# US 11,896,419 B2 · X-ray diagnostic apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,896,419 B2 - Document ID: US11896419B2 - Status: Granted - Kind: B2 - Application number: 17/643,939 - Filed: 2021-12-13 - Published: 2022-06-16 - Granted: 2024-02-13 - Earliest claimed: 2020-12-14 - Assignees: Canon Medical Systems Corporation - Applicants: Canon Medical Systems Corporation - Inventors: Shingo Abe; Kunitoshi Matsumoto - Web page: https://patentgrep.com/patent/US11896419B2 ## CPC - A61B 6/541: {involving acquisition triggered by a physiological signal} - A61B 6/467: {characterised by special input means} - A61B 6/481: {involving the use of contrast agents} - A61B 6/482: {involving multiple energy imaging} - A61B 6/5264: {due to motion} - A61B 6/542: {involving control of exposure} - A61B 6/4441: {the rigid structure being a C-arm or U-arm} - A61B 8/0841: {for locating instruments} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 2) 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. ### Claim 5 (depends on 1) 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. ### Claim 6 (depends on 5) 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. ### Claim 7 (depends on 5) 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. ### Claim 8 (depends on 2) 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. ### Claim 9 (depends on 2) 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. ### Claim 10 (depends on 2) 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. ### Claim 11 (depends on 1) 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. ### Claim 12 (depends on 1) 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. ### Claim 13 (depends on 1) 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. ### Claim 14 (depends on 1) 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. ### Claim 15 (depends on 2) 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. ### Claim 16 (depends on 2) 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. ### Claim 17 (depends on 2) 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. ### Claim 18 (depends on 17) 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. ### Claim 19 (depends on 1) 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. ### Claim 20 (depends on 3) 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. ### Claim 21 (depends on 1) 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. ### Claim 22 (depends on 1) 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. ### Claim 23 (depends on 1) 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. ### Claim 24 (depends on 23) 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 images and a time phase of the high-dose X-ray image, and the high-dose X-ray image.