mm datasets from multiplanar reformation (MPR) to reduce inter-scan variability in prospectively ECG-triggered calcium-scoring scans.
• To compare the accuracy and variability of calcium scoring using MPR-generated datasets versus direct raw data reconstructions.
• To determine if MPR can improve calcium scoring consistency without increasing radiation exposure.

Main Methods:

• Seventy-five women (59-79 years) underwent two sequential prospectively ECG-triggered calcium-scoring scans.
• Calcium scoring was performed on four types of datasets: contiguous 3-mm raw data, contiguous 3-mm MPR, overlapping 3-mm MPR, and contiguous 1.5-mm raw data.
• Inter-scan variability was calculated for each dataset type and compared.

Main Results:

• Calcium scores derived from MPR (contiguous 3-mm) were nearly identical to direct raw data reconstructions (0-1% inter-scan variability).
• Median inter-scan variability was 13% (Agatston) and 11% (mass) for contiguous 3-mm MPR datasets.
• Overlapping 3-mm MPR datasets reduced median inter-scan variability to 8% (Agatston) and 7% (mass), outperforming contiguous 1.5-mm datasets.

Conclusions:

• Calcium scoring using multiplanar reformation (MPR) provides results comparable to direct reconstruction from raw data.
• Overlapping 3-mm MPR datasets significantly improve inter-scan variability in prospectively ECG-triggered calcium scoring.
• This technique enhances calcium scoring reliability without necessitating an increase in patient radiation dose.