JP2013240433A - Radiographic system and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a risk of unnecessary exposure to X rays for a subject caused by disappearance of a radiographic image.SOLUTION: In a radiographic system, wherein a radiography apparatus for capturing a radiographic image of a subject carries out radio communication with an X-ray generation apparatus for irradiating the subject with X rays and a personal computer for receiving the radiographic image, the lowest communication speed in the radio communication is computed (S202) based on the image data amount when the radiographic image is transmitted from the radiography apparatus and a user waiting permissible time that is the maximum permissible time in image transmission, and the lowest communication speed computed in the step S202 is set (S204) when the radiography apparatus is shifted to a radiography possible state (S203), and the radiographic image is transmitted to the personal computer from the radiography apparatus via a radio communication medium (S210) at least at the lowest communication speed set in the step S204.

Description

  The present invention relates to a radiographic system that captures a radiographic image of a subject and a control method thereof. In the description of the present specification, an example is shown in which X-rays are applied as radiation. However, the present invention is not limited to this, and examples of radiation include α rays, β rays, and γ rays. And

  Conventionally, synchronous communication with an X-ray generator is performed, X-rays are irradiated onto a subject at a desired timing, an X-ray image that is an intensity distribution of X-rays transmitted through the subject is digitized, and the digitized X-ray image is converted to the digitized X-ray image. A digital X-ray imaging apparatus (hereinafter simply referred to as “X-ray imaging apparatus”) that performs necessary image processing to generate a clearer X-ray image and an X-ray imaging system using the X-ray imaging apparatus are products. It has become. In such an X-ray imaging system, an X-ray image acquired by the X-ray imaging apparatus is obtained by irradiating X-rays after synchronous communication for adjusting the timing of X-ray irradiation between the X-ray generation apparatus and the X-ray imaging apparatus. Data is transferred to an image processing apparatus such as a personal computer for image processing and storage. Then, the image processing apparatus performs a process of displaying the image processed image on a display device such as a display.

  In addition, there are an increasing number of products that perform communication in an X-ray imaging system using a method such as Ethernet (registered trademark) communication defined by IEEE 802.3 or a wireless LAN defined by IEEE 802.11.

  In wireless LAN communication, when there is another wireless LAN communication that uses the same band as the frequency being used in the vicinity, external noise due to unnecessary radio waves generated by electronic devices, the distance between communication devices, etc. , SNR (signal-to-noise ratio) may decrease. When the SNR is low and high-speed communication cannot be performed, the wireless LAN communication has a function of maintaining communication by gradually switching to low-speed communication having strong resistance to SNR degradation.

JP 2011-98025 A JP 2011-41866 A

  Conventionally, as a method for preventing a problem due to a decrease in communication speed, a method for calculating a communication speed from a data transfer time and data size received in the past and displaying the same on a display unit is known (see Patent Document 1). However, with this method, if the wireless environment such as external noise when the data is transferred in the past and the next data is transferred is different, the communication speed at the next data transfer cannot be predicted. The transfer time may take longer than expected.

  Conventionally, a method is known in which the communication environment is evaluated from the response time of a synchronization signal performed immediately before X-ray imaging, and when the communication environment is bad, X-ray irradiation is not performed (see Patent Document 2). However, in this method, since the amount of communication in synchronous communication is small, there is a response within the set time even when the communication speed is low, and X-ray irradiation may be performed. In this case, although X-ray irradiation has been performed, an image transfer time with a large amount of data may take longer than expected by the user.

  In wireless communication, if wireless communication fails due to noise, etc., the communication speed is reduced and retransmitted, but the communication speed is not increased immediately, but communication is performed at a lower communication speed for a certain period of time, and the communication speed is gradually increased. Control is often performed. If the wireless environment temporarily deteriorates during image transfer and the communication speed drops, even if the wireless environment recovers, it takes time to recover the communication speed, and the image transfer time takes longer than expected. Sometimes.

  As described above, when the image transfer time takes longer than expected, the X-ray image (radiation image) disappears due to a system timeout or a user erroneously determining that the system is abnormal and resetting the system. Therefore, there is a possibility that X-ray exposure (radiation exposure) is unnecessary for the subject.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a mechanism for avoiding a situation in which a radiation image is lost and a radiation exposure is unnecessary for a subject. To do.

