Synthetic haematocrit
HCT = 816.325 × (1 / T1blood) + 0.024 × sex − 0.094 × scanner − 0.027
Sex: male 1, female 0. Scanner: 1.5 T 1, 3 T 0 (this tool is fixed to 1.5 T). T1 in ms; the result is a fraction, shown here as a percentage to one decimal. Intended for synthetic ECV when a same-day haematocrit is unavailable; the tool warns when the T1 is outside 1000–2500 ms.
Chen W, et al. Synthetic extracellular volume in cardiac magnetic resonance without blood sampling. Circ Cardiovasc Imaging 2022;15:e013745. DOI