Multi-spectral x-ray imaging using conventional equipment

A method for acquiring an image in an X-ray imaging apparatus, the method comprising:

• providing an X-ray source comprising a cathode and an anode, the X-ray source being configured to generate an X-ray beam;
• providing an X-ray detector configured to detect the X-ray beam after interaction with an imaged object, the X-ray beam having different spectra on an anode side and a cathode side caused by a heel effect when the X-ray source is in operation;
• and
• alternately exposing a pixel of the X-ray detector to the anode side and the cathode side of the X-ray beam by changing an imaging geometry by controlling actuators in concert with a timing of read-out activity, the actuators acting on at least one of the X-ray source, a patient examination table, and the detector.

A method for acquiring an image in an X-ray imaging apparatus, the method comprising:

• providing an X-ray source to generate an X-ray beam;
• providing an X-ray detector configured to detect the X-ray beam after interaction with an imaged object;
• and
• alternately exposing a pixel of the X-ray detector to the X-ray beam at first and second spectrum by moving a movable filter arranged between the X-ray source and the object so as to change at least locally a spectrum of the X-ray beam into the first and second spectrum.