JP7276522B2 - Imaging device and imaging system - Google Patents

Description

The present invention relates to a photographing device and a photographing system provided with this device.

Among radiation imaging apparatuses that generate image data by receiving radiation, there is a so-called indirect type that includes a flat scintillator and a flat sensor substrate arranged parallel to the scintillator. . In such an indirect radiography device, the scintillator emits light according to the intensity of the radiation received from the outside, each pixel of the sensor substrate accumulates electric charge according to the intensity of the light received from the scintillator, and the amount of electric charge in each pixel is are converted into signal values to generate image data.
On the other hand, among radiation imaging apparatuses, there is a portable type called an FPD (Flat Panel Detector). Such a portable radiation imaging apparatus is often equipped with a wireless module for performing wireless communication with the outside, and is capable of wirelessly transmitting generated image data to an image display apparatus.

However, in indirect radiography equipment that performs such wireless communication, heat is generated when the wireless module transmits data. There is a problem that density unevenness occurs in the image data obtained.
Therefore, conventionally, there has been proposed a technique of monitoring the temperature of a wireless module during communication and changing data to be transmitted depending on whether the temperature exceeds a threshold value (see Patent Document 1). Specifically, when the temperature is equal to or higher than the threshold, only preview data with a small amount of data is transmitted, and when the temperature is less than the threshold, the preview and image data are transmitted.
By using this technique, it is possible to prevent image data with density unevenness from being used for diagnosis.

JP 2014-44179 A

In imaging using the technology described in Patent Document 1, as described above, image data is not transmitted when the temperature of the wireless module exceeds the threshold, but the scintillator may be housed in the housing. Yes, once the temperature rises, it takes a certain amount of time to return to the original temperature. Therefore, once the temperature of the wireless module reaches the threshold value or more and the transmission of image data is stopped, the state in which the image data cannot be transmitted continues for a relatively long time.
For this reason, it takes time to display an image on an external image display device after photographing, which delays diagnosis.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in a radiation imaging apparatus capable of transmitting generated image data to the outside by wireless communication, the heat generation of a wireless module is suppressed without stopping the transmission of image data. for the purpose.

In order to solve the above problems, the imaging device of the present invention includes:
a sensor panel having a sensor substrate in which a plurality of pixels are arranged two-dimensionally;
an image generating means for generating image data based on charges accumulated by each pixel of the sensor substrate;
a wireless module having a plurality of antennas and capable of transmitting image data generated by the image generating means to the outside via wireless communication;
a first temperature sensor that measures the temperature of a portion of the sensor panel near the wireless module;
a second temperature sensor that measures the temperature of a part of the sensor panel different from the part where the first temperature sensor measures temperature;
communication control means for controlling transmission of the image data by the wireless module based on a difference value between the measured value of the first temperature sensor and the measured value of the second temperature sensor;
The first temperature sensor is attached at a location in contact with the outline of the wireless module when viewed in a direction orthogonal to the sensor panel, at a location through the outline, or at a location outside the outline. be
The second temperature sensor is outside the outline of the wireless module when viewed in a direction orthogonal to the sensor panel , and is located further away from the first temperature sensor when viewed from the center of the wireless module. attached to the
It is characterized by

According to the present invention, heat generation of a wireless module can be suppressed without stopping transmission of image data.

1 is a block diagram showing a schematic configuration of a radiation imaging system according to first and second embodiments of the present invention; FIG. 1 is a perspective view of a radiographic apparatus included in a radiographic imaging system according to first and second embodiments; FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. FIG. 2 is a plan view of a sensor substrate included in the radiation imaging apparatus according to the first and second embodiments; 2 is a block diagram showing the electrical configuration of part of the radiation imaging apparatus according to the first embodiment; FIG. FIG. 3 is a schematic diagram showing an arrangement example of a first temperature sensor included in the radiation imaging apparatus according to the first embodiment; 4 is a schematic diagram showing an arrangement example of a first temperature sensor and a second temperature sensor included in the radiation imaging apparatus according to the first embodiment; FIG. 4 is a flowchart showing communication speed control processing executed by the radiation imaging apparatus according to the first embodiment;

<First embodiment>
A first embodiment of the present invention will be described below with reference to the drawings. However, the invention is not limited to what is illustrated in the drawings.

