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Gain correction for variable imaging geometry
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DOI：10.1002/mp.70560.png)
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Abstract
En 中文
Gain (flat-field) correction is a standard preprocessing step in X-ray imaging that compensates for detector fixed-pattern response, electronic offset, and spatial non-uniformity in incident fluence. Conventional correction relies on a geometry-matched air reference acquired at the same source-detector relative position as the clinical image. In variable-geometry systems, changes in source-detector distance (SDD) and relative source-detector rotation (SDR) alter the illumination field through inverse-square dilution and orientation-dependent anode heel shading, making geometry-matched reference acquisition impractical.
Keywords:
anode heel effect
flat-field calibration
gain correction
variable imaging geometry