Fig. 7.

(a) Fluorescence lifetime image of upper dermis; (b) decay curve of the marked pixel (arrowhead; elastin fiber) in (a); (c) single photon counting image (pixel color: $\le 800=\text{green}$; $>800=\text{red}$); and (d) magnified section of the framed part in (c). Scale bar: $40\mu \mathrm{m}$.