Pearson correlation coefficients (micro-CT vs FTIRI) of depth-wise image intensities at different time points (18, 36, 54, 72, 90, 180, 270 h) of (PTA, top) and (PMA, bottom) labeling of horse AC. Correlation coefficients 0.95 or greater are in green. The highest correlations were obtained with 36 h and 54 h immersion in PTA