Breast phantom for comparison X-ray and polarimetric optical tomography imaging

Area of Science:

• Biomedical Imaging
• Medical Physics
• Optical Tomography

Background:

• Breast phantoms are crucial for developing and validating medical imaging techniques.
• INTRALIPID™ is used to mimic breast tissue optical properties but has limitations in X-ray imaging.
• Accurate characterization of phantom inclusions is essential for reliable imaging system assessment.

Purpose of the Study:

• To evaluate the capabilities of X-ray computed tomography (CT) and polarimetric optical tomography (POT) for imaging breast phantoms.
• To compare the accuracy of inclusion localization and density differentiation between X-ray CT and POT.
• To assess the suitability of INTRALIPID™ as a component in breast phantoms for multimodal imaging research.

Main Methods:

• A breast phantom was constructed using paraffin and varying concentrations of INTRALIPID™.
• The phantom was imaged using conventional X-ray computed tomography.
• The same phantom was imaged using polarimetric optical tomography.

Main Results:

• X-ray CT successfully identified the location of INTRALIPID™ inclusions within the paraffin phantom.
• X-ray CT could not differentiate between different concentrations of INTRALIPID™ within the inclusions.
• Polarimetric optical tomography accurately distinguished between 0%, 10%, and 20% INTRALIPID™ concentrations.
• Polarimetric optical tomography exhibited lower accuracy in precisely locating the inclusions compared to X-ray CT.

Conclusions:

• X-ray CT is effective for structural localization of inclusions in breast phantoms.
• Polarimetric optical tomography excels at differentiating material properties (e.g., INTRALIPID™ concentrations) but has spatial resolution limitations.
• A multimodal approach combining X-ray CT and POT may offer comprehensive characterization of breast phantoms for advanced imaging research.