[Configuration of radiation imaging system]
First, a schematic configuration of a radiation imaging system according to this embodiment will be described. FIG. 1 is a block diagram showing the configuration of a radiation imaging system 100 of this embodiment.
As shown in FIG. 1, the radiation imaging system 100 of this embodiment includes a radiation irradiation device 1, a radiation imaging device 2, an image display device 3, and the like.
The radiography system 100 can also be connected to a radiology information system (RIS), a picture archiving and communication system (PACS), and the like (not shown).

The radiation irradiation device 1 generates radiation, and includes a generator 11, an irradiation switch 12, a radiation source 13, and the like.
When the exposure switch 12 is operated, the generator 11 applies a voltage to the radiation source 13 according to preset radiation irradiation conditions (tube voltage, tube current, irradiation time (mAs value), etc.). is configured to allow
The radiation source 13 (tube) has a rotating anode, a filament, etc. (not shown). Then, when a voltage is applied from the generator 11, an electron beam corresponding to the voltage applied to the filament is irradiated toward the rotating anode, and the rotating anode emits a dose of radiation X (such as X-rays) corresponding to the intensity of the electron beam. ) is generated.

Although FIG. 1 illustrates an example in which the exposure switch 12 is connected to the generator 11, the exposure switch 12 may be provided in another device (for example, an operator console (not shown)).
Moreover, the radiation irradiation apparatus 1 may be installed in an imaging room, or may be configured to be movable by being incorporated in a medical vehicle or the like.

The radiation imaging device 2 is connected to the image display device 3 so as to be able to communicate wirelessly.
Then, the radiation imaging apparatus 2 can generate image data of a radiation image according to the radiation received from the outside and transmit it to the image display apparatus 3 .
Details of the radiation imaging apparatus 2 will be described later.

The image display device 3 is configured to have a display unit 3a by a PC, a mobile terminal, or a dedicated device, and is connected to the radiation imaging device 2 and the like so as to be able to communicate wirelessly.
The image display device 3 can wirelessly receive image data from the radiation imaging device 2 and display a diagnostic image based on the image data on the display unit 3a.
In addition, to the radiation imaging system 100, for example, a console for setting various imaging conditions of the radiation irradiation device 1 and the radiation imaging device 2, a dedicated analysis device for performing predetermined image processing on image data, etc. are connected, They may be used as the image display device 3 .

[Configuration of radiation imaging apparatus]
Next, the configuration of the radiation imaging apparatus 2 included in the radiation imaging system 100 will be described. 2 is a perspective view of the radiation imaging device 2, FIG. 3 is a cross-sectional view of III-III in FIG. 2, FIG. 4 is a plan view of a sensor substrate provided in the radiation imaging device 2, and FIG. 1 is a block diagram showing a typical configuration; FIG.
FIG. 2 illustrates a panel-type portable radiographic apparatus 2, but the present invention is applicable to a so-called stationary radiographic apparatus integrally formed with a support stand or the like. is also applicable.

The radiation imaging apparatus 2 according to this embodiment is a so-called indirect type that converts emitted radiation (such as X-rays) into electromagnetic waves of other wavelengths such as visible light to obtain electric signals. As shown, in addition to the housing 21, the housing 21 includes a scintillator 22, a sensor board 23, a control board 24, a wireless module 25, a battery 26, temperature sensors 27 and 28, and the like. there is

A power switch 21a, an operation switch 21b, an indicator 21c, a connector 21d, and the like are provided on the side surface of the housing 21, as shown in FIG.
One of the plurality of surfaces of the housing 21 is a radiation entrance surface 21e.

The scintillator 22 is made of, for example, a columnar crystal of CsI in a flat plate shape, and emits light upon receiving radiation. It has become.
3, the scintillator 22 is arranged in the housing 21 so as to extend parallel to the radiation entrance surface 21e.

The sensor substrate 23 is arranged so that a plurality of pixels P capable of accumulating electric charges are arranged two-dimensionally and extend parallel to the radiation incident surface 21 e and the scintillator 22 .
In the case of this embodiment, as shown in FIG. 4, it is composed of a substrate 23a, a plurality of scanning lines 23b, a plurality of signal lines 23c, a plurality of radiation detection elements 23d, a plurality of TFTs 23e, a plurality of bias lines 23f, and the like. ing. One pixel P is a rectangular area surrounded by adjacent scanning lines 23b and adjacent signal lines 23c.
The gate of each TFT 23e is connected to the scanning line 23b, the source is connected to the signal line 23c, and the drain is connected to the radiation detection element 23d.
An end (terminal) of each scanning line 23b is connected to a gate driver (not shown), an end (terminal) of each signal line 23c is connected to a readout circuit (not shown), and a bias line 23f is connected to a power supply circuit (not shown). there is
Hereinafter, a combination of the scintillator 22 and the sensor substrate 23 described above is sometimes referred to as a sensor panel 2a.

