The influence of image quality on diagnostic performance of a machine learning–based fractional flow reserve derived from coronary CT angiography

2020 ◽  
Vol 30 (5) ◽  
pp. 2525-2534 ◽  
Author(s):  
Peng Peng Xu ◽  
Jian Hua Li ◽  
Fan Zhou ◽  
Meng Di Jiang ◽  
Chang Sheng Zhou ◽  
...  
Keyword(s):  
Machine Learning ◽  
Image Quality ◽  
Ct Angiography ◽  
Fractional Flow Reserve ◽  
Diagnostic Performance ◽  
Coronary Ct Angiography ◽  
Fractional Flow ◽  
Coronary Ct ◽  
Flow Reserve

scholarly journals Inter-operator reliability of an onsite machine learning-based prototype to estimate CT angiography-derived fractional flow reserve

2021 ◽  
Vol 22 (Supplement_3) ◽  
Author(s):  
Y Han ◽  
AI Ahmed ◽  
C Schwemmer ◽  
M Cocker ◽  
T Alnabelsi ◽  
...  
Keyword(s):  
Machine Learning ◽  
Ct Angiography ◽  
Fractional Flow Reserve ◽  
Coronary Ct Angiography ◽  
Cardiac Risk ◽  
Altman Analysis ◽  
Fractional Flow ◽  
Limits Of Agreement ◽  
Coronary Ct ◽  
Flow Reserve

Abstract Funding Acknowledgements Type of funding sources: None. Background Advances in computed tomography (CT) and machine learning have enabled on-site non-invasive assessment of fractional flow reserve (ML-FFRCT). However, reproducibility of measurements across operators is not well demonstrated. Purpose This study was designed to measure the inter-operator variability and reproducibility of Coronary CT Angiography–derived fractional flow reserve values using a post-processing prototype based on a machine learning algorithm (ML-FFRCT). Methods We included 60 symptomatic patients who underwent coronary CT angiography. FFRCT was calculated by 2 independent operators after training using a machine learning based on-site prototype. FFRCT was measured 1 cm distal to the coronary plaque or in the middle of the segments if no coronary lesions were present.  Intraclass correlation coefficient (ICC) and Bland-Altman analysis were used to evaluate inter-operator variability effect in FFRCT estimates. Sensitivity analysis was done by cardiac risk factors, degree of stenosis and image quality. Results A total of 535 coronary segments in 60 patients were assessed. The overall ICC was 0.986 per patient (95% CI: 0.977 - 0.992) and 0.972 per segment (95% CI: 0.967 - 0.977). The absolute mean difference in FFRCT estimates was 0.012 per patient (95% CI for limits of agreement: -0.035 - 0.039) and 0.02 per segment (95% CI for limits of agreement: -0.077 - 0.080). Tight limits of agreement were seen on Bland-Altman analysis. Distal segments had greater variability compared to proximal/mid segments (absolute mean difference 0.011 vs 0.025, p < 0.001). Sensitivity analysis showed similar results across degrees of stenosis, image quality and those with cardiac risk factors such as hypertension, diabetes and dyslipidemia. Conclusion A high degree of inter-operator reproducibility can be achieved by onsite machine learning based ML-FFRCT assessment. Future research is required to evaluate the physiological relevance and prognostic value of ML-FFRCT.

scholarly journals Diagnostic Performance of On-Site Coronary CT Angiography–derived Fractional Flow Reserve Based on Patient-specific Lumped Parameter Models

2019 ◽  
Vol 1 (4) ◽  
pp. e190036 ◽  
Author(s):  
Robbert W. van Hamersvelt ◽  
Michiel Voskuil ◽  
Pim A. de Jong ◽  
Martin J. Willemink ◽  
Ivana Išgum ◽  
...  
Keyword(s):  
Ct Angiography ◽  
Fractional Flow Reserve ◽  
Diagnostic Performance ◽  
Coronary Ct Angiography ◽  
Patient Specific ◽  
Fractional Flow ◽  
Coronary Ct ◽  
Flow Reserve ◽  
Lumped Parameter ◽  
Lumped Parameter Models
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