Patent ID: 9247914
Filing Date: 2016-02-02
CPC Classification: A61B,H05G

Claim Text:
1. An X-ray imaging apparatus comprising: an X-ray generation unit that irradiates X-rays from a focus and that has a first portion changing so as to have a first change component and a second portion changing so as to have a second change component, which is different from the first change component, due to heat generated by the X-ray generation unit; an X-ray detection unit that detects the X-rays and converts the detected X-rays into electrical signals; a focus position detection unit that detects a focus position when the X-rays are irradiated; a focus position change amount estimation unit that estimates an amount of change in the focus position with respect to a reference position of the focus using a first amount of change, which changes so as to have the first change component, and a second amount of change, which changes so as to have the second change component; and a correction unit that corrects relative positions of an irradiation region of the X-rays and the X-ray detection unit so as to cancel the amount of change in the focus position estimated by the focus position change amount estimation unit; wherein the focus position change amount estimation unit estimates the amount of change in the focus position using an estimation function obtained from a sum of a first term for calculating the first amount of change and a second term for calculating the second amount of change; wherein the first term is defined by one or more attenuation terms using the first change component and a first amplitude term, and the second term is defined by one or more attenuation terms using the second change component and a second amplitude term.