Fig. 11.

SHG images of articular cartilage. (a–d) SHG images at depths around 10, 20, 30, and $40\mu \mathrm{m}$, in the superficial zone. (e–h) SHG images at depths around 80, 100, 120, and $140\mu \mathrm{m}$, in the transitional zone. (i–l) SHG images at depths around 500 to $600\mu \mathrm{m}$ with $20\text{-}\mu \mathrm{m}$ step size. Scale bar is $30\mu \mathrm{m}$.