Table 2.

Summary of the optical powers at tissue surface.

	$\lambda$ (nm)	$P$ (mW)	$t_{\exp }$ (ms)
DOS	686	2.7	30
DOS	751	4	30
DOS	831	4	30
DCS	786	27	2500

Note: Optical power ($P$), laser wavelength ($\lambda$), tissue exposure duration ($t_{\exp }$) of the laser source during a $\sim 7.25\text{-}\mathrm{s}$ data frame, for diffuse optical spectroscopy (DOS), and diffuse correlation spectroscopy (DCS).