Key result
An image-based gating method integrating motion signals improved heartbeat period detection in IVUS studies, achieving a coefficient of reproducibility of 0.23 s versus 0.36 s for the closest method.
The proposed image-based gating method improves the accuracy and reliability of cardiac phase extraction in IVUS studies compared to existing methods.
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Enhances IVUS gating precision in research; leaves open clinical translation and outcome impact.
UNLABELLED: GOAL: Coronary intravascular ultrasound (IVUS) is a fundamental imaging technique for atherosclerotic plaque assessment. However, volume-based data retrieved from IVUS studies can be misleading due to the artifacts generated by the cardiac motion, hindering diagnostic, and visualization of the vessel condition. Then, we propose an image-based gating method that improves the performance of the preexisting methods, delivering a gating in an appropriate time for clinical practice. METHODS: We propose a fully automatic method to synergically integrate motion signals from different gating methods to improve the cardiac phase estimation. Additionally, we present a local extrema identification method that provides a more accurate extraction of a cardiac phase and, also, a scheme for multiple phase extraction mandatory for elastography-type studies. RESULTS: A comparison with three state-of-the-art methods is performed over 61 in-vivo IVUS studies including a wide range of physiological situations. The results show that the proposed strategy offers: 1) a more accurate cardiac phase extraction; 2) a lower frame oversampling and/or omission in the extracted phase data (error of 1.492 ±0.977 heartbeats per study, mean ± SD); 3) a more accurate and robust heartbeat period detection with a Bland-Altman coefficient of reproducibility (RPC) of 0.23 s, while the second closest method presents an RPC of 0.36 s. SIGNIFICANCE: The integration of motion signals performed by our method shown an improvement of the gating accuracy and reliability.
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Talou et al. (2015) studied Atherosclerotic plaque (n=61). Image-based gating method integrating motion signals vs. Three state-of-the-art methods was evaluated on Heartbeat period detection (Bland-Altman coefficient of reproducibility). An image-based gating method integrating motion signals improved heartbeat period detection in IVUS studies, achieving a coefficient of reproducibility of 0.23 s versus 0.36 s for the closest method.
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