Biomedical Engineering Reference
In-Depth Information
polariscope design. This map indicates the correlation among
observed color (RGB), magnitude of retardation
Re and direction of
the stress
R
. From the matching the observed color with the color
map Re and
R
can be deduced. Then the corresponding intensity
can be calculated with equation (4.36) and then stress magnitude is
calculated.
0
265
530
Retardation
Re
[nm]
Figure 4.18
Color map calculated from equation 4.36 for RGB for
retardations within the model below 530
nm and stress
direction below 180
°
. See also Color Insert.
This method is extensible to real-time stress analysis and provides
information for evaluating the medical instruments performance
in terms of stress magnitude and direction, computational luid
dynamics validation for hemodynamic studies, and surgical skills
evaluation.
[kP
a
]
[deg]
250
180
Q
200
135
150
90
100
50
45
a)
b)
0
0
Figure 4.19
Simultaneous measurements of stress magnitude (a) and
direction (b) for the single-layer model shown in Fig. 4.17. See
also Color Insert.
4.10
Three-Dimensional Visualization of Stress
Three-dimensional stress visualization is necessary in endovascular
surgery simulation for observation and measurement of stress
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