Low-dose phase contrast tomography with conventional x-ray sources.

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Physics

Background:

• X-ray phase contrast imaging (XPCi) offers enhanced sensitivity for weakly attenuating materials compared to conventional radiography.
• Tomographic XPCi extends phase contrast imaging to volumetric analysis, enabling 3D reconstruction of sample properties.

Purpose of the Study:

• To present the first tomographic edge illumination (EI) XPCi images acquired using a conventional X-ray source.
• To evaluate the feasibility of EI XPCi at dose levels suitable for preclinical small animal imaging.

Main Methods:

• Laboratory-based EI XPCi setup operated in tomography mode.
• Imaging of a biological sample and a custom-built phantom.
• Reconstruction of tomographic phase shift and attenuation maps, with analysis of signal-to-noise ratio and quantitative accuracy.
• Dosimetry measurements using thermoluminescence devices.

Main Results:

• Tomographic EI XPCi provides superior 3D imaging results for weakly attenuating samples compared to attenuation-based methods.
• Demonstrated the feasibility of low-dose tomographic EI XPCi.
• Experimental results showed quantitative accuracy within the limitations of polychromatic X-ray sources.

Conclusions:

• Tomographic EI XPCi is dose-efficient and compatible with conventional X-ray sources.
• The technique shows significant potential as a routine imaging tool for biomedical samples.
• EI XPCi in 3D is a promising advancement for biological and medical imaging.