<s>
Magnetic	B-Algorithm
Field	I-Algorithm
Imaging	I-Algorithm
(	O
MFI	O
)	O
is	O
a	O
non-invasive	O
and	O
side-effect-free	O
cardiac	O
diagnostic	O
method	O
.	O
</s>
<s>
The	O
electric	O
signals	O
are	O
known	O
from	O
the	O
ECG	B-Application
.	O
</s>
<s>
The	O
differences	O
in	O
the	O
electric	O
potentials	O
,	O
that	O
are	O
recorded	O
by	O
the	O
ECG	B-Application
,	O
are	O
directly	O
depending	O
on	O
the	O
inhomogeneity	O
and	O
geometry	O
of	O
the	O
thorax	O
,	O
the	O
magnetic	O
signals	O
outside	O
of	O
the	O
thorax	O
depend	O
primarily	O
on	O
the	O
intracellular	O
currents	O
of	O
the	O
cardiac	O
tissue	O
and	O
only	O
secondarily	O
on	O
the	O
secondary	O
currents	O
generating	O
the	O
electric	O
signal	O
.	O
</s>
<s>
As	O
sensors	O
the	O
most	O
sensitive	O
magnetic	O
sensors	O
presently	O
available	O
,	O
SQUIDs	B-Protocol
(	O
superconducting	O
quantum	O
interference	O
devices	O
)	O
,	O
which	O
are	O
cooled	O
down	O
to	O
4	O
K	O
(	O
-269	O
°C	O
)	O
with	O
liquid	O
helium	O
,	O
are	O
used	O
to	O
acquire	O
the	O
signals	O
.	O
</s>
<s>
The	O
main	O
fields	O
of	O
use	O
are	O
the	O
risk	O
stratification	O
of	O
ventricular	B-Application
tachycardia	I-Application
(	O
VT	O
)	O
and	O
the	O
detection	O
of	O
stress	O
induced	O
ischemia	O
.	O
</s>
