Geometric calibration for a dual tube/detector micro-CT system

Area of Science:

• Medical Imaging
• Physics
• Engineering

Background:

• Dual tube/detector micro-computed tomography (micro-CT) offers enhanced temporal resolution and material contrast for small animal studies.
• Precise geometric calibration is critical for combining projection data from multiple imaging chains in micro-CT.

Purpose of the Study:

• To develop and validate a geometric calibration technique for dual tube/detector micro-CT systems.
• To enable the accurate combination of projection data from independent imaging chains into a single reconstructed image.

Main Methods:

• Utilized a phantom with regularly spaced metallic beads rotated within the dual micro-CT system.
• Employed analytical methods and nonlinear optimization to estimate individual imaging chain geometries.
• Derived cone beam projection matrices and determined inter-chain transformations for data fusion.

Main Results:

• The proposed geometric calibration technique demonstrated accuracy and robustness in simulations and experimental data.
• Successfully combined projection data from both imaging chains, producing artifact-free reconstructed images.
• Validated the technique's ability to precisely align dual micro-CT imaging geometries.

Conclusions:

• The presented geometric calibration method is effective for dual tube/detector micro-CT systems.
• This technique facilitates improved image quality and data integration in small animal micro-CT imaging.
• Accurate calibration is key to unlocking the full potential of advanced micro-CT configurations.