<s>
Cardiac	B-Algorithm
PET	I-Algorithm
(	O
or	O
cardiac	B-Algorithm
positron	I-Algorithm
emission	I-Algorithm
tomography	I-Algorithm
)	O
is	O
a	O
form	O
of	O
diagnostic	B-Application
imaging	I-Application
in	O
which	O
the	O
presence	O
of	O
heart	O
disease	O
is	O
evaluated	O
using	O
a	O
PET	B-Application
scanner	I-Application
.	O
</s>
<s>
Commonly	O
used	O
radiotracers	O
are	O
Rubidium-82	B-Algorithm
,	O
Nitrogen-13	O
ammonia	O
and	O
Oxygen-15	O
water	O
.	O
</s>
<s>
Rubidium-82	B-Algorithm
is	O
produced	O
from	O
the	O
decay	O
of	O
Strontium-82	O
through	O
electron	O
capture	O
in	O
a	O
generator	O
.	O
</s>
<s>
Strontium-82	O
has	O
a	O
half-life	O
of	O
25.5	O
days	O
while	O
Rubidium-82	B-Algorithm
has	O
a	O
half-life	O
of	O
76	O
seconds	O
.	O
</s>
<s>
Heart	O
muscles	O
can	O
take	O
up	O
Rubidium-82	B-Algorithm
efficiently	O
through	O
sodium	O
–	O
potassium	O
pump	O
.	O
</s>
<s>
Compared	O
with	O
Technetium-99m	O
,	O
Rubidium-82	B-Algorithm
has	O
higher	O
uptake	O
by	O
the	O
heart	O
muscles	O
.	O
</s>
<s>
However	O
,	O
Rubidium-82	B-Algorithm
has	O
lower	O
uptake	O
by	O
heart	O
muscles	O
when	O
compared	O
to	O
N-13	O
ammonia	O
.	O
</s>
<s>
But	O
the	O
positron	O
energy	O
emitted	O
by	O
Rubidium-82	B-Algorithm
is	O
higher	O
than	O
N-13	O
ammonia	O
and	O
Fluorodeoxyglucose	B-Application
(	O
18F	O
)	O
.	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
the	O
positron	O
range	O
(	O
the	O
distance	O
travelled	O
by	O
a	O
positron	O
from	O
its	O
production	O
site	O
until	O
its	O
annihilation	O
with	O
an	O
electron	O
)	O
is	O
longer	O
when	O
compared	O
to	O
other	O
radiopharmaceuticals	O
,	O
causing	O
reduced	O
image	B-Algorithm
resolution	I-Algorithm
.	O
</s>
<s>
Myocardium	O
has	O
higher	O
uptake	O
for	O
N-13	O
ammonia	O
when	O
compared	O
to	O
Rubidium-82	B-Algorithm
,	O
thus	O
useful	O
for	O
myocardial	O
perfusion	O
imaging	O
.	O
</s>
