Fig. 4

Example of blood T2 maps acquired in one animal at different stages of hypoxemia. The four T2 maps (at τ ₁₈₀ = 12, 15, 20, and 25 ms) acquired in an animal at four different levels of inspired oxygen (FiO ₂ ) are shown. The corresponding venous (RV) and arterial (LV) O2 saturation levels measured in the right and left ventricles by invasive catheterization and blood gas analysis are shown at the top of each row. Note the decrease in T2 in both arterial and venous blood pools with increasing τ ₁₈₀ (left to right) as well as with decreasing oxygen (top to bottom)