Preliminary experience with selective laser sintering models of the human temporal bone

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Anatomical Modeling

Background:

• Accurate three-dimensional (3D) models of complex anatomical structures are crucial for surgical planning and education.
• Computed tomography (CT) provides detailed cross-sectional imaging data.
• Selective laser sintering (SLS) is an additive manufacturing technique capable of producing complex geometries.

Purpose of the Study:

• To evaluate the accuracy of 3D temporal bone models fabricated using CT data and SLS.
• To compare the accuracy of models generated from different CT scan planes.

Main Methods:

• Thin-section CT scans of a human cadaveric temporal bone were acquired.
• CT data were processed to generate a toggle point format.
• Polycarbonate models were fabricated using SLS with specific machine parameters.
• The fabricated models were scanned and compared to the original CT data for accuracy assessment.

Main Results:

• SLS successfully generated 3D models of the human temporal bone with high anatomic accuracy.
• Model distortion was observed, primarily along the Z-axis (shortening by 0.67) and up to 20% in the XY plane.
• Accuracy varied depending on the initial CT scan plane.
• Incomplete sintering of polycarbonate material led to intermediate densities in CT images.

Conclusions:

• SLS is a viable technique for creating accurate 3D models of intricate anatomical structures like the temporal bone.
• Further research is needed to optimize SLS materials and parameters for enhanced accuracy in high-resolution anatomical model manufacturing.