Fractional flow reserve-computed tomography (FFR-CT). More detail you can see 'Noninvasive FFR derived from coronary CT angiography in the management of coronary artery disease: technology and clinical update' (by Nakanishi R, Budoff MJ; Vascular Health and Risk Management 2016;12:269—278; DOI https://doi.org/10.2147/VHRM.S79632)   OR use link https://www.dovepress.com/noninvasive-ffr-derived-from-coronary-ct-angiography-in-the-management-peer-reviewed-fulltext-article-VHRM        

FFR-CT is a novel technology that enables determination of the functional significance of lesions noninvasively, using sophisticated computer algorithms based on computational fluid dynamics applied to coronary CTA . There is evidence from several randomized studies, comparing FFR-CT with invasive FFR (representing the gold standard), that FFR-CT can be helpful in evaluation of hemodynamic significance of stenosis, especially in patients with intermediate severity stenosis.

-B.K. Koo The present and future of fractional flow reserve

Circulation Journal, 78 (2014), pp. 1048–1054

-Noninvasive Fractional Flow Reserve Derived From Coronary CT Angiography Clinical Data and Scientific Principles

James K. Min, Charles A. Taylor, Stephan Achenbach, Bon Kwon Koo, Jonathon Leipsic, Bjarne L. Nørgaard, Nico J. Pijls, Bernard De Bruyne JACC: CARDIOVASCULAR IMAGING, VOL. 8, NO. 10, 2015

Noninvasive Fractional Flow Reserve From CT OCTOBER 2015:1209 – 2 2

-Noninvasive FFR derived from coronary CT angiography in the management of coronary artery disease: Technology and clinical update

Matthew Budoff, Rine Nakansihi, Vascular Health and Risk Management 2016;12:269—278

Fractional Flow Reserve-FFR ; Fraction of hymodynamic in Stenosed Vessel: Normal Vessel. FFR of 70% reflects a 30% drop in Hemodynamics.

Computed tomography-derived FFR[CT-FFR]

Employs ; Modeling of coronary arteries &  blood flow

Prior Technology had Poor Correlation With Invasive Coronary Angiography[ICA] but Using 3D FFRCT +Heart Flow FFR-CT SoftWare, Results are PRETTY KOOL.

The results showed that Heart Flow FFR-CT was able to correctly identify 84 % of the significant blockages identified by FFR as requiring intervention, and 86 % of blockages identified by FFR as not requiring intervention.

Each method has its Pros & Cons, but with latest advances in Hemodynamic Software, CT-FFR will replace ICA.

https://www.dicardiology.com/product/fda-clears-ffr-ct

• FFR is used to access the functional significance of coronary arterial lession. Invasive FFR is gold standard for diagnosis of significance of coronary arterial lession. FDA have approved CT FFR in evaluation of the significance of coronary arterial lession in 2014.PLATFORM trial had showed CT FFR had eliminated 61percent need of invasive coronary angiography and 32percent reduction of cost ...futute of its seems promising.. Thanks