ArticleJournal of the Saudi Heart Association2026
Quantifying Patient Positioning Errors and Radiation Dose Variation in Cardiac Computed Tomography Angiography.
Article in Journal of the Saudi Heart Association, 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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Authors and funding
6 authors.
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Abstract
Objectives: Accurate patient centring at the computed tomography (CT) scanner isocentre is essential for optimising radiation dose. This study aimed to quantify positioning errors, assess their relationship with radiation dose, and estimate the potential dose reduction achievable with optimal centring. Methods: This retrospective observational study included adult patients (≥18 years) who underwent electrocardiography (ECG)-gated cardiac CT angiography between January 2023 and July 2025 at a tertiary hospital. Scans were performed using Siemens SOMATOM Force dual-source CT systems. Vertical and lateral deviations from the scanner isocentre were calculated from scout images using integrated analytics within the institutional dose monitoring platform (Qaelum NV, Leuven, Belgium). Radiation dose indices, including the volume-weighted CT dose index (CTDI Results: Data from 399 patients were evaluated. Significant off-centring (>10 mm) occurred in 83% of scans in the anteroposterior (AP) direction and 50% laterally. Severe AP off-centring (>30 mm) was present in 39% of cases. Off-centring showed no independent association with CTDI Conclusion: Patient off-centring was highly prevalent in cardiac CT examinations. No independent association between off-centring and radiation dose was observed when adjusting for BMI, age, and sex. Literature-based scenario modelling suggests that meaningful radiation dose reductions may be achievable with optimum centring, although this requires prospective confirmation.
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