<s>
Time-domain	B-Algorithm
diffuse	I-Algorithm
optics	I-Algorithm
or	O
time-resolved	O
functional	B-Algorithm
near-infrared	I-Algorithm
spectroscopy	I-Algorithm
is	O
a	O
branch	O
of	O
functional	B-Algorithm
near-Infrared	I-Algorithm
spectroscopy	I-Algorithm
which	O
deals	O
with	O
light	O
propagation	O
in	O
diffusive	O
media	O
.	O
</s>
<s>
Moreover	O
,	O
the	O
penetration	O
depth	O
in	O
TD	O
depends	O
solely	O
on	O
the	O
photon	O
arrival	O
times	O
and	O
is	O
independent	O
of	O
the	O
source-detector	O
separation	O
unlike	O
in	O
CW	B-Algorithm
approach	I-Algorithm
.	O
</s>
<s>
The	O
theory	O
of	O
light	O
propagation	O
in	O
diffusive	O
media	O
is	O
usually	O
dealt	O
with	O
using	O
the	O
framework	O
of	O
radiative	B-Algorithm
transfer	I-Algorithm
theory	I-Algorithm
under	O
the	O
multiple	O
scattering	O
regime	O
.	O
</s>
<s>
It	O
has	O
been	O
demonstrated	O
that	O
radiative	O
transfer	O
equation	O
under	O
the	O
diffusion	B-Algorithm
approximation	I-Algorithm
yields	O
sufficiently	O
accurate	O
solutions	O
for	O
practical	O
applications	O
.	O
</s>
<s>
The	O
final	O
DTOF	O
is	O
a	O
convolution	B-Language
of	O
the	O
instrument	O
response	O
function	O
(	O
IRF	O
)	O
of	O
the	O
system	O
with	O
the	O
theoretical	O
reflectance	O
curve	O
.	O
</s>
<s>
Instrumentation	O
in	O
time-domain	B-Algorithm
diffuse	I-Algorithm
optics	I-Algorithm
consists	O
of	O
three	O
fundamental	O
components	O
namely	O
,	O
a	O
pulsed	O
laser	O
source	O
,	O
a	O
single	O
photon	O
detector	O
and	O
a	O
timing	O
electronics	O
.	O
</s>
