<s>
The	O
Liver	O
Imaging	O
Reporting	O
and	O
Data	O
System	O
(	O
aka	O
LI-RADS	B-Algorithm
)	O
is	O
a	O
quality	O
assurance	O
tool	O
created	O
and	O
trademarked	O
by	O
the	O
American	O
College	O
of	O
Radiology	O
in	O
2011	O
to	O
standardize	O
the	O
reporting	O
and	O
data	O
collection	O
of	O
CT	O
and	O
MR	O
imaging	O
patients	O
at	O
risk	O
for	O
hepatocellular	O
carcinoma	O
(	O
HCC	O
)	O
,	O
or	O
primary	O
cancer	O
of	O
the	O
liver	O
cells	O
.	O
</s>
<s>
Importantly	O
,	O
the	O
increasing	O
acceptance	O
of	O
the	O
LI-RADS	B-Algorithm
system	O
of	O
reporting	O
by	O
referring	O
clinicians	O
(	O
chiefly	O
oncologists	O
,	O
hepatobiliary	O
and	O
liver	O
transplant	O
surgeons	O
)	O
has	O
reduced	O
the	O
need	O
for	O
tissue	O
biopsy	O
confirmation	O
of	O
cancer	O
in	O
patients	O
with	O
chronic	O
liver	O
disease	O
.	O
</s>
<s>
The	O
LI-RADS	B-Algorithm
system	O
has	O
undergone	O
two	O
revisions	O
,	O
first	O
in	O
2014	O
,	O
and	O
again	O
in	O
July	O
2018	O
.	O
</s>
<s>
In	O
2016	O
,	O
the	O
ACR	O
published	O
a	O
version	O
of	O
LI-RADS	B-Algorithm
which	O
applies	O
to	O
contrast-enhanced	O
ultrasound	O
imaging	O
,	O
termed	O
CEUS	O
LI-RADS	B-Algorithm
.	O
</s>
<s>
The	O
5	O
tiers	O
of	O
the	O
LI-RADS	B-Algorithm
reporting	O
system	O
are	O
designed	O
to	O
correspond	O
to	O
the	O
5	O
tier	O
classification	O
recommended	O
by	O
the	O
United	O
Network	O
for	O
Organ	O
Sharing	O
(	O
UNOS	O
)	O
which	O
administers	O
OPTN	O
.	O
</s>
<s>
For	O
all	O
intents	O
and	O
purposes	O
,	O
OPTN/UNOS	O
classes	O
1-5	O
correspond	O
to	O
LI-RADS	B-Algorithm
1-5	O
classification	O
,	O
although	O
there	O
are	O
some	O
small	O
differences	O
:	O
</s>
<s>
OPTN	O
class	O
0	O
(	O
incomplete	O
or	O
technically	O
inadequate	O
imaging	O
study	O
)	O
has	O
no	O
corresponding	O
LI-RADS	B-Algorithm
category	O
.	O
</s>
<s>
Although	O
there	O
are	O
5	O
levels	O
of	O
classification	O
,	O
the	O
most	O
significant	O
and	O
only	O
actionable	O
classification	O
is	O
LI-RADS	B-Algorithm
or	O
OPTN/UNOS	O
5	O
,	O
which	O
indicates	O
that	O
a	O
nodule	O
is	O
"	O
definitely	O
"	O
cancer	O
.	O
</s>
<s>
Natural	B-Language
language	I-Language
processing	I-Language
tool	O
available	O
for	O
computation	O
of	O
LI-RADS	B-Algorithm
assessment	O
category	O
from	O
the	O
findings	O
recorded	O
in	O
the	O
textual	O
radiology	O
reports	O
(	O
documented	O
without	O
LI-RADS	B-Algorithm
template	O
)	O
which	O
may	O
enable	O
standardizing	O
screening	O
recommendations	O
and	O
treatment	O
planning	O
of	O
patients	O
at	O
risk	O
for	O
hepatocellular	O
carcinoma	O
by	O
using	O
same	O
scoring	O
criteria	O
.	O
</s>
<s>
In	O
addition	O
,	O
such	O
system	O
may	O
facilitate	O
AI-based	O
healthcare	O
research	O
with	O
images	O
by	O
offering	O
large	O
scale	O
text	B-Algorithm
mining	I-Algorithm
and	O
data	O
gathering	O
opportunities	O
from	O
standard	O
hospital	O
clinical	O
data	O
repositories	O
.	O
</s>
