<s>
Structured	B-Algorithm
Light	I-Algorithm
Plethysmography	I-Algorithm
(	O
SLP	O
)	O
technology	O
is	O
a	O
noninvasive	O
method	O
for	O
collecting	O
accurate	O
representations	O
of	O
chest	O
and	O
abdominal	O
wall	O
movement	O
.	O
</s>
<s>
Movements	O
of	O
the	O
grid	O
are	O
viewed	O
by	O
two	O
digital	B-Device
cameras	I-Device
,	O
digitalised	O
,	O
and	O
processed	O
to	O
form	O
a	O
3D	O
model	O
and	O
can	O
be	O
interrogated	O
to	O
assess	O
lung	O
function	O
.	O
</s>
<s>
A	O
totally	O
“	O
non-invasive	O
”	O
technique	O
using	O
structured	B-General_Concept
light	I-General_Concept
to	O
measure	O
pulmonary	O
function	O
was	O
developed	O
as	O
long	O
ago	O
as	O
the	O
mid-1980s	O
by	O
a	O
London	O
group	O
at	O
the	O
Royal	O
Brompton	O
Hospital	O
working	O
in	O
close	O
association	O
with	O
IBM	O
(	O
1-4	O
)	O
.	O
</s>
<s>
At	O
that	O
time	O
structured	B-General_Concept
light	I-General_Concept
pattern	O
was	O
shone	O
on	O
to	O
the	O
anterior	O
chest	O
and	O
abdominal	O
wall	O
surfaces	O
,	O
and	O
movie	O
camera	O
film	O
footage	O
was	O
taken	O
and	O
sent	O
to	O
IBM	O
for	O
processing	O
.	O
</s>
<s>
However	O
,	O
probably	O
due	O
to	O
technology	O
limitations	O
,	O
data	B-General_Concept
processing	I-General_Concept
and	O
storage	O
,	O
the	O
methodology	O
was	O
never	O
commercialised	O
.	O
</s>
<s>
The	O
methodology	O
has	O
several	O
advantages	O
:	O
there	O
are	O
no	O
fluorescent	O
markers	O
required	O
to	O
define	O
chest	O
or	O
abdominal	O
surface	O
and	O
the	O
hardware	O
can	O
be	O
minimalized	O
to	O
2	O
digital	B-Device
cameras	I-Device
and	O
a	O
digital	O
projector	O
when	O
imaging	O
the	O
anterior	O
surface	O
of	O
the	O
body	O
.	O
</s>
<s>
The	O
2	O
digital	B-Device
cameras	I-Device
image	O
the	O
grid	O
on	O
chest	O
and	O
abdomen	O
and	O
the	O
software	O
extracts	O
2	O
sets	O
of	O
2D	O
image	O
positions	O
of	O
the	O
grid	O
points	O
and	O
stereo	O
vision	O
is	O
used	O
to	O
reconstruct	O
these	O
grid	O
points	O
to	O
form	O
a	O
3D	O
representation	O
of	O
the	O
chest	O
and	O
abdominal	O
wall	O
surface	O
.	O
</s>
