A web-based tool to parametrically generate the aortic valve leaflets. Access the tool here.
X, Y and Z coordinates were obtained at 7 locations: the point of coaptation of the leaflets (P0), attachment points at the level of the sinotubular junction (P1-P3) and the basal attachment points for the leaflets (P4-P6). These coordinates are easily measured (in about 5 minutes) by imagers skilled in traditional TAVR measurements.
Curves are interpolated through these landmark points and the parametric geometry of the leaflets is generated with a consistent thickness of 0.4 mm (average thickness of uncalcified leaflets is ~ 0.41 mm). The leaflet shape could then be manipulated using sliders to ensure that they properly intersected with the segmented calcified portions of the leaflets. A set of primary controls adjusts the landmark point locations and the free leaflet edges. They are used to align the parametrically generated leaflets with the aortic sinus. A set of secondary controls adjusts isocurves lying on the generated leaflets and are used to align the leaflets with the mineral deposits.
- A .csv file containing the 7 fiduciary points as outlined above.
The file should be formatted as follows:
P0, -9.462358, -0.20132, 1669.094232
P1, -3.573614, -9.771409, 1674.504326
P2...
P3...
P4...
P5...
P6...
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A .stl file of the aortic sinus
-
A .stl file of the calcified deposits
Use the "Markers" module to extract the points
Use the "Segment Editor" module. Once you are happy with the segmentation (either done manually, through thresholding, or a combination of both), export it with RAS coordinates.
Please cite our paper if you end up using out tool:
Pre-procedural Fit-testing of Transcatheter Aortic Valve Replacement (TAVR) Valves Using Parametric Modeling and 3D Printing
A Hosny, J Dilley, T Kelil, M Mathur, M Dean, JC Weaver & B Ripley
Journal of Cardiovascular Computed Tomography 2018
Watch this quick movie or check out these instructions. Email me .