Determination of an X-ray image data record of a moving target location
View Patent ↗A method and apparatus for determining an x-ray image data record of a target location subjected to a movement using an x-ray device. A number of basic images of the target location are recorded using a basic exposure time in each case and the x-ray image data record corresponding to an x-ray image with a longer exposure time is determined by combining basic images registered with one another. At least one quality value assigned hereto and relating to the movement in the target location during the recording is determined for each basic image and the contribution of a basic image to the x-ray image data record is determined as a function of the quality value.
1. A method for determining an x-ray image data record of a target location of a patient subjected to a movement using an x-ray device, the method comprising:
recording a plurality of component images of the target location using an image exposure time;
registering the plurality of component images with one another;
determining one or more quality values related to the movement of the target for each component image of the plurality of component images, the one or more quality values including at least a motion speed calculated as a comparison between a spread function of at least two or more of the plurality of component images and a reference spread function of the x-ray device;
selecting as a function of the one or more quality values a contribution of one or more basic images of the plurality of component images; and
combining the one or more component images into the x-ray image data record as a function of the selected contribution of the one or more component images.
2. The method as claimed in claim 1 , wherein the one or more quality values further includes an exclusion criterion, wherein basic images fulfilling the exclusion criterion are not selected until undergoing a correction process.
3. The method as claimed in claim 2 , wherein the correction process includes a deblurring algorithm.
4. The method as claimed in claim 2 , further comprising:
determining a point spread function for the movement from the movement or movement data describing a comparable movement, wherein the correction process includes is regularized, inverse filtering with the point spread function.
5. The method as claimed in claim 2 , wherein at least one criterion parameter of the exclusion criterion is selected on the basis of a user requirement.
6. The method as claimed in claim 5 , further comprising:
generating an updated x-ray image data record using a different criterion parameter.
7. The method as claimed in claim 1 , wherein combining the x-ray image data record comprises:
combining the one or more component images to be used; wherein the component images are weighted as a function of the contribution.
8. The method as claimed in claim 1 , wherein determining one or more quality values further comprises:
determining at least one sharpness parameter describing a sharpness of the mapping of a feature of the target location.
9. The method as claimed in claim 8 , wherein the sharpness value is determined as a parameter of a line spread function.
10. The method as claimed in claim 1 , wherein the image exposure time is defined as a function of the movement.
11. The method as claimed in claim 1 , further comprising:
triggering the recording of the component images by using an EKG measuring device.