<s>
Magnetic	B-Algorithm
resonance	I-Algorithm
spectroscopic	I-Algorithm
imaging	I-Algorithm
(	O
MRSI	O
)	O
is	O
a	O
noninvasive	O
imaging	B-Application
method	O
that	O
provides	O
spectroscopic	O
information	O
in	O
addition	O
to	O
the	O
image	O
that	O
is	O
generated	O
by	O
MRI	B-Algorithm
alone	O
.	O
</s>
<s>
Whereas	O
traditional	O
magnetic	O
resonance	O
imaging	B-Application
(	O
MRI	B-Algorithm
)	O
generates	O
a	O
black-and-white	O
image	O
in	O
which	O
brightness	O
is	O
determined	O
primarily	O
by	O
the	O
T1	O
or	O
T2	O
relaxation	O
times	O
of	O
the	O
tissue	O
being	O
imaged	O
,	O
the	O
spectroscopic	O
information	O
obtained	O
in	O
an	O
MRSI	O
study	O
can	O
be	O
used	O
to	O
infer	O
further	O
information	O
about	O
cellular	O
activity	O
(	O
metabolic	O
information	O
)	O
.	O
</s>
<s>
For	O
example	O
,	O
in	O
the	O
context	O
of	O
oncology	O
,	O
an	O
MRI	B-Algorithm
scan	O
may	O
reveal	O
the	O
shape	O
and	O
size	O
of	O
a	O
tumor	O
,	O
while	O
an	O
MRSI	O
study	O
provides	O
additional	O
information	O
about	O
the	O
metabolic	O
activity	O
occurring	O
in	O
the	O
tumor	O
.	O
</s>
<s>
MRSI	O
can	O
be	O
performed	O
on	O
a	O
standard	O
MRI	B-Algorithm
scanner	O
,	O
and	O
the	O
patient	O
experience	O
is	O
the	O
same	O
for	O
MRSI	O
as	O
for	O
MRI	B-Algorithm
.	O
</s>
<s>
When	O
hydrogen	O
is	O
the	O
target	O
element	O
,	O
MRSI	O
is	O
also	O
called	O
1H-nuclear	O
magnetic	B-Algorithm
resonance	I-Algorithm
spectroscopic	I-Algorithm
imaging	I-Algorithm
and	O
proton	O
magnetic	B-Algorithm
resonance	I-Algorithm
spectroscopic	I-Algorithm
imaging	I-Algorithm
.	O
</s>
