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• FFR_CT 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.
  • dichotomous interpretation strategy to be considered in lesions with FFR_CT
    • greater than 0.80 (normal) or
    • less than or equal to 0.75 (are associated with high likelihood of hemodynamic significance)