Purpose
To determine the feasibility of using CCT and CMRI to print individual models of the aortic root complex for aortic annulus measurement.
Methods and Materials
Retrospective study on 20 patients who underwent aortic valve replacement with available records of pre-surgery annulus assessment by CCT and CMRI and of intra-operative assessment by Hegar dilators.
The imaging DICOM data were loaded into an imaging processing software (OsirixMD) to obtain Standard Tessellation Language (STL) files that were exported to a model-editing software (Meshmixer®) and edited to retain only the aortic root from the left ventricular outflow tract to the sinotubular junction.
40 aortic annuli were printed using a fusion deposition modelling printer (Ultimaker...
Results
There were no significant differences when compared the annulus dimensions measured by 3D models derived from CCT (p=0.33) and CMRI (p=0.44) to the surgical reference of intra-operative sizing.
Valve sizing for CoreValve®by intra-operative measurement had the same good agreement with 3D model-based measurement,
with a 95% match rate; for SAPIEN XT®the agreement was slightly better (95%) for CMR-derived model than for CCT (90%).
Time and cost per model were: STL creation ~15min; printing time ~30min; post-processing ~2min; material cost <1€.
Conclusion
The 3D models performed well when compared to the surgical reference of intraoperative sizing.
This approach may be a reliable,
not expensive,
patient-specific pre-operative planning opportunity.
References
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Cardiac 3D Printing and its Future Directions.
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GGomez-Ciriza,
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Potential of 3D-printed models in planning structural interventional procedures.
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Standardized imaging for aortic annular sizing: implications for transcatheter valve...
Personal Information
Marco Gatti,
MD
[email protected]
Department of Surgical Sciences,
Radiology Unit,
University of Turin,
Italy.
Via Genova 3,
10126 Torino
tel: +39 011 6336622
fax: +39 011 6960310
