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Copper and tin pre-filters significantly reduce noise and artifacts in Medipix All Resolution Scanner (MARS) photon counting CT (PCCT) imaging. These filters enhance contrast performance, particularly for tantalum oxide nanoparticles (TaOxNPs), improving image quality and potential clinical applications.

Keywords:
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Area of Science:

  • Medical Imaging Physics
  • Photon Counting CT Technology
  • Materials Science in Medical Imaging

Background:

  • Medipix All Resolution Scanner (MARS) utilizes photon counting CT (PCCT) for advanced imaging.
  • Pre-filtration is crucial for optimizing X-ray source characteristics and image quality.
  • Assessing metal artifact reduction (MAR) and contrast performance (CP) is vital for clinical translation.

Purpose of the Study:

  • To empirically map the X-ray source spectrum of a MARS-PCCT system with copper (Cu) and tin (Sn) pre-filters.
  • To evaluate the metal artifact reduction (MAR) capabilities of these pre-filters.
  • To measure the impact of pre-filtration on the contrast performance (CP) of iopromide and tantalum oxide nanoparticles (TaOxNPs).

Main Methods:

  • Empirical mapping of the MARS-PCCT X-ray source with varying thicknesses of Cu and Sn filters.
  • Scanning a phantom containing water, lipid, iopromide, TaOxNPs, and metal under different pre-filtration conditions.
  • Quantification of MAR and CP using insert noise, signal, contrast-to-pooled-noise ratio (CPNR), and fast Fourier transform artifact metric (FFTAM).

Main Results:

  • Thick Cu and Sn filters shifted the mean X-ray source energy significantly (19.2 keV and 23.4 keV, respectively).
  • Thick filtration (2.1 mm Cu, 0.6 mm Sn) reduced noise by up to 74% and artifacts by up to 71%.
  • Pre-filtration improved CPNR, especially for TaOxNPs (up to 61%), despite a contrast reduction for both iopromide and TaOxNPs.

Conclusions:

  • Empirical source mapping with pre-filters provides critical data for photon flux distribution and detector artifacts in MARS-PCCT.
  • Findings offer insights for energy binning strategies in material decomposition and guide clinical MAR development.
  • Tantalum oxide nanoparticles demonstrate greater compatibility with spectral shaping compared to iopromide.