Radiation image capturing apparatus and radiation image capturing system

Patent metadata

Field	Value
Publication number	US-11154261-B2
Application number	US-202016845197-A
Country	US
Kind code	B2
Filing date	Apr 10, 2020
Priority date	May 17, 2019
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

A radiation image capturing apparatus is provided. The apparatus comprises pixels, drivers to which row signal lines for driving the pixels for each row are respectively connected and a controller. The controller supplies, before radiation irradiation, selection signals to a driver group constituted by not less than two drivers which drive detection pixels, of the pixels, to cause each of the drivers included in the driver group to select a row signal line to which the detection pixels are connected, and the controller supplies, during radiation irradiation, a drive signal for driving pixels connected to a row signal line selected from the plurality of row signal lines to each driver included in the driver group to cause the radiation image capturing apparatus to acquire a signal for measuring a dose of radiation entering from each of the detection pixels.

First claim

What is claimed is:

1. A radiation image capturing apparatus, comprising:
a plurality of pixels arranged in a matrix pattern configured to obtain a radiation image;
a plurality of drive circuits to which a plurality of row signal lines configured to drive the plurality of pixels for each row are respectively connected; and
a controller connected to the plurality of drive circuits via at least one of the signal lines and configured to control the plurality of drive circuits, wherein
before radiation irradiation the controller supplies selection signals to a drive circuit group comprising at least two of the drive circuits that drive at least two detection pixels to cause each of the drive circuits included in the drive circuit group to select one of the plurality of row signal lines to which the detection pixels are connected in order to set the detection pixels for measuring a dose of radiation entering from the plurality of pixels during radiation irradiation, and
during radiation irradiation the controller supplies a drive signal for driving pixels connected to one of the row signal lines to each drive circuit included in the drive circuit group to cause the radiation image capturing apparatus to acquire a signal for measuring a dose of radiation entering from each of the detection pixels.

2. The apparatus according to claim 1 , wherein the controller has is configured to individually supply the drive signal and the selection signal to each drive-circuit of the plurality of drive circuits.

3. The apparatus according to claim 2 , wherein the controller is configured to supply the selection signals before radiation irradiation in parallel to drive circuits in the drive circuit group.

4. The apparatus according to claim 1 , wherein the plurality of pixels includes a pixel that can be set as the detection pixel and a pixel that cannot be set as the detection pixel, and
the controller is configured to individually supply the drive signal and the selection signal to each of the plurality of drive circuits that drives the pixel that can be set as the detection pixel.

5. The apparatus according to claim 1 , wherein the plurality of pixels includes a pixel that can be set as the detection pixel and a pixel that cannot be set as the detection pixel, and
the controller is configured to individually supply the drive signal to each of the plurality of drive circuits that drives the pixel that can be set as the detection pixel.

6. The apparatus according to claim 1 , wherein the controller is configured to individually supply the drive signal during radiation irradiation to each drive circuit in the drive circuit group.

7. The apparatus according to claim 1 , wherein the controller is configured to simultaneously supply the drive signal during radiation irradiation to each drive circuit in the drive circuit group.

8. The apparatus according to claim 1 , wherein the controller is configured not to supply the drive signal during radiation irradiation to any drive circuit that is not included in the drive circuit group.

9. The apparatus according to claim 1 , wherein during radiation irradiation the controller does not supply the selection signal to any drive circuit in the drive circuit group.

10. The apparatus according to claim 1 , wherein the controller is configured not to supply the selection signal to the plurality of drive circuits during radiation irradiation.

11. The apparatus according to claim 1 , wherein the controller is configured to not supply the selection signal to any drive circuit that is not included in the drive circuit group while each drive circuit in the drive circuit group is made to select one of the plurality of row signal lines to which the detection pixel is connected.

12. The apparatus according to claim 1 , wherein each of the plurality of drive circuits includes a shift register.

13. The apparatus according to claim 1 , wherein the detection pixels are respectively connected to different drive circuits of the plurality of drive circuits.

14. The apparatus according to claim 1 , wherein the controller is configured to cause each drive circuit in the drive circuit group to select one of the plurality of row signal lines to which the detection pixel is connected after a user issues an instruction to start radiation irradiation and before radiation irradiation is performed.

15. The apparatus according to claim 14 , wherein the controller is configured to perform a reset operation of resetting the plurality of pixels by supplying the selection signal and the drive signal to the plurality of drive circuits before a user issues an instruction to titan radiation irradiation.

16. The apparatus according to claim 1 , further comprising a detector rotation provided with the plurality of pixels, wherein
the controller is configured to change an order of acquiring signals from the detection pixels in accordance with a direction of the detector in an in-plane direction.

17. The apparatus according to claim 1 , wherein the detection pixels include a first detection pixel and a second detection pixel, and
the controller is configured to change a sampling period in which a signal is acquired during radiation irradiation in accordance with the first detection pixel and the second detection pixel.

18. The apparatus according to claim 1 , wherein the radiation image capturing apparatus is configured to transmit a signal for stopping radiation irradiation to a radiation generator for irradiating the radiation image capturing apparatus with radiation to perform exposure control when a dose of radiation measured based on signals acquired from the plurality of pixels reaches a preset dose or is expected to reach the preset dose.

19. A radiation image capturing system, comprising:
the radiation image capturing apparatus according to claim 1 ; and
a signal processor configured to process a signal from the radiation image capturing apparatus.

Assignees

• Canon Kk

Inventors

• Okada Hideyuki

Classifications

• A61B6/542 Primary

  involving control of exposure · CPC title

• G01N2223/306

  computer control · CPC title

• G01T1/17

  Circuit arrangements not adapted to a particular type of detector {(pulse-selection circuits H03K, G01R)} · CPC title

• H05H7/00

  Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00 · CPC title

• A61B6/4233 Primary

  using matrix detectors · CPC title