- FFRCT is a
- noninvasive
- image postprocessing technique that enables the
- determination of physiologic significance of coronary artery stenosis by
- using data acquired from standard, routine diagnostic coronary CT angiography studies.
- by evaluating blood pressure
- of a partially blocked artery
- Principles
- flow is proportional to pressure,
- if resistance is minimal and constant,
- pressure can be used as a surrogate of flow during maximal hyperemia.
- Thus, FFR is simply calculated by
- using the distal coronary pressure of the stenosis
- divided by the aortic pressure during maximal hyperemia.
- flow is proportional to pressure,
- dichotomous interpretation strategy to be considered in lesions with FFRCT
- greater than 0.80 (normal) or
- less than or equal to 0.75 (are associated with high likelihood of hemodynamic significance)