Spatial resolution characterization of a X-ray microCT system.

Area of Science:

• Medical imaging physics
• Materials science and engineering

Background:

• X-ray micro-computed tomography (micro-CT) is crucial for non-destructive 3D imaging.
• Accurate spatial resolution is vital for detailed analysis in micro-CT.
• Characterizing spatial resolution under various conditions is essential for optimizing performance.

Purpose of the Study:

• To experimentally evaluate the spatial resolution of a commercial X-ray micro-CT scanner.
• To determine the modulation transfer function (MTF) as a measure of spatial resolution.
• To investigate the influence of X-ray tube parameters and pixel size on spatial resolution.

Main Methods:

• Measured the full modulation transfer function (MTF) of the micro-CT system.
• Determined spatial frequencies corresponding to 50% contrast loss.
• Varied X-ray tube parameters and magnification-dependent pixel sizes during measurements.

Main Results:

• The modulation transfer function (MTF) was fully characterized.
• Spatial resolution was found to be dependent on X-ray tube parameters and pixel size.
• Significant impact of focal spot enlargement on achievable spatial resolution was demonstrated.

Conclusions:

• Experimental characterization provides a robust assessment of micro-CT spatial resolution.
• Focal spot size is a critical parameter influencing spatial resolution.
• Results guide the selection of optimal X-ray tube parameters for specific micro-CT applications.