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Proton-induced x-ray fluorescence CT imaging.

Magdalena Bazalova-Carter1, Moiz Ahmad2, Taeko Matsuura3

  • 1Department of Radiation Oncology, Stanford University, Stanford, California 94305-5847 and Global Station for Quantum Medical Science and Engineering, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo 060-8648, Japan.

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|February 6, 2015
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Summary
This summary is machine-generated.

Proton-induced X-ray Fluorescence CT (pXFCT) successfully imaged gold solutions in a phantom. This novel imaging technique shows feasibility for small animal studies, with results validated by Monte Carlo simulations.

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Area of Science:

  • Medical Imaging
  • Nuclear Physics
  • Biomedical Engineering

Background:

  • Proton-induced X-ray Fluorescence (pXRF) is a sensitive elemental analysis technique.
  • X-ray Fluorescence Computed Tomography (XFCT) offers elemental-specific imaging.
  • Combining pXRF with CT (pXFCT) could provide novel contrast mechanisms for biomedical imaging.

Purpose of the Study:

  • To demonstrate the feasibility of proton-induced X-ray Fluorescence Computed Tomography (pXFCT) for imaging gold.
  • To validate experimental pXFCT results using Monte Carlo (MC) simulations.
  • To assess pXFCT imaging of gold concentrations relevant to small animal studies.

Main Methods:

  • Measured proton-induced gold X-ray fluorescence (pXRF) across varying gold concentrations (0-5%).
  • Acquired pXFCT data using a 220 MeV proton beam on a water phantom with gold solutions.
  • Reconstructed pXFCT images using filtered back projection and compared with MC simulations (TOPAS code).

Main Results:

  • A strong linear correlation (R² > 0.99) was observed between pXRF intensity and gold concentration in both experimental and simulated data.
  • Gold vials were clearly visualized in both experimental and simulated pXFCT images.
  • The 3% gold vial was detectable with a contrast-to-noise ratio (CNR) of 5.8 experimentally and 11.5 in simulations; higher concentrations showed underestimation due to attenuation.

Conclusions:

  • Proton-induced X-ray Fluorescence CT (pXFCT) imaging of gold solutions (3-5%) in a small animal-sized phantom was successfully demonstrated.
  • The study confirms the feasibility of pXFCT for elemental imaging in biological contexts.
  • Experimental and MC simulation results align, validating the pXFCT methodology.