Supplementary system for interferometric x-ray imaging and projective x-ray device
View Patent ↗An X-ray device and a supplementary system are provided for interferometric X-ray imaging of a patient on the X-ray device in order to generate projective absorption recordings. An emitter-detector system includes a focus-forming X-ray tube and a digital flat-panel detector having a multiplicity of pixel-generating detector elements. A computer system has a program memory. A mobile grating attachment includes a first interferometric X-ray grating, a second interferometric X-ray grating disposed at a distance from the first X-ray grating in the radiation direction, and a displacement device for displacing the second X-ray grating in the plane of the second X-ray grating in steps over at least one detector element.
1. In an x-ray apparatus for generating projective absorption records, including an emitter-detector system having an x-ray tube forming a focus and defining a radiation direction and a digital flat-panel detector with a multiplicity of pixel-generating detector elements, and a computer system having a program memory, a supplementary system for interferometric x-ray imaging of a patient at the x-ray apparatus, the supplementary system comprising:
a mobile grating attachment including:
a first interferometric x-ray grating,
a second interferometric x-ray grating disposed at a distance from said first x-ray grating in the radiation direction and defining a plane of said second x-ray grating, and
a displacement device for displacing said second x-ray grating in steps in said plane of said second x-ray grating over at least one of the detector elements;
a position detection system attached to at least one of said mobile grating attachment or said flat-panel detector;
a position representation system for indicating a region covered by the supplementary system directly on a patient or on an image representation of a Patient; and
a non-transitory computer program to be stored and executed in the computer system for controlling the supplementary system and creating at least one interferometric x-ray image.
2. The supplementary system according to claim 1 , which further comprises a grating front attachment having an absorption grating and being attached to said x-ray tube.
3. The supplementary system according to claim 2 , which further comprises an absorption grating being movably disposed in said grating front attachment.
4. The supplementary system according to claim 1 , wherein said mobile grating attachment is configured for direct attachment to said flat-panel detector.
5. The supplementary system according to claim 1 , wherein said position detection system has position sensors integrated into said flat-panel detector and position encoders in said mobile grating attachment.
6. The supplementary system according to claim 1 , which further comprises a device attached in a vicinity of said x-ray tube for generating light marks, said light marks projecting the position of said mobile grating attachment onto an examination object.
7. The supplementary system according to claim 1 , wherein:
said computer program is executed by said computer to perform a method for marking a region of particular interest in a previously recorded projective x-ray absorption image of the patient; and
a device for generating light marks depicts the region on said flat-panel detector, permitting said mobile grating attachment to be positioned for generating at least one interferometric x-ray image representation of the region selected from the group consisting of a phase image, a differential phase image, a dark-field image and an absorption image.
8. An x-ray device for projective absorption imaging, the x-ray device comprising:
an emitter-detector system including an x-ray tube forming a focus and a digital flat-panel detector having a multiplicity of pixel-generating detector elements;
a computer system including a program memory; and
a supplementary system according to claim 1 for additionally generating at least one interferometric x-ray image representation selected from the group consisting of a phase image, a differential phase image, a dark-field image and an absorption image.
9. The x-ray device according to claim 8 , wherein the x-ray device is a mammography system, a C-arm system or a thorax x-ray apparatus with a wall stand.
10. An x-ray device for projective absorption imaging, the x-ray device comprising:
an emitter-detector system including an x-ray tube forming a focus and a digital flat-panel detector having a multiplicity of pixel-generating detector elements;
a computer system including a program memory;
a supplementary system for additionally generating at least one interferometric x-ray image representation selected from the group consisting of a phase image, a differential phase image, a dark-field image and an absorption image, said supplementary system having a mobile grating attachment including:
a first interferometric x-ray grating,
a second interferometric x-ray grating disposed at a distance from said first x-ray grating in the radiation direction and defining a plane of said second x-ray grating, and
a displacement device for displacing said second x-ray grating in steps in said plane of said second x-ray grating over at least one of the detector elements;
a non-transitory computer program to be stored and executed in the computer system for controlling said supplementary system and creating at least one interferometric x-ray image; and
an automatic positioning device attached to said flat-panel detector for positioning said mobile grating attachment, said positioning device positioning said mobile grating attachment in accordance with preceding entries on a previously recorded absorption record.