Abstract
Purpose: To evaluate the feasibility of aortic stentgraft micromovement
detection using digital roentgen stereophotogrammetric analysis on
plane film radiographs. Material and Methods: An aortic stentgraft
used for demonstration purposes was marked with 10 tantalum markers
of 0.8 mm in diameter. The stentgraft was placed on a Plexiglas phantom
with 5 tantalum markers of 1 mm in diameter simulating a fixed segment
needed for mathematical analysis. In a subsequent step, the stentgraft
was placed onto an orthopaedic spine model to simulate in vivo conditions
in a next step. Two radiographs taken simultaneously from different
angles were used for simulating different stentgraft movement, e.g.
translation, angulation, aortic pulsation and migration in the spine
model. Movement of the stentgraft markers was analysed using a commercially
available digital RSA setup (UmRSA(R) 4.1, RSA Biomedical, Umea,
Sweden). Results: Our study shows the feasibility of measuring aortic
stentgraft movement and changes in stentgraft shape in the submillimeter
range using digital roentgen stereophotogrammetric analysis. Translation
along the 3 cardinal axes, change in stentgraft shape, simulation
of aortic pulsation and simulation of in vivo conditions could be
described precisely. Conclusion: Aortic stentgraft movement detection
using digital roentgen stereophotogrammetric analysis on plane film
radiographs is a very promising, precise method
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