In the radiographic system of the present invention, a radiographic apparatus that captures a radiographic image of a subject communicates wirelessly with a radiation generating apparatus that irradiates the subject with radiation and a receiving apparatus that receives the radiographic image via a wireless communication medium. A radiographic system configured to irradiate the subject with radiation after performing wireless communication of a command related to radiation irradiation between the radiation generating apparatus and the radiographic apparatus, the radiographic apparatus comprising: Based on the amount of image data when transmitting the radiation image and the maximum permissible time of image transmission, a calculation means for calculating a minimum communication speed in the wireless communication, and when the radiation imaging apparatus shifts to an imaging enabled state A setting means for setting the minimum communication speed in the wireless communication calculated by the calculation means, and a front from the radiation imaging apparatus. The receiving device via a wireless communication medium to, and a transmission means for transmitting the radiation image by the minimum transmission rate or communication speed set by the setting means.
The present invention also includes a control method using the above-described radiation imaging system.

  ADVANTAGE OF THE INVENTION According to this invention, the situation where a radiographic image will lose | disappear and it will become useless radiation exposure for a subject can be avoided.

1 is a schematic diagram illustrating an example of a schematic configuration of an X-ray imaging system (radiation imaging system) according to a first embodiment of the present invention. It is a flowchart which shows an example of the process sequence in the control method of the X-ray imaging system (radiography system) which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows an example of the process sequence in the control method of the X-ray imaging system (radiation imaging system) which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows the 1st Embodiment of this invention and shows an example of communication speed control when there is no reply of an ACK command. FIG. 5 is a characteristic diagram illustrating an example of communication speed control illustrated in FIG. 4 according to the first embodiment of this invention. It is a schematic diagram which shows an example of schematic structure of the X-ray imaging system (radiography system) which concerns on the 2nd Embodiment of this invention. It is a schematic diagram which shows an example of the process sequence in the control method of the X-ray imaging system (radiation imaging system) which concerns on the 2nd Embodiment of this invention.

  Hereinafter, embodiments (embodiments) for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic diagram showing an example of a schematic configuration of an X-ray imaging system (radiation imaging system) according to the first embodiment of the present invention.
As shown in FIG. 1, an X-ray imaging system 100-1 according to this embodiment includes an X-ray imaging apparatus 101, an X-ray tube 102, an X-ray generation apparatus 103, an irradiation switch 104, and an X-ray synchronization signal processing apparatus 105. , A PC (personal computer) 110, a display 111, a network switching hub 112, and a wireless access point 113.

  The X-ray imaging apparatus (radiation imaging apparatus) 101 includes a wireless device and a flat panel X-ray detector (FPD). The X-ray imaging apparatus 101 performs wireless communication with the wireless access point 113 through a built-in wireless device. In addition, the X-ray imaging apparatus 101 performs a preparatory operation before X-ray irradiation in the built-in FPD, and then shifts to an accumulation operation to acquire image charges based on X-rays transmitted through the subject (subject) H. Then, the image charges are read out to form X-ray image data (radiation image data).

  The X-ray tube (radiation tube) 102 irradiates the subject H with X-rays that are radiation.

  The X-ray generator (radiation generator) 103 generates X-rays from the X-ray tube 102 when the irradiation switch 104 is pressed, and irradiates the subject H with X-rays.

  The irradiation switch 104 is a switch for the user to instruct the X-ray generation apparatus 103 to perform X-ray irradiation.

  An X-ray synchronization signal processing apparatus (radiation synchronization signal processing apparatus) 105 adjusts the timing of X-ray irradiation and converts commands between the X-ray generation apparatus 103 and the X-ray imaging apparatus 101.

  The PC 110 comprehensively controls operations in the X-ray imaging system 100-1. For example, the PC 110 controls the operation of the X-ray imaging apparatus 101 to perform X-ray imaging of the subject H, receives X-ray image data obtained by X-ray imaging from the X-ray imaging apparatus 101, and performs the X-ray imaging Perform image processing of image data.

  The display 111 displays an X-ray image based on the X-ray image data processed by the PC 110. Further, the display 111 displays various information and the like based on the control of the PC 110 as necessary.

  The network switching hub 112 performs relay in a network constructed in the X-ray imaging system 100-1.

  The wireless access point 113 is a wireless communication medium that performs wireless communication with the X-ray imaging apparatus 101.

  For example, the X-ray synchronization signal processing device 105, the network switching hub 112, the PC 110, and the wireless access point 113 are connected by a LAN cable, and Ethernet communication conforming to IEEE 802.3 is possible. Further, for example, the X-ray imaging apparatus 101 and the wireless access point 113 are connected in an infrastructure mode of wireless communication conforming to IEEE 802.11.

