There are multiple definitions:
perfusable tissue index(English)
- represents the fraction of extravascular tissue being perfused by water, is a marker of viable myocardium, and can be calculated as the ratio of PTF and ATF
- PTF, ATF, CFR
- Coronary circulation, Medical imaging, Ratio-based metric
- http://www.turk…_h2o_heart.html
percentage thickness index(English)
- a Scheimpflug-based topographer referring to the percentage of increase in corneal thickness from the thinnest point to the periphery
- CTSP, IVA, PPI
- Ophthalmology
- https://doi.org…ijo.IJO_2111_20
post-transfusion increase(English)