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Radiographic imaging device and radiographic imaging system

Active Publication Date: 2013-05-08
KONICA MINOLTA MEDICAL & GRAPHICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0047] Furthermore, according to the studies of the present inventors, it has been found that there are cases where the interface between the radiographic imaging device and the radiation generating device is not constructed as described above, but is configured in a so-called non-cooperative state with the radiation generating device. When the radiographic imaging device itself detects the irradiation of radiation, since the influence of the offset Olag due to the lag remains, even if the offset is subtracted from the read image data D as the main image according to the above formula (2). Even if the data O is shifted, the proper real image data D* cannot be obtained

Method used

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Experimental program
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Effect test

no. 1 Embodiment approach ］

[0129] figure 1 is an external perspective view of the radiographic imaging device according to the present embodiment, figure 2 is along figure 1 The cross-sectional view of the XX line. The radiation imaging apparatus 1 according to the present embodiment is, for example, figure 1 , figure 2 As shown, the scintillator 3 , the substrate 4 , and the like are housed in the housing 2 .

[0130] The frame body 2 is formed of a material such as carbon plate or plastic through which at least the radiation incident surface R transmits radiation. In addition, in figure 1 , figure 2 In the figure, the case where the frame body 2 is a so-called lunch box type formed by the front plate 2A and the rear plate 2B is shown, but a so-called monocoque type (monocoque type) formed integrally with the frame body 2 in a square tube shape may also be adopted.

[0131] Additionally, if figure 1 As shown, a power switch 36, an indicator 37 composed of LEDs, etc. are arranged on the ...

no. 2 Embodiment approach ］

[0293] In the above-mentioned first embodiment, the acquisition process based on the offset data O (refer to Figure 19 , Figure 21B etc.) to correct the readout process immediately before the acquisition process of the offset data O (refer to Figure 18 , Figure 21B etc.) in the case of the official image data D read out. That is, the main image data D and offset data O obtained in one radiographic imaging are the targets.

[0294] On the other hand, as described above, it is known that the radiation imaging device 1 is again irradiated with radiation within the time close to the imaging of the radiation image (that is, while the influence of the hysteresis generated in the radiation image remains) to perform other operations. In the case of radiographic imaging, the offset amount Olag due to the hysteresis generated in the previous radiographic imaging remains in each radiation detection element 7, and is used as the so-called superimposed afterimages.

[0295] That i...

no. 3 Embodiment approach ］

[0350] As described above, there are still many unclear points about the mechanism of occurrence and continuation of hysteresis due to radiation to the radiographic imaging device 1 . Furthermore, if the configuration of the radiation detection element 7 where hysteresis occurs, the configuration of the TFT 8 that may be related to hysteresis leakage, or the bias voltage applied to the radiation detection element 7, the value of the cut-off voltage applied to the TFT 8, etc. are changed to other If the composition or value of the hysteresis is changed, the mechanism of occurrence and continuation of the hysteresis will change, so that the offset amount Olag due to the hysteresis is relative to the elapsed time t (hereinafter, the elapsed time tp in the case of the above-mentioned (9) formula etc. is included. ) may change in the form of approximate formulas, etc.

[0351] Therefore, there is a possibility that the form of the approximate equation to be used differs depending o...

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Abstract

Provided is a radiographic imaging device capable of accurately removing an offset caused by lag from image data constituting a main image. When a control means (22) of a radiographic imaging device (1) acquires dark image data (Od) prior to radiographic imaging and also reads out image data (d) to detect the start of irradiation of radiation on the basis of the read-out image data (d), the control means (22) applies an off-voltage to all scan lines (5) and shifts to a charge accumulation mode, sequentially applies an on-voltage to the scan lines (5) and reads out main image data (D) from radiation detection elements (7) after the irradiation of radiation has ceased, then acquires offset data (O) in a state in which the radiation is not being irradiated, and corrects the main image data (D) read out by means of said radiographic imaging or corrects the main image data (D); read out by means of radiographic imaging conducted after said radiographic imaging, with these corrections being made in accordance with an offset (Olag) caused by lag calculated on the basis of the offset data (O) and the dark image data (Od).

Description

technical field [0001] The present invention relates to a radiographic image pickup device and a radiographic image pickup system, and more particularly to a radiographic image pickup device and a radiographic image pickup system for acquiring image data free from the influence of lag. Background technique [0002] Various radiographic imaging devices have been developed as follows: so-called direct radiographic imaging devices that use detection elements to generate charges and convert them into electrical signals according to the dose of radiation such as X-rays to be irradiated; (scintillator) and other so-called indirect radiation images that convert the irradiated radiation into electromagnetic waves of other wavelengths such as visible light, and then use photoelectric conversion elements such as photodiodes to generate charges and convert them into electrical signals based on the energy of the converted electromagnetic waves. camera device. However, in the present in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00G01T1/17G01T7/00G03B42/02H04N5/32H04N5/361H04N5/374
CPCA61B6/4233H04N5/361H04N5/378H04N5/32A61B6/4208A61B6/5258A61B6/4283G03B42/02H04N25/63H04N25/78H10F39/803
Owner KONICA MINOLTA MEDICAL & GRAPHICS INC
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