  As described above, in this embodiment, the X-ray imaging apparatus 101 that captures an X-ray image of the subject H and the X-ray generation apparatus 103 that irradiates the subject H with X-rays via the wireless access point 113 and the X-ray image. Wireless communication with a PC (receiving device) 110 that receives the signal.

  FIG. 2 is a flowchart showing an example of a processing procedure in the control method of the X-ray imaging system (radiography system) according to the first embodiment of the present invention.

  First, in step S201, the PC 110 receives an input of an allowable waiting time from the user before X-ray imaging, and sets the input allowable waiting time of the user. The user's allowable waiting time may be set as a fixed value when the X-ray imaging system 100-1 is constructed, or may be set for each user, or may be set for each imaging. Note that the allowable waiting time for the user corresponds to the maximum allowable time for image transmission.

  Subsequently, in step S202, the PC 110 calculates the minimum communication speed based on (the amount of image data of the X-ray imaging apparatus 101) / (the user's allowable waiting time). Specifically, the PC 110 calculates a value larger than the value obtained by dividing the image data amount of the X-ray imaging apparatus 101 by the user's allowable waiting time as the minimum communication speed. More specifically, the PC 110 calculates (minimum communication speed)> (image data amount of the X-ray imaging apparatus 101 used for imaging) / (user waiting allowable time) + (margin value) to calculate the minimum communication speed. calculate. Here, since the effective wireless communication speed is often about half of the theoretical communication speed, it is necessary to determine the margin value in consideration of this point. Further, as the amount of image data of the X-ray imaging apparatus 101, the amount of image data when an X-ray image is transmitted from the FPD inside the X-ray imaging apparatus 101 can be applied. Then, the PC 110 displays the calculated minimum communication speed on the display 111.

  Subsequently, in step S203, the X-ray imaging apparatus 101 transitions (transitions) to an imaging enabled state based on, for example, control of the PC 110.

  Subsequently, in step S204, the PC 110 sets a value equal to or higher than the minimum communication speed calculated in step S202 for the wireless access point 113 as the minimum communication speed. At this time, the PC 110 transmits a minimum communication speed setting command to the wireless access point 113 to set the minimum communication speed. The wireless access point 113 broadcasts a usable communication speed, and the wireless client can know the communication speed capable of communicating with the target access point from the broadcast data, and transmits from the communicable communication speed. Determine the communication speed. That is, when the minimum communication speed is set for the wireless access point 113, the X-ray imaging apparatus 101 connected wirelessly knows that transmission to the wireless access point 113 is not possible at low speed communication. In the subsequent communication, transmission is performed only at a communication speed equal to or higher than the minimum communication speed.

  Subsequently, in step S205, the X-ray generation apparatus 103 detects this when the user presses the irradiation switch 104. Even if the X-ray generation apparatus 103 detects that the user presses the irradiation switch 104, the X-ray tube 102 does not immediately irradiate the X-ray, and the X-ray generation apparatus 103 determines that the irradiation switch 104 has been pressed. This is transmitted to the synchronization signal processing device 105.

  Subsequently, in step S206, the X-ray synchronization signal processing apparatus 105 transmits an X-ray irradiation request command to the X-ray imaging apparatus 101 through wireless communication via the wireless access point 113.

  Subsequently, in step S207, the X-ray imaging apparatus 101 that has received the X-ray irradiation request command performs a preparation operation for imaging, and transmits to the X-ray synchronization signal processing apparatus 105 by wireless communication via the wireless access point 113. In response, an X-ray irradiation permission command is transmitted.

  Subsequently, in step S <b> 208, the X-ray synchronization signal processing apparatus 105 that has received the X-ray irradiation permission command transmits an X-ray irradiation permission signal to the X-ray generation apparatus 103. The X-ray generation apparatus 103 that has received the X-ray irradiation permission signal performs X-ray irradiation on the subject H from the X-ray tube 102.

  Note that the wireless communication in steps S206 and S207 described above is performed at a speed equal to or higher than the minimum communication speed set in step S204. Therefore, in the case of a wireless environment in which image data communication takes a long time but communication is possible. Since communication fails, X-ray irradiation is not performed. Therefore, in the present embodiment, X-ray imaging can be performed, but the image communication time does not take longer than expected. That is, in the present embodiment, by setting the minimum communication speed higher, X-ray irradiation is permitted only in an environment where the wireless environment is better than before.

  Subsequently, in step S209, the X-ray imaging apparatus 101 accumulates image charges based on X-rays transmitted through the subject H in the built-in FPD, and then reads the image charges to form X-ray image data.

