Radiation imaging apparatus and radiation imaging system
AssigneeCanon Kabushiki Kaisha
InventorsKeigo Yokoyama, Tadao Endo, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka
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Abstract
The invention intends to be able to perform a gain correction fully adequately. Hence, at the time of radiographing an object, a gain correction of the object image is performed based on a gain correction image (XRc1) derived by performing a light reset. On the other hand, at the time of radiographing an object, when a light reset is not performed, a gain correction of the object image is performed based on a gain correction image (XRc2) derived without performing the light reset.
Claims11
A radiation imaging apparatus for deriving a corrected radiation image of an object based on radiation emitted from a radiation source, comprising at least a processor and memory and further comprising:
- a sensor unit for deriving a radiation image of the object, containing pixels which are two-dimensionally arranged, wherein each pixel has a conversion element for converting radiation into an electrical signal;
- a light source that emits light of a waveband perceptible by the conversion elements to the conversion elements;
- and
- a correction unit that corrects the radiation image of the object derived by said sensor unit based on a correction signal for correcting different gains for each of said pixels, wherein the correction signal comprises a first correction signal derived by said sensor unit when said sensor unit is irradiated by radiation with no object existing between the radiation source and said sensor unit after said sensor unit is irradiated by the light from said light source, and said correction unit corrects the radiation image of an object derived by said sensor unit radiated by the light from said light source before the operation based on the first correction signal that was derived by said sensor unit radiated by the light from said light source before the operation.
Dependencies are inferred from the claim text.