Biomedical Engineering Reference
In-Depth Information
(1) Estimate φ e (t) at the electrode in Fig. 8.5, where three current sources are propagating down a
cable at 300 mm/s . Assume dV
2 mm 3 , all distances are in mm , and all currents are in μA/mm 2 .
=
=300mm/s
60
e =1mS/cm
elec
50
1
-100
Y
X
12
7
5
0
(2) Derive the equations for Fig. 8.2.
Simulation Problems
(1) Modify the program in Ch. 4 simulation problem 2 to compute φ e (t) at x
=
1 . 5 cm and 0 . 2 cm
above the cable. Assume that σ e =
1 mS/cm .
(2) Show how the shape of φ e changes as the location of the recording electrode is change. Explain
the changes you see.
(3) Show how the shape of φ e changes as R i
is changed. Explain the changes you see.
(4) Program Fig. 8.2 assuming R e =
10 cm , R i =
100 cm , and I ion is described by the Hodgkin-
Huxely model.
(5) Use the program in problem 2 above to create a strength-duration curve for a stimulus at node 2
in Fig. 8.2.
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