Method for gain calibration of an X-ray imaging system, and X-ray imaging system
AssigneeSiemens Aktiengesellschaft
InventorMathias Hörnig
Life of this patent
Estimating the term…
Abstract
In order to increase the useful surface of an X-ray detector, in particular a flat image detector, a method is provided for gain calibration of an X-ray imaging system with a digital X-ray detector including an active matrix having pixel readout units. Pixels are read out from the pixel readout units, and a brightness drop below a defined threshold is determined for the read out pixels by an image processing unit. The pixel readout units having a brightness drop below the defined threshold are specified with regard to a cause of the brightness drop. Further, as a function of the specification, it is defined for which image raw values, subsequently read out from the affected pixel readout units, a gain correction is to be undertaken.
Claims22
A method for gain calibration of an X-ray imaging system including a digital X-ray detector having an active matrix including pixel readout units, the method comprising:
- reading out pixels from the pixel readout units;
- determining a brightness drop below a defined threshold for the read out pixels, using an image processing unit;
- specifying the pixel readout units having a brightness drop below the defined threshold with regard to a cause of the brightness drop;
- and
- determining, as a function of the specification, for which image raw values, subsequently read out from the specified pixel readout units, to undertake a gain correction.
An X-ray imaging system, comprising:
- a digital X-ray detector having an active matrix including a multiplicity of pixel readout units having raw image values;
- and
- an image processing unit for storing, processing and correcting raw X-ray values, and for determining a brightness drop of pixels read out from pixel readout units below a defined threshold, wherein pixel readout units affected by the brightness drop are specifiable with regard to a cause of the brightness drop, and a gain correction is adapted to be carried out as a function of the specification values in conjunction with raw image values subsequently read out from the affected pixel readout units.
Dependencies are inferred from the claim text.