Monochromatic attenuation contrast image generation by using phase contrast CT
AssigneeKoninklijke Philips N.V.
InventorsThomas Koehler, Ewald Roessl, Dirk Schafer
Life of this patent
Estimating the term…
Abstract
The present invention relates to a method and apparatus for X-ray phase contrast imaging. The method comprises the following steps: from the measured phase gradient and overall attenuation information, an electron density is computed; the contribution pc of the Compton scattering to the overall attenuation is estimated from the electron density; the contribution pp of the photo-electric absorption to the overall attenuation is estimated from the overall attenuation and the contribution pc; the values pc and pp are used to reconstruct a Compton image and a photo-electric image; by linear combination of these two images, a monochromatic image at a desired energy is obtained.
Claims14
A method for generating an X-ray image, comprising the steps of:
- receiving a phase gradient and an overall attenuation information both derived from a phase-contrast image;
- computing an electron density image based on the phase gradient information as recorded in the phase-contrast image;
- estimating, from the computed electron-density, a contribution, pC, of the Compton scattering to the overall attenuation information as recorded in the phase-contrast image;
- estimating the contribution, pp, of the photo-electric absorption to the overall attenuation information as recorded in the phase-contrast image;
- and
- for an energy specification, combining pC and pp into a mono-chromatic image.
Dependencies are inferred from the claim text.