Search

JP-2026075879-A - Radiographic imaging apparatus, control method and program for radiographic imaging apparatus

JP2026075879AJP 2026075879 AJP2026075879 AJP 2026075879AJP-2026075879-A

Abstract

[Problem] In a radiography system that performs radiographic imaging of a subject without synchronization with a radiation generator, the objective is to acquire correction data that allows for appropriate correction of the radiographic image. [Solution] The system includes a non-irradiation period setting unit 1216 that sets a non-irradiation period for radiation R based on the end time of irradiation in a first irradiation period of radiation R and the start time of irradiation in a second irradiation period of radiation R; a correction data acquisition period setting unit 1217 that sets a correction data acquisition period for acquiring correction data to correct a radiation image obtained by photographing a subject H using radiation R during a period when radiation R is not irradiated, based on the start time of acquisition of correction data determined based on the end time of irradiation of radiation R and the non-irradiation period for radiation R; and a correction data acquisition unit 1218 that acquires correction data using a correction image obtained from photography during the correction data acquisition period. [Selection Diagram] Figure 1

Inventors

  • 宮地 紀彦

Assignees

  • キヤノン株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (14)

  1. A radiography apparatus that takes images of a subject using radiation emitted from a radiation generator without synchronizing with the radiation generator, A start time acquisition means for acquiring the start time of the radiation irradiation, An end time acquisition means for acquiring the end time of the radiation irradiation, Non-irradiation period setting means for setting a non-irradiation period of radiation based on the end time of irradiation in the first irradiation period of the radiation and the start time of irradiation in the second irradiation period, which is the irradiation period following the first irradiation period of the radiation; A correction data acquisition period for acquiring correction data to correct a radiation image obtained by photographing the subject using the radiation during a period when the radiation is not being applied, comprising an acquisition period setting means for setting the correction data acquisition period based on a start time for acquiring the correction data determined based on the end time of radiation irradiation and the period when the radiation is not being applied, A correction data acquisition means that acquires the correction data using the correction images obtained from the shooting during the correction data acquisition period, A radiography apparatus characterized by having the following features.
  2. The radiography apparatus according to claim 1, characterized in that the correction data acquisition means calculates the number of correction images to be taken based on the correction data acquisition period and the frame rate of the radiographic image, and acquires the correction data using the number of correction images to be taken.
  3. The correction images for the aforementioned number of shots are multiple correction images, The radiography apparatus according to claim 2, characterized in that the correction data acquisition means acquires the correction data by averaging the plurality of correction images.
  4. The radiation imaging apparatus according to claim 1, characterized in that the acquisition period setting means sets the acquisition start time of the correction data based on the end time of radiation irradiation and the non-irradiation period of radiation.
  5. The system further includes radiation detection means for detecting the aforementioned radiation as an electrical signal related to the aforementioned radiation image, The radiation imaging apparatus according to claim 1, characterized in that the acquisition period setting means sets the acquisition start time of the correction data based on the end time of radiation irradiation, the dose information of the radiation when photographing the subject, and the emission time of the residual electrical signal of the radiation detection means.
  6. The radiation imaging apparatus according to claim 1, characterized in that, if the acquisition period setting means includes the period from the acquisition start time of the correction data to the end time of the non-irradiation period of the radiation, the acquisition period of the correction data.
  7. The radiation imaging apparatus according to claim 1, characterized in that, if the acquisition start time of the correction data is not included in the non-irradiation period of the radiation, the acquisition period of the correction data is set to a predetermined period prior to the end time of the non-irradiation period of the radiation.
  8. The radiation detection means further includes an imaging pixel for detecting the radiation as an electrical signal relating to the radiation image, and a detection pixel for detecting the dose of the radiation. The start time acquisition means acquires the irradiation start time of the radiation without using the radiation dose detected using the detection pixel, The radiation imaging apparatus according to claim 1, characterized in that the termination time acquisition means acquires the termination time of radiation irradiation using the radiation dose detected using the detection pixel.
  9. The system further includes a power supply means that supplies a bias current to the imaging pixel and the detection pixel via a bias line, The radiation imaging apparatus according to claim 8, characterized in that the start time acquisition means acquires the irradiation start time of the radiation based on the value of the bias current.
  10. Until the start time acquisition means acquires the irradiation start time of the radiation, the value of the bias current is detected, and the detection of the radiation dose by the detection pixel is stopped. After the start time acquisition means acquires the irradiation start time of the radiation, the radiation image is acquired and the radiation dose is detected by the detection pixels, and the detection of the bias current value is stopped. The radiation imaging apparatus according to claim 9, wherein, after the termination time acquisition means acquires the termination time of radiation irradiation, the value of the bias current is detected, and the detection of the radiation dose by the detection pixel is stopped.
  11. If the period of the radiation at the end of irradiation time, as obtained by the end time acquisition means, falls outside a predetermined range, The means for obtaining the end time acquires the end time of the radiation irradiation again, The non-irradiation period setting means resets the non-irradiation period for the radiation, The acquisition period setting means resets the correction data acquisition period, The radiography apparatus according to claim 1, characterized in that the correction data acquisition means acquires the correction data again.
  12. The radiation imaging apparatus according to claim 1, characterized in that the correction data acquisition means updates and acquires the correction data for each of the multiple irradiation end cycles in the radiation irradiation end cycle determined based on the period between two consecutive irradiation end times in time series.
  13. A control method for a radiographic imaging apparatus that uses radiation emitted from a radiation generator to photograph a subject without synchronizing with the radiation generator, A start time acquisition step to acquire the start time of the radiation irradiation, A step to obtain the end time of the radiation irradiation, A non-irradiation period setting step, which sets a non-irradiation period for the radiation based on the end time of irradiation in the first irradiation period of the radiation and the start time of irradiation in the second irradiation period, which is the irradiation period following the first irradiation period of the radiation; A correction data acquisition period for acquiring correction data to correct a radiation image obtained by photographing the subject using the radiation during a period when the radiation is not being applied, comprising an acquisition period setting step of setting the correction data acquisition period based on a start time for acquiring the correction data determined based on the end time of radiation irradiation and the period when the radiation is not being applied, A correction data acquisition step in which correction data is acquired using correction images obtained during the correction data acquisition period, A method for controlling a radiography apparatus, characterized by having the following features.
  14. A program for causing a computer to perform each step in the control method of the radiography apparatus described in claim 13.