The control substrate 24 is arranged on the surface of the sensor substrate 23 opposite to the surface facing the scintillator 22, as shown in FIGS.
The control board 24 is connected to a gate driver (not shown), a readout circuit, a power supply circuit, and the like via wiring (not shown).
In addition to the CPU 24a, the control board 24 includes RAM, ROM, and the like (not shown).
The CPU 24a is configured to centrally control the operation of each section of the radiation imaging apparatus 2 . Specifically, various programs stored in the ROM are read out and developed in the RAM, and various processes are executed to operate each section according to the programs.

Similarly to the control board 24 , the wireless module 25 is also arranged on the surface of the sensor board 23 opposite to the surface facing the scintillator 22 .
The wireless module 25 includes a plurality of amplifier circuits 25a and a plurality of antennas 25b connected to each amplifier circuit 25a.
Although FIG. 5 illustrates the radio module 25 having three sets of amplifier circuits 25a and antennas 25b, it may have two sets or four sets or more.
Each amplifier circuit 25a is connected to the control board 24 via a command line.

The wireless module 25 configured in this manner can transmit various data generated by the CPU 24a to the outside by wireless communication.
Further, the wireless module 25 is capable of communication using MIMO (multiple-input and multiple-output). Specifically, according to a control signal from the CPU 24a of the control board 24, it is possible to increase or decrease the number of antennas 25b used for data transmission (the number of amplifier circuits 25a to be driven).

〔Temperature sensor〕
Next, the temperature sensor included in the radiation imaging apparatus 2 will be described. FIG. 6 is a schematic diagram showing an arrangement example of the first temperature sensor, and FIG. 7 is a schematic diagram showing an arrangement example of the first temperature sensor and the second temperature sensor.

The first temperature sensor 27 is connected to the CPU 24 a of the control board 24 and attached near the sensor panel 2 a and the wireless module 25 . That is, the temperature of the portion near the wireless module 25 on the sensor panel 2a is measured.
The mounting position of the first temperature sensor 27 is the surface of the portion of the sensor panel 2a that is greatly affected by the heat generated by the wireless module 25, that is, the surface of the portion where the heat generated by the wireless module 25 rises to a temperature that causes density unevenness in a short period of time. preferably. Specifically, for example, as shown in FIGS. 6A and 6B, between the sensor panel 2a and the wireless module 25, or as shown in FIG. It is preferable to set it at a position in contact with the contour line of the wireless module when viewed from an orthogonal direction, a position through which the contour line passes, or a position apart from the contour line by a predetermined distance d.

In addition, a plurality of temperature sensors can be provided. In that case, the second temperature sensor 28 attached is connected to the CPU 24a of the control board 24, and is the part of the sensor panel 2a where the first temperature sensor 27 measures the temperature. will measure the temperature of different parts.
The mounting position of the second temperature sensor 28 may be any position on the surface of the sensor panel 2a as long as it is separated from the first temperature sensor 27 when viewed from the center of the wireless module 25. It is preferable to use the surface of a portion where the heat generation of the wireless module 25 is less affected, that is, the surface of a portion where the temperature does not rise much even if the heat generation of the wireless module 25 continues for a predetermined period of time. Specifically, for example, as shown in FIG. 7, it is preferable to be outside the contour line of the wireless module when viewed from the direction orthogonal to the radiation incident surface 21e (including the case where it contacts the contour line). .

The CPU 24a of the control board 24 of the radiation imaging apparatus 2 configured as described above has the following functions.
For example, the CPU 24a has a function of generating image data based on charges accumulated by each pixel P of the sensor substrate. Specifically, the gate driver turns off the TFT 23e to accumulate the charge generated by the radiation detection element 23d in the pixel P, and then the gate driver turns on the TFT 23e to transfer the accumulated charge through the signal line 23f. is sent to the readout circuit, and image data is generated from the plurality of signal values read out by the readout circuit.
That is, the CPU 24a serves as image generating means in the present invention.

