
61-6 Medical, Biomedical, and Health
the current injection and the voltage measurement. As the same electrode pair is used for current injec-
tion
an
d
vo
ltage
me
asurement
in th
e
tw
o
el
ectrode
me
thod,
it ha
s
a co
ntact
im
pedance
pr
oblem
[8
]
. In
two-electrode systems, as the voltages are measured on the current-carrying electrodes, the voltage drop
(developed due to the high current magnitude) for the electrode contact impedance is also included with
th
e
me
asured
da
ta
. He
nce,
in th
e
tw
o-probe
me
thod,
th
e
el
ectrode
co
ntact
im
pedance
red
uces
th
e
sy
stem
accuracy. In the four-electrode method, the current injection and voltage measurement are done with ...