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A tilted grating interferometer for full vector field differential x-ray phase contrast tomography.

Simon Rutishauser1, Tilman Donath, Christian David

  • 1Paul Scherrer Institut, Villigen PSI, Switzerland. simon.rutishauser@psi.ch

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This study introduces a novel x-ray imaging setup that captures full 2D phase-gradient data. The technique reconstructs refractive index and its gradient components, advancing medical and materials imaging.

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Area of Science:

  • Medical Imaging
  • Materials Science
  • Physics

Background:

  • X-ray imaging traditionally relies on absorption contrast, limiting its sensitivity to soft tissues and materials.
  • Differential phase-contrast (DPC) x-ray imaging offers enhanced sensitivity by detecting phase shifts, but full 2D gradient information is challenging to acquire.
  • Existing DPC methods often require complex setups or specialized sources, hindering broader application.

Purpose of the Study:

  • To develop and demonstrate a simplified setup for differential x-ray phase-contrast imaging and tomography that measures the full 2D phase-gradient information.
  • To enable direct reconstruction of the refractive index distribution and its gradient components (x, y, z) from projection data.
  • To show the versatility of the method for various x-ray sources and imaging modalities.

Main Methods:

  • Utilized a 1D x-ray grating interferometer with grating structures tilted relative to the sample rotation axis.
  • Combined differential phase images from opposing tomography projections to extract both components of the phase gradient vector.
  • Reconstructed the refractive index and its gradient components directly from recorded projection data.

Main Results:

  • Successfully measured the full 2D phase-gradient information using the tilted grating interferometer setup.
  • Demonstrated direct reconstruction of the refractive index distribution and its x, y, and z gradient components.
  • Validated the method with phantom and rat brain samples using synchrotron radiation.

Conclusions:

  • The proposed setup provides a straightforward method for acquiring full 2D differential x-ray phase-gradient information.
  • This technique allows for direct reconstruction of material properties and their spatial variations, enhancing imaging capabilities.
  • The method's compatibility with conventional x-ray tubes, analyzer-based imaging, and neutron imaging broadens its potential applications in diverse scientific fields.