Also, the CPU 24 a has a function of acquiring a measured value from the first temperature sensor 27 .
In addition, when a plurality of temperature sensors are used, a function of calculating a temperature difference value by subtracting another measured value from one of the obtained measured values is further provided.
The CPU 24a also has a function of comparing the acquired measurement value or difference value with a predetermined threshold value.
In addition, the CPU 24a uses the wireless module 25 to transmit image data based on the measured value of the first temperature sensor 27 or the difference value between the measured value of the first temperature sensor 27 and the measured value of the second temperature sensor 28. It has a function of controlling the number of antennas 25b to be connected.

The threshold for comparison is the limit temperature of the measurement target region such that the difference between the sensitivity of the room temperature region of the sensor panel 2a and the sensitivity of the measurement target region of the first temperature sensor 27 is such that density unevenness is visible. The following values are assumed.
When a plurality of temperature sensors are used, the threshold value is set so that the difference between the sensitivity of the first temperature sensor 27 and the second temperature sensor 28 is such that density unevenness can be visually recognized. It shall be a value equal to or less than the critical difference value.
In particular, it is preferable from the viewpoint of preventing density unevenness from occurring that a temperature or a difference value that is several degrees Celsius lower than the limit temperature or the limit difference value is set as the threshold value.

[Communication speed control processing]
Next, communication speed control processing executed by the radiation imaging apparatus 2 will be described. FIG. 8 is a flowchart of communication speed control processing.
In addition to the functions described above, the CPU 24a also functions when a predetermined condition is met (for example, when a predetermined operation is performed by the user, when the CPU 24a starts transmitting image data to the wireless module 25, when power is supplied to the wireless module, etc.). ) as a trigger to execute the communication speed control process.

In this communication speed control process, as shown in FIG. 8, first, the measured value of the temperature of the sensor panel 2a is obtained from the first temperature sensor 27 (step S1).
Here, when a plurality of temperature sensors are provided, in step S1, the measured values of the respective temperature sensors 27 and 28 are obtained, and the difference value is calculated by subtracting the other measured value from one measured value. conduct.
Next, the obtained measured value or difference value is compared with a predetermined threshold value to determine whether or not it is equal to or greater than the threshold value (step S2).

If it is determined in step S2 that the measured value or the difference value is equal to or greater than the threshold value (step S2; Yes), it is determined whether or not the number of antennas used by the wireless module to transmit image data is one. Determine (step S3).
If it is determined in step S3 that the number of antennas being used is one (step S3; Yes), the process returns to step S1.
On the other hand, if it is determined in step S3 that the number of antennas being used is not one, that is, two or more (step S3; No), an instruction is given to reduce the number of antennas being used by one. A signal is transmitted to the wireless module (step S4), and the process proceeds to step S5.
When the radio module 25 receives this signal, it continues communication by using one less antenna than before.

If it is determined in step S2 that the measured value or difference value obtained from the temperature sensors 27 and 28 is not equal to or greater than the threshold value, that is, is less than the threshold value (step S2; No), the number of antennas being used is the maximum number. It is determined whether or not there is (step S6).
If it is determined in step S6 that the number of antennas being used is the maximum number (step S6; Yes), the process returns to step S1.
On the other hand, if it is determined in step S6 that the number of antennas in use is not the maximum number (step S6; No), a signal instructing to increase the number of antennas in use by one is transmitted to wireless module 25. (step S7), the process proceeds to step S5.
When the radio module 25 receives this signal, it continues communication by using one more antenna than before.

In step S5, it is determined whether or not itself (the CPU 24a) is in the middle of transmitting image data to the wireless module 25 or not.
If it is determined in step S5 that the image data is being transmitted (step S5; Yes), the process returns to step S1.
On the other hand, if it is determined in step S5 that the image data has not been transmitted (step S5; No), the communication speed control process is terminated.
The CPU 24a serves as communication control means in the present invention by executing such processing.
Although there is no particular specification for the number of antennas to be used at the start of this process, it is preferable to use the maximum number in order to speed up the transmission of image data as much as possible.

