Radiation image detecting device and control method thereof, and radiation imaging system
First Claim
1. A radiation image detecting device comprising:
- (A) a detection panel having an imaging surface having a plurality of pixels arranged in two dimensions, for detecting a radiation image of an object from electric charge accumulated in said pixels in accordance with radiation emitted from a radiation source and passed through said object;
(B) a plurality of dose measuring sensors disposed in said imaging surface;
(C) an AEC section for performing automatic exposure control based on signals from said dose measuring sensors, said AEC section including;
a measurement area setting circuit for setting a measurement area to be used for measuring a radiation dose on said imaging surface, said measurement area setting circuit being switchable between a specified area mode for performing an area selecting process to set up a first measurement area in a position predetermined in accordance with a body part to be imaged and an automatic area setting mode for performing an automatic area setting process to set up a second measurement area based on distribution of said radiation dose measured by said dose measuring sensors;
a mode switching circuit for switching said measurement area setting circuit between said specified area mode and said automatic area setting mode;
an integration circuit for integrating said signal from said dose measuring sensor present within said first or second measurement area, in order to obtain an integrated value corresponding to said radiation dose; and
a comparison circuit for comparing said integrated value with a predetermined emission stop threshold value, wherein when said integrated value has reached said emission stop threshold value, the comparison circuit outputs an emission stop signal to stop radiation emission from said radiation source.
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Accused Products
Abstract
An AEC section of an electronic cassette includes a measurement area setting circuit for setting a measurement area in an imaging surface. The measurement area setting circuit is switchable between a specified area mode and an automatic area setting mode. In the specified area mode, a first measurement area is set up in a position predetermined in accordance with a body part to be imaged. In the automatic area setting mode, a second measurement area is set up based on the distribution of an X-ray dose measured by measuring pixels. X-ray emission time is shortened in the specified area mode, because the setting of the first measurement area is quickly performed. The automatic area setting mode eliminates the need for troublesome positioning between a patient and an FPD.
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Citations
14 Claims
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1. A radiation image detecting device comprising:
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(A) a detection panel having an imaging surface having a plurality of pixels arranged in two dimensions, for detecting a radiation image of an object from electric charge accumulated in said pixels in accordance with radiation emitted from a radiation source and passed through said object; (B) a plurality of dose measuring sensors disposed in said imaging surface; (C) an AEC section for performing automatic exposure control based on signals from said dose measuring sensors, said AEC section including; a measurement area setting circuit for setting a measurement area to be used for measuring a radiation dose on said imaging surface, said measurement area setting circuit being switchable between a specified area mode for performing an area selecting process to set up a first measurement area in a position predetermined in accordance with a body part to be imaged and an automatic area setting mode for performing an automatic area setting process to set up a second measurement area based on distribution of said radiation dose measured by said dose measuring sensors; a mode switching circuit for switching said measurement area setting circuit between said specified area mode and said automatic area setting mode; an integration circuit for integrating said signal from said dose measuring sensor present within said first or second measurement area, in order to obtain an integrated value corresponding to said radiation dose; and a comparison circuit for comparing said integrated value with a predetermined emission stop threshold value, wherein when said integrated value has reached said emission stop threshold value, the comparison circuit outputs an emission stop signal to stop radiation emission from said radiation source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A control method of a radiation image detecting device including a detection panel having an imaging surface having a plurality of pixels arranged in two dimensions and detecting a radiation image of an object from electric charge accumulated in said pixels in accordance with radiation emitted from a radiation source and passed through said object, a plurality of dose measuring sensors disposed in said imaging surface, and an AEC section for performing automatic exposure control based on signals from said dose measuring sensors, said control method comprising the steps of:
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switching said AEC section between a specified area mode and an automatic area setting mode, an area selecting process being performed in said specified area mode to set up a first measurement area in a position predetermined in accordance with a body part to be imaged of said object, an automatic area setting process being performed in said automatic area setting mode to set up a second measurement area based on distribution of a radiation dose measured by said dose measuring sensors; performing a chosen one of said area selecting process and said automatic area setting process in order to set up one of said first and second measurement areas; integrating a signal from said dose measuring sensor present within said one of said first and second measurement areas to obtain an integrated value corresponding to said radiation dose; comparing said integrated value with a predetermined emission stop threshold value; and when said integrated value has reached said emission stop threshold value, outputting an emission stop signal to stop radiation emission from said radiation source.
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14. A radiation imaging system comprising:
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(A) a radiation source for emitting radiation; (B) a radiation image detecting device for detecting a radiation image from said radiation emitted from said radiation source and passed through an object, said radiation image detecting device including; (b1) a detection panel having an imaging surface having a plurality of pixels arranged in two dimensions, for detecting said radiation image from electric charge accumulated in said pixels in accordance with said radiation incident on said pixels; (b2) a plurality of dose measuring sensors disposed in said imaging surface; (b3) an AEC section for performing automatic exposure control based on signals from said dose measuring sensors, said AEC section including; a measurement area setting circuit for setting a measurement area to be used for measuring a radiation dose on said imaging surface, said measurement area setting circuit being switchable between a specified area mode for performing an area selecting process to set up a first measurement area in a position predetermined in accordance with a body part to be imaged and an automatic area setting mode for performing an automatic area setting process to set up a second measurement area based on distribution of said radiation dose measured by said dose measuring sensors; a mode switching circuit for switching said measurement area setting circuit between said specified area mode and said automatic area setting mode; an integration circuit for integrating said signal from said dose measuring sensor present within said first or second measurement area, in order to obtain an integrated value corresponding to said radiation dose; and a comparison circuit for comparing said integrated value with a predetermined emission stop threshold value, wherein when said integrated value has reached said emission stop threshold value, the comparison circuit outputs an emission stop signal to stop radiation emission from said radiation source.
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Specification