X-ray diagnostic imaging apparatus, monitoring server and anomaly detection method

Patent metadata

Field	Value
Publication number	US-10357222-B2
Application number	US-201515529108-A
Country	US
Kind code	B2
Filing date	Dec 24, 2015
Priority date	Dec 26, 2014
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

In order to provide an X-ray diagnostic imaging apparatus which can detect anomalies caused by factors other than wearing of a bearing of an X-ray tube, according to the present invention, there is provided an X-ray diagnostic imaging apparatus including an X-ray tube that irradiates an object with X-rays, an X-ray detector that detects X-rays having been transmitted through the object, an image creation unit that creates a medical image of the object on the basis of the output of the X-ray detector, a change amount measurement unit that measures a change amount of an X-ray focal point which is an X-ray generation point of the X-ray tube, and an anomaly detection unit that detects an anomaly in the X-ray tube on the basis of whether or not the change amount falls within a predetermined normal change range.

First claim

The invention claimed is:

1. An X-ray diagnostic imaging apparatus comprising:
an X-ray tube that irradiates an object with X-rays;
an X-ray detector that detects X-rays having been transmitted through the object;
an image creation unit that creates a medical image of the object on the basis of the output of the X-ray detector;
a change amount measurement unit that measures a change amount of an X-ray focal point which is an X-ray generation point of the X-ray tube; and
an anomaly detection unit that detects an anomaly in the X-ray tube on the basis of whether or not the change amount falls within a predetermined normal change range,
wherein the anomaly detection unit includes a comparison unit that compares the change amount with the normal change range correlated with scanning conditions when the change amount is measured, so as to determine the presence or absence of an anomaly in the X-ray tube.

2. The X-ray diagnostic imaging apparatus according to claim 1 , further comprising:
a display control unit that receives a determination result of whether the X-ray tube is normal or abnormal from the comparison unit, and displays the determination result on a display device.

3. The X-ray diagnostic imaging apparatus according to claim 1 ,
wherein the anomaly detection unit further includes a change amount recording unit that records the change amount and scanning conditions when the change amount is measured in correlation with each other.

4. The X-ray diagnostic imaging apparatus according to claim 1 , further comprising:
a storage unit that stores the normal change range in correlation with scanning conditions.

5. The X-ray diagnostic imaging apparatus according to claim 1 ,
wherein the anomaly detection unit further includes an abnormal location specifying unit that specifies an abnormal location on the basis of a period in which the change amount falls within an abnormal change range other than the normal change range when the comparison unit determines that there is an anomaly.

6. The X-ray diagnostic imaging apparatus according to claim 5 ,
wherein the abnormal location specifying unit specifies a cathode of the X-ray tube as an abnormal location in a case where a period in which the change amount falls within the abnormal change range is more than a set threshold value.

7. The X-ray diagnostic imaging apparatus according to claim 5 ,
wherein the abnormal location specifying unit specifies a rotation body support of the X-ray tube as an abnormal location in a case where the change amount vibrates between the normal change range and the abnormal change range.

8. The X-ray diagnostic imaging apparatus according to claim 1 , further comprising:
a service life estimation unit that estimates the service life of the X-ray tube on the basis of a vibration amount of the X-ray focal point.

9. The X-ray diagnostic imaging apparatus according to claim 3 , further comprising:
a rotation disk that is mounted with the X-ray tube and the X-ray detector,
wherein the anomaly detection unit further includes a component separating unit that separates the change amount recorded in correlation with the scanning conditions by the change amount recording unit into a thermal expansion component related to thermal expansion and a centrifugal force component related to centrifugal force.

10. The X-ray diagnostic imaging apparatus according to claim 9 ,
wherein the comparison unit acquires the thermal expansion component and the centrifugal force component of the change amount from the component separating unit, and compares each of the thermal expansion component and the centrifugal force component with the normal change range.

11. A monitoring server connected to the X-ray diagnostic imaging apparatus according to claim 1 via a network,
wherein the monitoring server receives data regarding the change amount or data regarding an output from the anomaly detection unit from the X-ray diagnostic imaging apparatus, and collectively manages the data.

12. The monitoring server according to claim 11 ,
wherein the service life of the X-ray tube is estimated on the basis of the data, and the replacement time of the X-ray tube is planned and displayed on the basis of the estimated service life.

13. The monitoring server according to claim 11 ,
wherein an abnormal location in the X-ray tube is specified on the basis of the data, and a location to be inspected in the X-ray diagnostic imaging apparatus is presented on the basis of the history of the specified abnormal location.

14. An anomaly detection method of detecting an anomaly in an X-ray diagnostic imaging apparatus including an X-ray tube that irradiates an object with X-rays, an X-ray detector that detects X-rays having been transmitted through the object, and an image creation unit that creates a medical image of the object on the basis of the output of the X-ray detector, the method comprising:
a measurement step of measuring a change amount of an X-ray focal point which is an X-ray generation point of the X-ray tube; and
an anomaly detection step of detecting an anomaly in the X-ray tube on the basis of whether or not the change amount falls within a predetermined normal change range,
wherein the anomaly detection step includes a comparison step of comparing the change amount with the normal change range correlated with scanning conditions when the change amount is measured, so as to determine the presence or absence of an anomaly in the X-ray tube.

Assignees

• Hitachi Ltd

Inventors

• Hirayu Takeshi

Classifications

• H05G1/52

  Target size or shape; Direction of electron beam, e.g. in tubes with one anode and more than one cathode · CPC title

• A61B6/4021

  involving movement of the focal spot · CPC title

• A61B6/03

  Computed tomography [CT] · CPC title

• H01J35/14

  Arrangements for concentrating, focusing, or directing the cathode ray · CPC title

• A61B6/586 Primary

  Detection of faults or malfunction of the device · CPC title