Radiographic image capturing apparatus and radiographic image capturing system
A radiographic image capturing apparatus and a radiographic image capturing system are shown. According to one aspect, the radiographic image capturing apparatus includes the following. A scanning driving unit applies voltage to scanning lines. A switching element releases electric charge upon application of the ON-state voltage. A readout circuit converts the electric charge into image data and reads the data. A controller reads the image data. The detecting unit detects start and end of irradiation based on a change in a signal. The controller determines whether a standby time from end of readout to start of readout in next capturing is changed with reference to a first period and a second period. The first period ranges from end of readout to detection of start of irradiation. The second period ranges from detection of end of irradiation to start of readout.
1. A radiographic image capturing apparatus comprising:
a plurality of radiation detectors which are two-dimensionally arrayed;
a detecting unit configured to detect start and end of radiation irradiation to the plurality of radiation detectors;
a readout circuit configured to read the image data from the plurality of radiation detectors; and
a controller configured to control the readout circuit to repeat an operation in which a readout of the image data of next image capturing starts after a standby time has elapsed from an end of readout of the image data of previous image capturing so that a series of a plurality of radiographic image are captured;
wherein the controller is structured to control the readout circuit to change a length of the standby time based on a first period and a second period so as to avoid an overlap between the timing of the readout of image data from the plurality of radiation detectors and the timing of the radiation irradiation to the plurality or radiation detectors;
wherein the first period is a period of time from an end of readout of the image data of a previous radiographic image capturing to a detection of a start of irradiation with radiation in the current capturing;
wherein the second period is a period of time from a detection of an end of irradiation of radiation of the current radiographic image capturing to a start of readout of the image data of the current radiographic image capturing; and
wherein the controller changes the standby time so that a time length of the first period becomes closer to a time length of the second period when the standby time is changed.
2. The radiographic image capturing apparatus of claim 1 , wherein the standby time is changed at a fixed time span.
3. The radiographic image capturing apparatus of claim 1 , wherein the controller determines whether the time required for readout of the image data is changed, in addition to whether the standby time is changed.
4. The radiographic image capturing apparatus of claim 1 , wherein during readout of the image data conducted by sequentially applying the ON-state voltage supplied from the scanning driving unit to each scanning line, the controller controls the scanning driving unit such that timing of switching of the scanning line to the OFF-state voltage by the scanning driving unit is in synchronization with timing of application of the ON-state voltage to a next scanning line on which the ON-state voltage is to be applied.
5. The radiographic image capturing apparatus of claim 1 , wherein during readout of the image data conducted by sequentially applying the ON-state voltage supplied from the scanning driving unit to each scanning line, the controller sets a time interval from switching of the scanning line to the OFF-state voltage by the scanning driving unit to application of the ON-state voltage to a next scanning line on which the ON-state voltage is to be applied such that a voltage at the output of the operational amplifier in the readout circuit does not fall below or equal to a lower limit voltage.
6. A radiographic image capturing system comprising:
the radiographic image capturing apparatus of claim 1 ,
a radiation generator which emits radiation toward the radiographic image capturing apparatus; and
an image processor which generates a radiographic image based on the image data transmitted from the radiographic image capturing apparatus, wherein
the controller in the radiographic image capturing apparatus transmits the image data acquired by a series of radiographic image capturing to the image processor together with information on the standby time, and
the image processor performs offset correction on the image data based on the information on the standby time to generate a radiographic image.
7. A radiographic image capturing system comprising:
the radiographic image capturing apparatus of claim 3 ;
a radiation generator which emits radiation toward the radiographic image capturing apparatus; and
an image processor which generates a radiographic image based on the image data transmitted from the radiographic image capturing apparatus, wherein
during transmission of the image data acquired by a series of radiographic image capturing, the controller in the radiographic image capturing apparatus transmits the image data read at a changed readout time for readout of the image data to the image processor together with information on the changed readout time, and
the image processor corrects the image data with the information on the changed readout time for readout of the image data based on the information to generate a radiographic image.
8. A radiographic image capturing apparatus comprising;
a plurality of radiation detectors which are two-dimensionally arrayed;
a detecting unit configured to detect start and end of radiation irradiation to the plurality of radiation detectors;
a readout circuit configured to read the image data from the plurality of radiation detectors; and
a controller configured to control the read out circuit to repeat an operation in which a readout of the image data of text image capturing starts after a standby time has elapsed from an end of readout of the image data of previous image capturing so that a series of a plurality of radiographic image are captured;
wherein the controller is structured to control the readout circuit to change a length of the standby time based on a first period and a second period so as to avoid an overlap between the timing of the read out of image data from the plurality of radiation detectors and the timing of the radiation irradiation to the plurality or radiation detectors;
wherein the first period is a period of time from an end of readout of the image data of a previous radiographic image capturing to a detection of a start of irradiation with radiation in the current capturing;
wherein the second period is a period of time from a detection of an end of irradiation of radiation of the current radiographic image capturing to a start of readout of the image data of the current radiographic image capturing;
wherein the controller determines whether the time required for readout of the image data is changed, in addition to whether the standby time is changed; and
wherein the controller changes the time required for readout of the image data so that a time length of the first period becomes closer to a time length of the second period when the time required for readout of the image data is changed.