  Subsequently, in step S210, the X-ray imaging apparatus 101 transmits the X-ray image data formed in step S209 to the PC 110 by wireless communication via the wireless access point 113 at a communication speed equal to or higher than the minimum communication speed. To do.

  Subsequently, in step S211, the PC 110 that has received the X-ray image data performs image processing on the X-ray image data, and then displays an X-ray image based on the image-processed X-ray image data on the display 111. Then, the process of the flowchart shown in FIG.

  Through the processes in steps S201 to S211, the process in the control method of the X-ray imaging system according to the present embodiment is performed.

  FIG. 3 is a schematic diagram illustrating an example of a processing sequence in the control method of the X-ray imaging system (radiation imaging system) according to the first embodiment of the present invention.

  First, the user inputs an allowable waiting time to the PC 110, and the PC 110 sets the input allowable waiting time.

  Subsequently, the PC 110 calculates the minimum communication speed based on (the amount of image data of the X-ray imaging apparatus 101) / (the user's allowable waiting time).

  Subsequently, the PC 110 transmits a minimum communication speed setting command to the wireless access point 113 to set the minimum communication speed.

  When the user presses the irradiation switch 104, the X-ray generation device 103 detects this and notifies the X-ray synchronization signal processing device 105 to that effect.

  Subsequently, the X-ray synchronization signal processing apparatus 105 transmits an X-ray irradiation request command to the X-ray imaging apparatus 101 by wireless communication via the wireless access point 113.

  Subsequently, the X-ray imaging apparatus 101 that has received the X-ray irradiation request command performs an imaging preparation operation and performs X-rays to the X-ray synchronization signal processing apparatus 105 by wireless communication via the wireless access point 113. Send an irradiation permission command. When the X-ray irradiation permission command is transmitted, the X-ray imaging apparatus 101 starts an accumulation operation.

  Subsequently, the X-ray synchronization signal processing apparatus 105 that has received the X-ray irradiation permission command transmits an X-ray irradiation permission signal to the X-ray generation apparatus 103 and receives the X-ray irradiation permission signal. Performs X-ray irradiation on the subject H from the X-ray tube 102. During this X-ray irradiation period, the X-ray imaging apparatus 101 accumulates image charges based on X-rays transmitted through the subject H in the built-in FPD.

  When the X-ray irradiation is completed, the X-ray imaging apparatus 101 reads the image charges accumulated in the FPD and forms X-ray image data. Thereafter, the X-ray imaging apparatus 101 transmits the formed X-ray image data to the PC 110 by wireless communication via the wireless access point 113 at a communication speed equal to or higher than the minimum communication speed.

  Subsequently, the PC 110 that has received the X-ray image data performs image processing on the X-ray image data, and then displays an X-ray image based on the X-ray image data subjected to the image processing on the display 111.

  Through the processing of FIG. 3 described above, processing in the control method of the X-ray imaging system according to the present embodiment is performed.

Here, the wireless communication in the process of step S210 shown in FIG. 2 and the X-ray image data transmission process from the X-ray imaging apparatus 101 to the PC 110 shown in FIG. 3 will be described.
In wireless communication, the data receiving side returns an ACK command indicating that data has been received to the data transmitting side. The transmission side knows that the data transmission was successful by receiving the ACK command, and transmits the next data. The transmission side performs communication speed control in order to perform efficient communication based on the SNR of the received data, the response status of the ACK command, and the like. When there is no ACK command response from the receiving side, the transmitting side retransmits the data. At this time, control is performed to reduce the transmission speed and increase the communication success probability.

FIG. 4 is a schematic diagram illustrating an example of communication speed control when there is no ACK command reply according to the first embodiment of this invention.
FIG. 4A shows an example when the usable communication speed of the wireless access point 113 is set to 54 Mbps, 24 Mbps, 6 Mbps, 2 Mbps, and 1 Mbps. FIG. 4B is an example when the usable communication speed of the wireless access point 113 is set to 54 Mbps, 24 Mbps, and 6 Mbps.

