Figure 5.
OPT imaging of collagen fiber organization in articular cartilage. (a) A direct comparison of the fiber orientations obtained using the split-line method and OPT. The short split lines indicate the cracks produced using a fine needle. (b) The correlation between split lines and OPT results measured in five cartilage samples. (c) The 3D tractography of a piece of cartilage and a comparison of the fiber orientation at the side of the sample obtained by computationally projecting the 3D tractography to the side with the results directly imaged from the side. The images in (a) and (b) are adapted from Yao et al.42; the images in (c) are adapted from Wang et al.43 (A color version of this figure is available in the online journal.)
OPT: optical polarization tractography.