<s>
Oral	B-Algorithm
cholecystography	I-Algorithm
is	O
a	O
radiological	O
procedure	O
used	O
to	O
visualize	O
the	O
gallbladder	O
and	O
biliary	O
channels	O
,	O
developed	O
in	O
1924	O
by	O
American	O
surgeons	O
Evarts	O
Ambrose	O
Graham	O
and	O
Warren	O
Henry	O
Cole	O
.	O
</s>
<s>
If	O
needed	O
,	O
intravenous	O
cholecystography	B-Algorithm
and	O
cholangiography	O
may	O
be	O
done	O
.	O
</s>
<s>
Current	O
medical	O
practice	O
prefers	O
ultrasound	O
and	O
CT	O
over	O
oral	B-Algorithm
cholecystography	I-Algorithm
.	O
</s>
<s>
Failure	O
of	O
gallbladder	O
visualisation	O
during	O
oral	B-Algorithm
cholecystography	I-Algorithm
when	O
abnormal	O
liver	O
function	O
returns	O
to	O
normal	O
,	O
or	O
there	O
is	O
mild	O
to	O
moderate	O
liver	O
disease	O
,	O
maybe	O
due	O
to	O
extrahepatic	O
(	O
outside	O
the	O
liver	O
)	O
causes	O
.	O
</s>
<s>
Oral	B-Algorithm
cholecystography	I-Algorithm
can	O
have	O
better	O
sensitivity	O
and	O
specificity	O
in	O
diagnosing	O
acute	O
and	O
chronic	O
gallbladder	O
disease	O
than	O
ultrasound	O
.	O
</s>