As described above, in the radiation imaging apparatus 2 according to the present embodiment, the plate-shaped scintillator 22 that emits light when receiving radiation and the plurality of pixels P capable of accumulating electric charges are arranged two-dimensionally. A sensor panel 2a having a sensor substrate 23 arranged parallel to the scintillator 22, a CPU 24a (image generating means) for generating image data based on charges accumulated in each pixel P of the sensor substrate 23, and a plurality of antennas. a wireless module 25 capable of transmitting image data generated by the CPU 24a to the image display device 3 (external) by wireless communication; A temperature sensor 27 and a CPU 24a (communication control means) for controlling the number of antennas 25b used by the wireless module 25 to transmit image data based on the measured value of the first temperature sensor 27. there is

Each amplifier circuit 25a of the wireless module 25 generates heat when transmitting data. In addition, the more antennas used for data transmission, the more amplifier circuits are used, and accordingly the amount of heat generated increases. The heat generated by this wireless module raises the temperature of the adjacent sensor panel 2a.
Since the wireless module 25 is smaller than the sensor panel 2a, it faces part of the sensor panel 2a. Therefore, when the wireless module 25 generates heat, the temperature of only a portion of the sensor panel 2a rises.
The sensitivity of the sensor panel 2a (the emission intensity of the scintillator 22 with respect to the dose of radiation or the amount of charge accumulated in the pixels P) changes according to the temperature of the sensor panel. That is, when the temperature of a part of the sensor panel 2a rises compared to the surroundings, the sensitivity of the pixels P varies (a state in which only some of the pixels P have different sensitivities).

However, by using the radiation imaging system according to the present embodiment, if the temperature of a portion of the sensor panel 2a near the wireless module exceeds the threshold while the wireless module 25 is transmitting data, the wireless module 25 is used. reduce the number of antennas As a result, the amount of heat generated by the wireless module 25 decreases, and the temperature of a part of the sensor panel 2a whose temperature has exceeded the threshold until then begins to decrease. As a result, density unevenness is less likely to occur in the image data being transmitted.

On the other hand, since the radiation imaging apparatus 2 according to the present embodiment does not have means for cooling the inside, the temperature drop of the sensor panel 2a is moderate. However, since the wireless module 25 continues to transmit image data even though the number of antennas used is reduced, there is no problem with a conventional device that stops transmitting image data when the temperature of the wireless module rises. In comparison, image data can be transmitted to an image display device such as a console more quickly.
That is, it is possible to suppress the heat generation of the wireless module without stopping the image data transmission, and as a result, it is possible to prevent the diagnosis from being delayed due to the image data not arriving.

Further, when a plurality of temperature sensors are used, the degree of density unevenness that will occur in the image can be grasped by detecting the temperature of the portion that is greatly affected by the heat generation of the wireless module 25 and the temperature of the portion that is less affected. be able to Therefore, the number of antennas to be used can be controlled more accurately than when only one first temperature sensor 27 is used. As a result, image data can be efficiently transmitted without wastefully reducing the number of antennas used for data transmission.

In the communication speed control process, the power consumption per antenna 25b may be controlled according to the number of antennas 25b used by the wireless module 25 to transmit image data. Specifically, each amplifier circuit 25a increases power consumption when transmitting a signal instructing to increase the number of antennas to be used, and decreases power consumption when reducing the number of antennas.
In this way, the power control means of the present invention is formed, and heat generation of the wireless module 25 can be suppressed more than in the case of simply controlling the number of antennas to be used.

<Second embodiment>
A second embodiment of the present invention will be described below. Here, the same reference numerals are assigned to the same configurations as in the first embodiment, and the description thereof is omitted.

The radiation imaging apparatus 2 included in the radiation imaging system 100 according to the first embodiment controls the number of antennas used by the wireless module 25 to transmit image data based on the measured value of the temperature sensor. The radiation imaging apparatus 2A provided in the radiation imaging system 100A according to this embodiment controls the number of antennas based on the set imaging mode.
Therefore, the radiation imaging apparatus 2A of this embodiment differs from that of the first embodiment in the processing executed by the CPU 24a.

The imaging mode defines the imaging operation of the radiation imaging apparatus 2A, and in the present embodiment, there are two modes: still image imaging mode and moving image imaging mode.
The still image shooting mode is a shooting mode in which one image is shot by operating the exposure switch once. The moving image shooting mode is a shooting mode in which a plurality of frame images are repeatedly shot during one operation of the exposure switch.
Since a moving image consists of a plurality of frame images, it generally has a larger amount of data than a still image. In other words, the still image shooting mode and the moving image shooting mode are shooting modes that generate different amounts of image data.

