Fig. 4.

(a) Image of relative hemoglobin oxygenation measured using PA data at 100 % oxygen supply. In the colormap, red indicates oxygenated, and blue indicates deoxygenated hemoglobin (GD 14). (b) Plot of mean relative sPO₂ of placentas (n = 3 per animal) with standard deviation and (c) Plot of mean relative sPO₂ of maternal common iliac arteries (n = 2 per animal) with standard deviation versus arterial oxygenation measured by pulse oximeter at GD 14. Scale bar is 3 mm. A video of reconstructed colormap of 3D volume is provided in the Supplementary.