  In the case of FIG. 4A, since the wireless environment is initially bad and an ACK command cannot be received for data transmission of 24 Mbps, data transmission of 6 Mbps is performed at a reduced communication speed. However, since the ACK command could not be received even when the communication speed was 6 Mbps, data transmission was performed with the communication speed reduced to 2 Mbps and 1 Mbps, but no ACK command was returned. Thereafter, when the wireless environment recovers and the ACK command can be received for data transmission with a communication speed of 1 Mbps, the communication speed is gradually increased to 2 Mbps, 6 Mbps, 24 Mbps, and 54 Mbps. As described above, when the communication speed is increased, in this embodiment, the communication speed control is performed to increase the communication speed when a predetermined condition is satisfied at each communication speed, instead of immediately from 1 Mbps to 54 Mbps. In the example shown in FIG. 4A, the communication speed is increased by one step when there are two consecutive communication successes. The reason for performing such communication speed control is that if communication speed is suddenly increased and communication fails again, the communication speed is gradually decreased until communication succeeds. This is because the possibility of lowering is high.

  In the case of FIG. 4B, since the wireless environment is initially bad and an ACK command cannot be received for data transmission of 24 Mbps, data transmission of 6 Mbps is performed at a reduced communication speed. However, since a transmission speed of 6 Mbps or lower is unusable, data transmission is repeated again at a communication speed of 6 Mbps. Thereafter, when the wireless environment is recovered and the ACK command can be received for data transmission with a communication speed of 6 Mbps, the communication speed is increased to 24 Mbps and 54 Mbps.

  4 (a) and 4 (b) show examples using the same communication speed control, but the case shown in FIG. 4 (b) is 54 Mbps faster than the case shown in FIG. 4 (a). It can be seen that the communication speed has been recovered. As described above, in FIG. 4A, since the number of times of data transmission is high, the transfer time of the image data is longer than that in FIG. 4B.

FIG. 5 shows the first embodiment of the present invention and is a characteristic diagram showing an example of the communication speed control shown in FIG.
FIG. 5A shows a communication speed control graph (horizontal axis: time, vertical axis: communication speed) corresponding to FIG. FIG. 5B shows a communication speed control graph (horizontal axis: time, vertical axis: communication speed) corresponding to FIG. 4B.

  In FIG. 5A and FIG. 5B, the transition of the wireless environment is shown as the same, and the period when the wireless environment is bad is the same. From the characteristics shown in the graph, it can be seen that the time taken to recover the communication speed is shorter in FIG. 5B when the minimum communication speed is increased than in FIG. 5A.

  With the above control method, it is possible to avoid the time required to transfer the image data longer than expected. As a result, X-ray image data is lost due to a system timeout or a user misjudging a system abnormality and performing an operation such as a system reset, resulting in unnecessary X-ray exposure for the subject. Can be prevented.

  The present invention is not limited to the above-described embodiment. For example, the calculation (calculation) of the minimum communication speed is not performed by the PC 110 but performed by another device (for example, the X-ray imaging apparatus 101). Also good. Further, the minimum communication speed may be displayed on another display device instead of the display 111. Further, instead of displaying the minimum communication speed, a value related to the minimum communication speed such as a user's allowable waiting time and maximum transfer time may be displayed. In the case of an X-ray imaging system that captures a moving image, 1 / moving image frame rate [frame / sec] (that is, a time determined by the reciprocal of the frame rate necessary for capturing a moving image) is set as the allowable waiting time of the user. You may calculate. Further, the minimum communication speed may be set in the X-ray imaging apparatus 101 instead of being set in the wireless access point 113.

(Second Embodiment)
FIG. 6 is a schematic diagram illustrating an example of a schematic configuration of an X-ray imaging system (radiation imaging system) according to the second embodiment of the present invention. In FIG. 6, the same components as those of the X-ray imaging system according to the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, an X-ray imaging system 100-2 according to this embodiment includes an X-ray imaging apparatus 101, an X-ray tube 102, an X-ray generation apparatus 103, an irradiation switch 104, and an X-ray synchronization signal processing apparatus 105. , PC 110, display 111, and wireless adapter 120.

  The wireless adapter 120 is, for example, a USB communication with the PC 110 and is a wireless communication medium that performs wireless communication with the X-ray imaging apparatus 101. Note that the wireless adapter 120 may be a wireless device built in the PC 110.

  For example, the X-ray synchronization signal processing apparatus 105 and the PC 110 are connected by a LAN cable, and Ethernet communication conforming to IEEE 802.3 is possible. Further, for example, the X-ray imaging apparatus 101 and the wireless adapter 120 are connected in an ad hoc mode of wireless communication conforming to IEEE 802.11. In the ad hoc mode, there is no wireless access point serving as a wireless master unit, and each wireless terminal may perform ad hoc communication instead of broadcasting the usable communication speed from the access point.