Description

This invention relates to a radiography apparatus, a control method for a radiography apparatus, and a program. There are radiography systems that perform fluoroscopy using continuous radiation irradiation from a radiation generator without synchronization with the radiation generator itself. For example, in a circuit board inspection system that uses radiation imaging to inspect circuit boards, when a circuit board moves along and is set in the imaging position while fluoroscopy is in progress, radiation imaging of that circuit board is performed. Then, in this circuit board inspection system, when radiation imaging is complete, the radiation irradiation stops, and the next circuit board moves along, and so on, with radiation irradiation and irradiation stopping (hereafter referred to as "non-irradiation" as needed) being repeated periodically. Patent Document 1 describes a technique for using one or more images acquired before radiation exposure is detected as offset correction images, even when the radiography apparatus and the radiation generator cannot be synchronized. Japanese Patent Publication No. 2021-186352 This figure shows an example of a schematic configuration of a radiography system according to the first embodiment.This figure shows an example of the schematic configuration of the radiation detection unit shown in Figure 1.This flowchart shows an example of a processing procedure in the control method for a radiography apparatus according to the first embodiment.This is a timing chart showing an example of a processing procedure in the control method for a radiography apparatus according to the first embodiment.This flowchart shows an example of a detailed processing procedure during the data acquisition period in step S101 of Figure 3.This flowchart shows an example of a detailed processing procedure during the data processing period in step S102 of Figure 3.This flowchart shows an example of a detailed processing procedure during the correction data update period in step S103 of Figure 3.This is a timing chart showing an example of a processing procedure in the control method for a radiography apparatus according to the second embodiment. The embodiments for carrying out the present invention will be described below with reference to the drawings. While X-rays are preferred as the radiation in the embodiments of the present invention described below, the present invention is not limited to X-rays and may include, for example, alpha rays, beta rays, gamma rays, particle beams, and cosmic rays. (First embodiment) First, let me describe the first embodiment. <Outline configuration of a radiography system> Figure 1 shows an example of a schematic configuration of a radiography system 10 according to the first embodiment. As shown in Figure 1, the radiography system 10 includes a radiography device 100 and a radiation generator 300. The radiation generator 300 and the radiography device 100 are not electrically connected, and therefore, no synchronization signals such as notifications for the start and end of radiation irradiation or notifications for the timing when radiation irradiation is possible are transmitted or received. As shown in Figure 1, the radiation generator 300 includes a radiation generation control unit 310, a radiation source 320, and an operation UI 330. The radiation generation control unit 310 controls whether or not to irradiate with radiation R from the radiation source 320, for example, based on operation input from the operation UI 330. The radiation source 320 irradiates or refrains from irradiating with radiation R based on the control of the radiation generation control unit 310. The operation UI 330 inputs operation input from the user to the radiation generation control unit 310. Examples of operation input include setting the irradiation conditions for radiation R and instructing whether to irradiate or not irradiate with radiation R. The radiography apparatus 100 is a radiography apparatus that performs radiography of a subject H using radiation R irradiated from the radiation source 320 of the radiation generator 300, without synchronization with the radiation generator 300. Here, the subject H is, for example, a circuit board, but in this embodiment, it is not limited to a circuit board; other subjects such as the human body can also be used. As shown in Figure 1, the radiography apparatus 100 has a radiation detection unit 110 and a control unit 120. The radiation detection unit 110 is a radiation detection means that detects incident radiation R as an electrical signal related to the radiation image of the subject H. The control unit 120 comprehensively controls the operation of the radiography apparatus 100 by performing various controls and also performs various processing. For example, the control unit 120 controls the imaging and communication operations of the radiation detection unit 110. Furthermore, the control unit 120 may control the operation of