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Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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CAD-ASTRA: a versatile and efficient mesh projector for X-ray tomography with the ASTRA-toolbox.

P Paramonov, N Francken, J Renders

|February 1, 2024

Summary

We introduce CAD-ASTRA, a versatile toolbox for rapid X-ray projection simulation from mesh models. This software accelerates applications in 3D X-ray computed tomography (XCT) and quality control, offering enhanced flexibility and performance.

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Area of Science:

Computational imaging
Scientific computing
3D rendering

Background:

Accurate X-ray projection simulation from mesh models is crucial for 3D X-ray computed tomography (XCT) and industrial inspection.
Existing tools often lack performance, flexibility for non-standard geometries, or easy integration with reconstruction software.

Purpose of the Study:

To present CAD-ASTRA, a versatile and high-performance toolbox for simulating X-ray projection data from mesh models.
To enhance compatibility with existing tools like the ASTRA toolbox for tomographic reconstruction.

Main Methods:

Developed three specialized GPU projectors using NVIDIA CUDA and OptiX for 3D rendering.
Implemented ray tracing for X-ray phase contrast simulation.
Enabled back-propagation of projective errors to mesh vertices for optimization routines.
Simulated polychromatic X-ray projections from heterogeneous objects with a finite focal spot size.

Main Results:

CAD-ASTRA provides fast and accurate X-ray projection simulation from mesh models.
The toolbox supports X-ray phase contrast simulations and error back-propagation.
Demonstrated wide applicability through use cases in CAD-based inspection, phase contrast experiments, and mesh reconstruction.

Conclusions:

CAD-ASTRA offers a flexible, high-performance solution for X-ray simulation from mesh data.
Its compatibility with the ASTRA toolbox and advanced features facilitate various applications in XCT and beyond.