The CPU 24a of the radiation imaging apparatus 2A of the present embodiment receives, for example, a control signal from a console connected to the radiation imaging apparatus 2A, or when an operation switch 21b provided in the radiation imaging apparatus 2 is operated. It has a function of setting the photographing mode to any one of a plurality of photographing modes based on the photographing mode. In other words, the CPU 24a serves as shooting mode setting means in the present invention.
In addition, the CPU 24a controls the number of antennas to be used as the shooting mode is set. Specifically, when the shooting mode is set to video shooting mode, the number of antennas used is reduced (not the maximum number), and when the shooting mode is set to still image shooting mode, the number of antennas used is increased (multiple ). That is, the CPU 24a serves as communication control means in the present invention.

In addition, since the CPU 24a of this embodiment does not use the temperature to control the number of antennas to be used, the function of acquiring the measured values from the temperature sensors 27 and 28 included in the CPU 24a of the first embodiment and the temperature It does not have a function of calculating a difference value, a function of comparing a measured value or a difference value with a predetermined threshold value, or a function of executing communication speed control processing.

As described above, the radiation imaging apparatus 2A according to the present embodiment includes the flat scintillator 22 that emits light when receiving radiation, and a plurality of pixels P that can store electric charges. A sensor substrate 23 arranged parallel to the scintillator 22, a CPU 24a (image generating means) for generating image data based on charges accumulated in each pixel P of the sensor substrate 23, and a plurality of antennas 25b. The wireless module 25 capable of transmitting the image data generated by to the image display device 3 (external) by wireless communication and the shooting mode that defines the shooting operation of the CPU 24a have different amounts of image data generated respectively. The number of antennas 25b used by the wireless module 25 to transmit image data is controlled based on the CPU 24a (shooting mode setting means) for setting either the still image shooting mode or the moving image shooting mode, and the shooting mode set by the CPU 24a. and a CPU 24a (communication control means).
By doing so, as in the first embodiment, heat generation of the wireless module can be suppressed without stopping image data transmission. can be made difficult.

It goes without saying that the present invention is not limited to the above embodiments and modifications, and can be modified as appropriate without departing from the gist of the present invention.

Reference Signs List 100, 100A radiographic apparatus 1 radiation irradiation apparatus 11 generator 12 exposure switch 13 radiation source 2, 2A radiographic apparatus 21 housing 21a power switch 21b operation switch 21c indicator 21d connector 21e radiation entrance surface 2a sensor panel 22 scintillator 23 sensor substrate 23a substrate 23b scanning line 23c signal line 23d radiation detection element 23f bias line 24 control substrate 25 wireless module 25a amplifier circuit 25b antenna 26 battery 27 first temperature sensor 28 second temperature sensor 3 image display device 3a display unit P pixel X radiation

Claims (5)

a sensor panel having a sensor substrate in which a plurality of pixels are arranged two-dimensionally;
an image generating means for generating image data based on charges accumulated by each pixel of the sensor substrate;
a wireless module having a plurality of antennas and capable of transmitting image data generated by the image generating means to the outside via wireless communication;
a first temperature sensor that measures the temperature of a portion of the sensor panel near the wireless module;
a second temperature sensor that measures the temperature of a part of the sensor panel different from the part where the first temperature sensor measures temperature;
communication control means for controlling transmission of the image data by the wireless module based on a difference value between the measured value of the first temperature sensor and the measured value of the second temperature sensor;
The first temperature sensor is mounted at a location in contact with the outline of the wireless module when viewed in a direction orthogonal to the sensor panel, a location through which the outline passes , or a location outside from the outline. be
The second temperature sensor is outside the outline of the wireless module when viewed in a direction orthogonal to the sensor panel , and is located further away from the first temperature sensor when viewed from the center of the wireless module. attached to the
An imaging device characterized by: The communication control means compares the difference value with a predetermined threshold,
The threshold is characterized in that the difference between the sensitivity of the part to be measured of the first temperature sensor and the sensitivity of the part to be measured of the second temperature sensor is a difference value equal to or less than a critical difference value at which density unevenness is visually recognized. The imaging device according to claim 1 . The communication control means controls the number of antennas used by the wireless module to transmit the image data based on the measured value of the first temperature sensor and the measured value of the second temperature sensor. The photographing device according to claim 1 or 2 . The imaging device includes a flat scintillator,
4. The imaging apparatus according to any one of claims 1 to 3 , wherein said sensor substrate is arranged so as to extend parallel to said scintillator. a radiation irradiation device that generates radiation;
an imaging device according to any one of claims 1 to 4 ;
and an image display device capable of wirelessly receiving image data from the imaging device and displaying an image based on the image data.

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