ArticleEuropean radiology2026
First performance test of a dual wide-coverage CT system.
Article in European radiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study presents a comprehensive performance test of a dual-source wide-coverage CT system, which integrates two 16-cm detectors and two corresponding X-ray tubes on a single gantry. The architecture of the CT system and a dedicated cross-scatter correction algorithm are described, the latter of which is developed for this particular dual wide-coverage geometry and combines physical modeling with empirical calibration. The implemented correction was demonstrated to be effective in reducing cross-scatter artifacts, with preserved spatial resolution (difference < 0.5% at 10% MTF) and low-contrast detectability (3 mm at 0.3% contrast, at a volume CT dose index of 47.6 mGy and a slice thickness of 1.0 mm) after correction. Temporal resolution was assessed using an ECG-signal-driven dynamic phantom, tested with the dual wide-coverage acquisition mode. It provided motion-artifact-free images under simulated sinus rhythm at 100 bpm and arrhythmic conditions varying between 75 and 100 bpm. Clinical performance was further illustrated in a patient with a mean heart rate of 197 bpm, in whom CCTA acquired with this mode showed clear and sharp coronary arteries with minimal motion artifact at a radiation dose of 1.48 mSv. The dual wide-coverage CT system successfully integrates 16-cm wide z-axis coverage with high temporal resolution of the dual-source system, demonstrating potential for advanced dynamic cardiac imaging. KEY POINTS: Question Current CT systems require a compromise between wide z-axis coverage and high temporal resolution, limiting optimal performance in patients with high or irregular heart rates. Findings A novel dual wide-coverage CT system achieved high temporal resolution and motion-artifact-free images across high and irregular heart rates, with effective cross-scatter correction preserving spatial and low-contrast resolution. Clinical relevance The dual wide-coverage CT system enables high-quality coronary CT angiography with high or irregular heart rates, expanding the clinical utility of cardiac CT.
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