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US 10,539,692 B2Granted
Radiation imaging apparatus and radiation imaging system
AssigneeCanon Kabushiki Kaisha
InventorAsato Kosuge
Life of this patent
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Abstract
A radiation imaging apparatus includes a control unit that controls a radiation image capturing operation performed by a pixel array based on determination of start of radiation irradiation based on comparison between a measured value that is an amount of change with respect to a reference value and acquired using a detection unit for detecting irradiation of the pixel array with radiation and a threshold value in one of positive and negative with respect to the reference value. The control unit changes the threshold value within a predetermined range and according to the measured value in other range of the positive and the negative.
Claims19
A radiation imaging apparatus comprising:
- a pixel array in which a plurality of pixels is arrayed to capture a radiation image;
- a detection unit configured to detect irradiation of the pixel array with radiation to acquire measured values, wherein the measured values relative to a reference value include positive values and negative values;
- and
- a control unit configured to control a radiation image capturing operation performed by the pixel array according to determination of start of radiation irradiation,
- wherein the determination is based on comparison between the measured values relative to the reference value and a threshold value that is either in a positive or negative range, and
- wherein the control unit changes the threshold value, to change the threshold value within a predetermined range according to measured values in a range opposite the positive or negative range of the threshold value among the measured values, according to determination of whether to change the threshold value based on comparison between a value calculated from a current threshold value based on the measured values in the opposite range and at least one of an upper limit and a lower limit of the predetermined range during a time period between initialization of a first row in the plurality of pixels in the pixel array and initialization of a row next to the first tow in course of an initialization operation for initializing the plurality of pixels in the pixel array on a row basis.
3 more elements
A radiation imaging apparatus comprising:
- a pixel array in which a plurality of pixels is arrayed to capture a radiation image;
- a detection unit configured to detect irradiation of the pixel array with radiation to acquire measured values, wherein the measured values relative to a reference value include positive values and negative values;
- and
- a control unit configured to control a radiation image capturing operation performed by the pixel array according to determination of start of radiation irradiation,
- wherein the determination is based on comparison between the measured values relative to the reference value and a threshold value that is either in a positive or negative range,
- wherein the control unit changes the threshold value, to change the threshold value within a predetermined range according to measured values in only a range opposite the positive or negative range of the threshold value among the measured values, according to determination of whether to change the threshold value based on comparison between a value calculated from a current threshold value based on the measured values in only the opposite range and at least one of an upper limit and a lower limit of the predetermined range during a time period between initialization of a first row in the plurality of pixels in the pixel array and initialization of a row next to the first row in course of an initialization operation for initializing the plurality of pixels in the pixel array on a row basis.
3 more elements
A radiation imaging apparatus comprising:
- a pixel array in which a plurality of pixels is arrayed to capture a radiation image;
- a detection unit configured to detect irradiation of the pixel array with radiation to acquire measured values, wherein the measured values relative to a reference value include positive values and negative values;
- and
- a control unit configured to control a radiation image capturing operation performed by the pixel array according to determination of start of radiation irradiation,
- wherein the determination is based on comparison between the measured values relative to the reference value and a threshold value that is either in a positive or negative range,
- wherein the control unit changes the threshold value, to change the threshold value within a predetermined range according to the measured values excluding values in the positive or negative range, according to determination of whether to change the threshold value based on comparison between a value calculated from a current threshold value based on the measured values in the opposite range and at least one of an upper limit and a lower limit of the predetermined range during a time period between initialization of a first row in the plurality of pixels in the pixel array and initialization of a row next to the first row in course of an initialization operation for initializing the plurality of pixels in the pixel array on a row basis.
3 more elements
Dependencies are inferred from the claim text.