X-ray diagnostic apparatus

Patent metadata

Field	Value
Publication number	US-11896419-B2
Application number	US-202117643939-A
Country	US
Kind code	B2
Filing date	Dec 13, 2021
Priority date	Dec 14, 2020
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

An X-ray diagnostic apparatus of an embodiment includes an input interface, and processing circuitry. The input interface accepts an input operation performed by an operator. The processing circuitry identifies a period in which periodic movement is small in an X-ray irradiation area. The processing circuitry determines irradiation start timing of an X-ray according to the period. The processing circuitry controls to perform X-ray irradiation of a relatively high dose in the determined irradiation start timing on condition that the input operation is being continued.

First claim

What is claimed is:

1. An X-ray diagnostic apparatus comprising:
an input interface configured to accept an input operation performed by an operator; and
processing circuitry configured to
identify a period in which periodic movement is small in an irradiation area of an X-ray,
determine irradiation start timing of an X-ray according to the period, and
control to perform X-ray irradiation of a relatively high dose in the determined irradiation start timing on condition that the input operation is being continued.

2. The X-ray diagnostic apparatus according to claim 1 , wherein the processing circuitry is configured to
sequentially generate X-ray images based on an X-ray that has been emitted from an X-ray tube, and that has passed through a subject, and
identify the period in which periodic movement is small based on a plurality of X-ray images sequentially generated.

3. The X-ray diagnostic apparatus according to claim 1 , wherein the processing circuitry is configured to identify the period in which periodic movement is small based on electrocardiogram data.

4. The X-ray diagnostic apparatus according to claim 2 , wherein the processing circuitry is configured to identify the period in which periodic movement is small based on the X-ray images and electrocardiogram data.

5. The X-ray diagnostic apparatus according to claim 1 , wherein the processing circuitry is configured to determine an X-ray condition based on the period in which periodic movement is small according to continuation of the input operation.

6. The X-ray diagnostic apparatus according to claim 5 , wherein the processing circuitry is configured to determine a pulse width according to length of the period in which periodic movement is small.

7. The X-ray diagnostic apparatus according to claim 5 , wherein the processing circuitry is configured to determine a focal spot size according to length of the period in which periodic movement is small and a targeted dose.

8. The X-ray diagnostic apparatus according to claim 2 , wherein the processing circuitry is configured to calculate, based on the X-ray images, a degree of the periodic movement at respective positions in the X-ray images.

9. The X-ray diagnostic apparatus according to claim 2 , wherein the processing circuitry is configured to calculate a degree of movement based on a magnitude of the periodic movement at respective positions in the X-ray images and a weighting coefficient corresponding to the respective positions.

10. The X-ray diagnostic apparatus according to claim 2 , wherein the processing circuitry is configured to determine, according to continuation of the input operation, a pulse width for the X-ray irradiation of a relatively high dose, based on a pulse width for X-ray irradiation at generating the X-ray images and motion blur in the X-ray images.

11. The X-ray diagnostic apparatus according to claim 1 , further comprising
a detector configured to perform a plurality of readouts during irradiation of an X-ray for one pulse, wherein
the processing circuitry is configured to calculate a degree of the periodic movement by using a plurality of X-ray images based on a result of the readouts by the detector.

12. The X-ray diagnostic apparatus according to claim 1 , wherein the processing circuitry is configured to determine the irradiation start timing according to an injection state of a contrast agent into a blood vessel.

13. The X-ray diagnostic apparatus according to claim 1 , wherein the processing circuitry is configured to
identify the period in which periodic movement is small after set time has passed since injection of a contrast agent into a blood vessel is started, and
determine the irradiation start timing based on the identified period in which periodic movement is small.

14. The X-ray diagnostic apparatus according to claim 1 wherein the processing circuitry is configured to
determine an injection state of a contrast agent based on a plurality of X-ray images collected at injection of the contrast agent into a blood vessel, and
determine the irradiation start timing according to a determination result.

15. The X-ray diagnostic apparatus according to claim 2 , wherein the processing circuitry is configured to control to irradiate, after the X-ray irradiation of a relatively high dose is performed, an X-ray at a lower dose than a dose in the X-ray irradiation, and to sequentially generate X-ray images.

16. The X-ray diagnostic apparatus according to claim 2 , wherein the processing circuitry is configured to subject a high-dose X-ray image that is acquired by the X-ray irradiation of a relatively high dose to degradation processing.

17. The X-ray diagnostic apparatus according to claim 2 , wherein the processing circuitry is configured to generate an interpolation image corresponding to a time phase between a time phase of an X-ray image that is acquired last in the X-ray images, and a time phase of a high-dose X-ray image acquired by the X-ray irradiation of a relatively high dose.

18. The X-ray diagnostic apparatus according to claim 17 , wherein the processing circuitry is configured to generate an interpolation image corresponding to a time phase between a time phase of the high-dose X-ray image, and a time phase of an X-ray image acquired by irradiating, after performing the X-ray irradiation of a relatively high dose, an X-ray at a lower dose than a dose in the X-ray irradiation.

19. The X-ray diagnostic apparatus according to claim 1 , wherein the processing circuitry is configured to determine the irradiation start timing according to time necessary until the X-ray irradiation is performed from when a control signal to instruct the X-ray irradiation of a relatively high dose is output.

20. The X-ray diagnostic apparatus according to claim 3 , wherein the processing circuitry is configured to
acquire electrocardiogram data from an electrocardiograph, and
determine the irradiation start timing according to time from a signal is output by the electrocardiograph until the signal is acquired.

21. The X-ray diagnostic apparatus according to claim 1 , wherein the input interface is configured to accept an input operation to switch an irradiation mode in which the X-ray irradiation of a relatively high dose is performed, before accepting continuation of an input operation.

22. The X-ray diagnostic apparatus according to claim 1 , wherein
the input interface is configured to accept a change input operation made by an operator relating to at least one of the irradiation start timing and an X-ray condition, according to a state of a high-dose X-ray image that is acquired by X-ray irradiation of a relatively high dose, and
the processing circuitry is configured to control to perform the X-ray irradiation of a relatively high dose in which at least one of the irradiation start timing and the X-ray condition is changed, according to the change input operation.

23. The X-ray diagnostic apparatus according to claim 1 , wherein the processing circuitry is configured to cause a display to display a high-dose X-ray image that is acquired by the X-ray irradiation of a relatively high dose.

24. The X-ray diagnostic apparatus according to claim 23 , wherein the processing circuitry is configured to cause the display to sequentially display a plurality of X-ray images, an interpolation image corresponding to a time phase between a time phase of an X-ray image acquired last in the X-ray ima

Assignees

• Canon Medical Systems Corp

Inventors

• Abe Shingo
• Matsumoto Kunitoshi

Classifications

• A61B6/541 Primary

  involving acquisition triggered by a physiological signal · CPC title

• A61B6/467

  characterised by special input means · CPC title

• A61B6/481

  involving the use of contrast agents · CPC title

• A61B6/482

  involving multiple energy imaging · CPC title

• A61B6/542

  involving control of exposure · CPC title