Key result
3D photoelastic stress imaging maps vascular phantom pressure changes with down to ~3% error.
Why the study?
The photoelastic effect is used for stress measurement during endovascular surgery simulation, but its potential for intravascular tools evaluation needs extension.
Three-dimensional photoelastic stress analysis in vasculature phantoms enables accurate visualization and comparison of mechanical stress produced by intravascular tools versus normal blood pressure.
Supports phantom-based stress mapping for device testing; leaves open clinical translation and in vivo validation.
BACKGROUND: The photoelastic effect is used for stress measurement during endovascular surgery simulation for quantitative evaluation of catheter trajectory in in vitro environments. By extending the capabilities of this sensing technology, its potential for intravascular tools evaluation will increase. METHODS: In this research the error introduced by stress direction on magnitude measurements was studied, then stress measurements were made in the phantom modelling of a saccular aneurysm with bleb. To visualize three-dimensionally the stress field changes produced by a guide wire in a phantom wall, a scanner and an algorithm relying on maximum likelihood-expectation maximization are proposed. Three-dimensional fields at different pressure level were compared with the stress field surrounding the guide wire. RESULTS: The maximum error in stress magnitude measurements due to stress direction was 2.52%. Stress local maximum was detected in the bleb phantom before rupture. Three-dimensional visualization was obtained in vasculature phantom with average errors of 10.73%, 4.55%, 3.18% for inner pressures of 80, 120, 160 mmHg, respectively. Stress measurement in the neighbourhood of the guide wire is equivalent to applying an inner pressure of 120 mmHg. CONCLUSIONS: For the presented polariscope, the weak influence of stress direction in magnitude measurements was confirmed. In vasculature phantoms, the three-dimensional visualization of stress eliminated birefringence visualization distortion and enabled more comprehensive comparison of stress produced by intravascular tools with stress produced by normal blood pressure.
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Matsushima et al. (2010) studied Saccular aneurysm with bleb (in vitro phantom model). Three-dimensional visualization of photoelastic stress was evaluated on Error in stress magnitude measurements and three-dimensional visualization. Three-dimensional visualization of photoelastic stress in vasculature phantoms yielded average errors of 10.73%, 4.55%, and 3.18% for inner pressures of 80, 120, and 160 mmHg, respectively.
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