<s>
Portable	B-Algorithm
magnetic	I-Algorithm
resonance	I-Algorithm
imaging	I-Algorithm
(	O
MRI	O
)	O
is	O
referred	O
to	O
the	O
imaging	B-Application
provided	O
by	O
an	O
MRI	O
scanner	O
that	O
has	O
mobility	O
and	O
portability	O
.	O
</s>
<s>
It	O
provides	O
MR	O
imaging	B-Application
to	O
the	O
patient	O
in-time	O
and	O
on-site	O
,	O
for	O
example	O
,	O
in	O
Intensive	O
care	O
unit	O
(	O
ICU	O
)	O
where	O
there	O
is	O
danger	O
associated	O
with	O
moving	O
the	O
patient	O
,	O
in	O
an	O
ambulance	B-Application
,	O
after	O
a	O
disaster	O
rescue	O
,	O
or	O
in	O
a	O
field	O
hospital/medical	O
tent	O
.	O
</s>
<s>
The	O
superconducting	O
magnet	O
is	O
one	O
of	O
the	O
main	O
sources	O
to	O
supply	O
a	O
homogeneous	O
main	O
static	O
magnetic	O
field	O
(	O
B0	O
)	O
for	O
MR	O
imaging	B-Application
.	O
</s>
<s>
The	O
electromagnet	O
is	O
another	O
source	O
to	O
supply	O
homogeneous	O
B0	O
for	O
MR	O
imaging	B-Application
.	O
</s>
<s>
The	O
scanner	O
has	O
a	O
220cm	O
diameter	O
and	O
is	O
sited	O
in	O
a	O
copper-mesh	O
enclosure	O
where	O
it	O
has	O
been	O
used	O
mostly	O
for	O
human	O
head	O
imaging	B-Application
,	O
although	O
the	O
system	O
was	O
originally	O
designed	O
to	O
perform	O
hyperpolarized	O
3He	O
lung	O
imaging	B-Application
with	O
subjects	O
in	O
both	O
upright	O
and	O
horizontal	O
orientations	O
.	O
</s>
<s>
The	O
imaging	B-Application
volume	O
is	O
a	O
cylinder	O
with	O
a	O
diameter	O
of	O
1	O
–	O
2cm	O
.	O
</s>
<s>
a	O
diameter	O
of	O
spherical	O
volume	O
(	O
DSV	O
)	O
of	O
20cm	O
for	O
head	O
imaging	B-Application
.	O
</s>
<s>
When	O
the	O
concept	O
of	O
body	O
dedication	O
is	O
applied	O
to	O
a	O
PMA-based	O
system	O
where	O
the	O
magnet	O
and	O
other	O
apparatus	O
are	O
built	O
around	O
a	O
targeted	O
body-part	O
under	O
imaging	B-Application
(	O
e.g.	O
</s>
<s>
Using	O
a	O
PMA	O
to	O
supply	O
a	O
homogeneous	O
B0	O
and	O
relying	O
on	O
linear	O
gradient	O
fields	O
supplied	O
by	O
gradient	O
coils	O
cannot	O
give	O
us	O
a	O
PMA	O
with	O
portability	O
and	O
a	O
relatively	O
large	O
imaging	B-Application
volume	O
simultaneously	O
.	O
</s>
<s>
Allowing	O
magnetic	O
field	O
that	O
has	O
non-linear	O
gradients	O
to	O
encode	O
the	O
signal	O
for	O
imaging	B-Application
leads	O
to	O
the	O
possibility	O
of	O
having	O
a	O
relatively	O
light	O
PMA	O
(	O
tens	O
to	O
hundreds	O
of	O
kgs	O
)	O
and	O
a	O
relatively	O
large	O
FoV	O
(	O
15	O
–	O
25	O
DSV	O
)	O
at	O
the	O
same	O
time	O
.	O
</s>
