Cross-Domain Knowledge Transfer from Expert-Annotated Gated CT via Synthetic Ungated CT Improves Coronary Artery Calcium Scoring on CT Attenuation Correction Scans
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Background
Coronary artery calcium (CAC) is an established measure of coronary atherosclerosis from computed tomography (CT). While deep learning (DL) can quantify CAC from non-dedicated CT, the accuracy is limited by image quality.
Purpose
We derived and validated a novel method for DL CAC segmentation on ultra-low dose CT attenuation correction (CTAC) scans that is trained with synthetic low-dose, ungated images.
Materials and Methods
Models were trained using one center and externally tested in two other centers. Synthetic, ungated CT scans were generated so that expert segmentations from dedicated CAC scans could be used as ground truth for perfectly registered synthetic images through knowledge adaptation (KAD-CAC). We evaluated agreement between CAC scoring methods vs expert readers on a per-patient and per-vessel basis, as well as associations with the primary outcome of death or myocardial infarction (MI).
Results
The DL models were externally tested on 5969 patients with a median age of 64 (IQR 56 – 73), of whom 50.2% were male. The KAD-CAC model had higher Cohen’s kappa K (0.86, 95% CI 0.85 – 0.87) compared to previous convolutional LSTM model (K 0.78, 95% CI 0.76 – 0.80, p<0.01), or models trained with only gated images (K 0.81, 95% CI 0.80 – 0.82, p<0.01). Net reclassification improvement for CAC stratified risk of death or MI, was greatest for the KAD-CAC model over baseline including age, sex, hypertension, diabetes, dyslipidemia, family history, smoking, stress total perfusion deficit, and left ventricular ejection fraction.
Conclusion
We use paired synthetic ungated scans to transfer expert gated CAC annotations into the ungated domain, resulting in substantially better vessel-level CAC scoring and improved risk stratification.
Summary Statement
By transferring information from expert-annotated gated CT to synthetic ungated CT, a knowledge-adapted deep learning model substantially improved coronary artery calcium assessment on low-dose attenuation correction CT.
Key Results
In external testing using 5969 patients from two sites, the proposed model had improved agreement with expert segmentation and provided the greatest net reclassification improvement for CAC stratified risk of death or MI over baseline including age, sex, hypertension, diabetes, dyslipidemia, family history, smoking, stress total perfusion deficit, and Left Ventricular Ejection Fraction.
