Computational Fractional Flow Reserve From Coronary Computed Tomography Angiography-Optical Coherence Tomography Fusion Images in Assessing Functionally Significant Coronary Stenosis

Yong-Joon Lee, Young Woo Kim, Jinyong Ha, Minug Kim, Giulio Guagliumi, Juan F Granada, Seul-Gee Lee, Jung-Jae Lee, Yun-Kyeong Cho, Hyuck Jun Yoon, Jung Hee Lee, Ung Kim, Ji-Yong Jang, Seung-Jin Oh, Seung-Jun Lee, Sung-Jin Hong, Chul-Min Ahn, Byeong-Keuk Kim, Hyuk-Jae Chang, Young-Guk Ko, Donghoon Choi, Myeong-Ki Hong, Yangsoo Jang, Joon Sang Lee, Jung-Sun Kim, Yong-Joon Lee, Young Woo Kim, Jinyong Ha, Minug Kim, Giulio Guagliumi, Juan F Granada, Seul-Gee Lee, Jung-Jae Lee, Yun-Kyeong Cho, Hyuck Jun Yoon, Jung Hee Lee, Ung Kim, Ji-Yong Jang, Seung-Jin Oh, Seung-Jun Lee, Sung-Jin Hong, Chul-Min Ahn, Byeong-Keuk Kim, Hyuk-Jae Chang, Young-Guk Ko, Donghoon Choi, Myeong-Ki Hong, Yangsoo Jang, Joon Sang Lee, Jung-Sun Kim

Abstract

Background: Coronary computed tomography angiography (CTA) and optical coherence tomography (OCT) provide additional functional information beyond the anatomy by applying computational fluid dynamics (CFD). This study sought to evaluate a novel approach for estimating computational fractional flow reserve (FFR) from coronary CTA-OCT fusion images.

Methods: Among patients who underwent coronary CTA, 148 patients who underwent both pressure wire-based FFR measurement and OCT during angiography to evaluate intermediate stenosis in the left anterior descending artery were included from the prospective registry. Coronary CTA-OCT fusion images were created, and CFD was applied to estimate computational FFR. Based on pressure wire-based FFR as a reference, the diagnostic performance of Fusion-FFR was compared with that of CT-FFR and OCT-FFR.

Results: Fusion-FFR was strongly correlated with FFR (r = 0.836, P < 0.001). Correlation between FFR and Fusion-FFR was stronger than that between FFR and CT-FFR (r = 0.682, P < 0.001; z statistic, 5.42, P < 0.001) and between FFR and OCT-FFR (r = 0.705, P < 0.001; z statistic, 4.38, P < 0.001). Area under the receiver operating characteristics curve to assess functionally significant stenosis was higher for Fusion-FFR than for CT-FFR (0.90 vs. 0.83, P = 0.024) and OCT-FFR (0.90 vs. 0.83, P = 0.043). Fusion-FFR exhibited 84.5% accuracy, 84.6% sensitivity, 84.3% specificity, 80.9% positive predictive value, and 87.5% negative predictive value. Especially accuracy, specificity, and positive predictive value were superior for Fusion-FFR than for CT-FFR (73.0%, P = 0.007; 61.4%, P < 0.001; 64.0%, P < 0.001) and OCT-FFR (75.7%, P = 0.021; 73.5%, P = 0.020; 69.9%, P = 0.012).

Conclusion: CFD-based computational FFR from coronary CTA-OCT fusion images provided more accurate functional information than coronary CTA or OCT alone.

Clinical trial registration: [www.ClinicalTrials.gov], identifier [NCT03298282].

Keywords: computational fluid dynamics (CFD); coronary computed tomography angiography (coronary CTA); fractional flow reserve (FFR); fusion image; optical coherence tomography (OCT).

Conflict of interest statement

GG was a consultant in St. Jude Medical and has received institutional research grants. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Copyright © 2022 Lee, Kim, Ha, Kim, Guagliumi, Granada, Lee, Lee, Cho, Yoon, Lee, Kim, Jang, Oh, Lee, Hong, Ahn, Kim, Chang, Ko, Choi, Hong, Jang, Lee and Kim.

Figures

FIGURE 1
FIGURE 1
Overview of estimating CFD-based computational FFR from coronary CTA-OCT fusion images in patients with intermediate coronary stenosis. The current study evaluated a novel approach to estimate CFD-based computational FFR from coronary CTA-OCT fusion images in patients with intermediate coronary stenosis in the left anterior descending artery. CFD, computational fluid dynamics; CTA, computed tomography angiography; CT-FFR, computational FFR from coronary CTA; FFR, fractional flow reserve; Fusion-FFR, computational FFR from coronary CTA-OCT fusion images; OCT, optical coherence tomography; OCT-FFR, computational FFR from OCT.
FIGURE 2
FIGURE 2
Relationship between pressure wire-based FFR and Fusion-FFR. Correlation (A) and agreement (B) between pressure wire-based FFR and Fusion-FFR. FFR, fractional flow reserve; Fusion-FFR, computational FFR from coronary CTA-OCT fusion images.
FIGURE 3
FIGURE 3
Correlation between pressure wire-based FFR and CFD-based computational FFR from coronary CTA or OCT images. Correlation between pressure wire-based FFR and CT-FFR (A), and between FFR and OCT-FFR (B). CFD, computational fluid dynamics; CTA, computed tomography angiography; CT-FFR, computational FFR from coronary CTA; FFR, fractional flow reserve; OCT, optical coherence tomography; OCT-FFR, computational FFR from OCT.
FIGURE 4
FIGURE 4
Receiver operating characteristics curves in assessing functionally significant stenosis for CFD-based computational FFRs and anatomic variables. Receiver operating characteristics (ROC) curves with area under the curve to assess functionally significant stenosis for Fusion-FFR, OCT-FFR, CT-FFR, percentage area stenosis on OCT, and percentage coronary CTA stenosis. CFD, computational fluid dynamics; CTA, computed tomography angiography; CT-FFR, computational FFR from coronary CTA; FFR, fractional flow reserve; Fusion-FFR, computational FFR from coronary CTA-OCT fusion images; OCT, optical coherence tomography; OCT-FFR, computational FFR from OCT.

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Source: PubMed

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