  The processing procedure in the control method of the X-ray imaging system 100-2 according to the second embodiment adopts the processing procedure in the control method of the X-ray imaging system 100-1 according to the first embodiment shown in FIG. Can do. At this time, since the X-ray imaging system 100-2 according to the present embodiment does not have the wireless access point 113 of the X-ray imaging system 100-1 according to the first embodiment, in step S204, the wireless adapter 120 and / or A minimum communication speed is set for the X-ray imaging apparatus 101. The other processing is the same as that described in the first embodiment, and thus description thereof is omitted.

FIG. 7 is a schematic diagram illustrating an example of a processing sequence in the control method of the X-ray imaging system (radiation imaging system) according to the second embodiment of the present invention.
7 is different from the processing sequence in the first embodiment shown in FIG. 3 in that the wireless access point 113 is replaced with the wireless adapter 120 and the minimum communication speed is set with the wireless adapter 120 and the X-ray imaging apparatus. 101 is set for both. The other processing is the same as that described in the first embodiment, and thus description thereof is omitted.

(Other embodiments)
The present invention can also be realized by executing the following processing.
That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.
This program and a computer-readable recording medium storing the program are included in the present invention.

  Note that the above-described embodiments of the present invention are merely examples of implementation in practicing the present invention, and the technical scope of the present invention should not be construed as being limited thereto. It is. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

100-1 X-ray imaging system, 101 X-ray imaging apparatus, 102 X-ray tube, 103 X-ray generation apparatus, 104 irradiation switch, 105 X-ray synchronization signal processing apparatus, 110 PC (personal computer), 111 display, 112 network Switching hub, 113 wireless access point

Claims (9)

A radiation imaging apparatus that captures a radiation image of a subject is configured to be capable of wireless communication with a radiation generation device that irradiates the subject with radiation and a reception device that receives the radiation image via a wireless communication medium, and the radiation generation A radiography system that irradiates the subject with radiation after performing wireless communication of a command related to radiation irradiation between the apparatus and the radiography apparatus,
Calculation means for calculating a minimum communication speed in the wireless communication based on an image data amount when transmitting the radiation image from the radiation imaging apparatus and a maximum allowable time of image transmission;
A setting means for setting the minimum communication speed in the wireless communication calculated by the calculation means when the radiation imaging apparatus shifts to an imaging enabled state;
Transmitting means for transmitting the radiation image at a communication speed equal to or higher than the minimum communication speed set by the setting means from the radiation imaging apparatus to the receiving apparatus via the wireless communication medium. Radiography system. The wireless communication medium is a wireless access point;
The radiation imaging system according to claim 1, wherein the setting unit sets the minimum communication speed by transmitting a minimum communication speed setting command to the wireless access point. The wireless communication medium is a wireless adapter;
The radiation imaging system according to claim 1, wherein the setting unit sets the minimum communication speed by transmitting a minimum communication speed setting command to the wireless adapter and / or the radiation imaging apparatus.   The radiation imaging system according to claim 1, wherein the calculating unit is included in the receiving device.   The radiation imaging system according to claim 1, wherein the calculation unit is included in the radiation imaging apparatus.   The calculating means calculates, as the minimum communication speed, a value larger than a value obtained by dividing the amount of image data when the radiation image is transmitted from the radiation imaging apparatus by the maximum allowable time of the image transmission. The radiation imaging system according to any one of claims 1 to 5.   The radiation imaging system according to claim 1, wherein the maximum allowable time for image transmission is a time obtained by a reciprocal of a frame rate necessary for capturing a moving image.   The radiation imaging system according to claim 1, wherein the wireless communication medium is configured inside the receiving device. A radiation imaging apparatus that captures a radiation image of a subject is configured to be capable of wireless communication with a radiation generation device that irradiates the subject with radiation and a reception device that receives the radiation image via a wireless communication medium, and the radiation generation A radiography system control method for irradiating the subject with radiation after performing wireless communication of a command related to radiation irradiation between the apparatus and the radiation imaging apparatus,
A calculation step of calculating a minimum communication speed in the wireless communication based on an amount of image data when transmitting the radiation image from the radiation imaging apparatus and a maximum allowable time of image transmission;
A setting step for setting the minimum communication speed in the wireless communication calculated in the calculation step when the radiation imaging apparatus shifts to an imaging enabled state;
A transmission step of transmitting the radiation image at a communication speed equal to or higher than the minimum communication speed set in the setting step from the radiation imaging apparatus to the reception apparatus via the wireless communication medium. A method for controlling a radiation imaging system.

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