Generative Models for Reproducible Coronary Calcium Scoring

TL;DR

This paper introduces a generative adversarial network-based method for coronary calcium scoring that improves interscan reproducibility without relying on fixed intensity thresholds, potentially enhancing CHD risk assessment.

Contribution

It presents a novel CycleGAN approach for CAC quantification that does not require threshold-based segmentation, outperforming manual clinical scoring in reproducibility.

Findings

47% relative interscan difference in CAC mass

Intraclass correlation coefficient of 0.96 for proposed method

Improved reproducibility over manual scoring

Abstract

Purpose: Coronary artery calcium (CAC) score, i.e. the amount of CAC quantified in CT, is a strong and independent predictor of coronary heart disease (CHD) events. However, CAC scoring suffers from limited interscan reproducibility, which is mainly due to the clinical definition requiring application of a fixed intensity level threshold for segmentation of calcifications. This limitation is especially pronounced in non-ECG-synchronized CT where lesions are more impacted by cardiac motion and partial volume effects. Therefore, we propose a CAC quantification method that does not require a threshold for segmentation of CAC. Approach: Our method utilizes a generative adversarial network where a CT with CAC is decomposed into an image without CAC and an image showing only CAC. The method, using a CycleGAN, was trained using 626 low-dose chest CTs and 514 radiotherapy treatment planning CTs. Interscan reproducibility was compared to clinical calcium scoring in radiotherapy treatment planning CTs of 1,662 patients, each having two scans. Results: A lower relative interscan difference in CAC mass was achieved by the proposed method: 47% compared to 89% manual clinical calcium scoring. The intraclass correlation coefficient of Agatston scores was 0.96 for the proposed method compared to 0.91 for automatic clinical calcium scoring. Conclusions: The increased interscan reproducibility achieved by our method may lead to increased reliability of CHD risk categorization and improved accuracy of CHD event prediction.