61-11Sensors for Electrical Impedance Tomography
In projection two (Figure 61.10b) another set of 13 dierential voltage data are collected across the 13
vo
ltage
el
ectrode
pa
irs
ob
tained
by co
mbining
th
e
13 vo
ltage
el
ectrodes
(E
V
: E
3
, E
4
, E
5
, E
6
, E
7
, E
8
, E
9
, E
10
,
E
11
, E
12
, E
13
, E
14
, and E
15
) with the voltage reference electrodes (E
VR
= E
1
). In this projection, the current
in
jection
is ma
de
by co
nguring
th
e
el
ectrode
4 (E
4
) as the positive current electrode and electrodes 16
(E
16
) as the current reference (Figure 61.10b). With this current injection, the 13 dierential potentials
(V
d
: V
1
, V
2
, V
3
, … V
13
) are measured successively across the 13 voltage electrode pairs obtained by com-
bining
th
e
13 vo
ltage
el
ectrodes
(E
V
: E
2
, E
3
, E
5
, E
6
, E
7
, E ...