# US 10,504,634 B2 · Method and device for setting a spatial intensity distribution of an X-ray beam > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,634 B2 - Document ID: US10504634B2 - Status: Granted - Kind: B2 - Application number: 15/652,406 - Filed: 2017-07-18 - Published: 2018-02-01 - Granted: 2019-12-10 - Earliest claimed: 2016-07-29 - Assignees: Siemens Healthcare GmbH - Applicants: Siemens Healthcare GmbH - Inventors: Karl Stierstorfer - Web page: https://patentgrep.com/patent/US10504634B2 ## CPC - G21K 1/10: Scattering devices; Absorbing devices; Ionising radiation filters - A61B 6/032: {Transmission computed tomography [CT]} - A61B 6/06: Diaphragms - A61B 6/4035: {the source being combined with a filter or grating} - G21K 1/025: {using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation} - G21K: HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract In a method and device for setting a spatial intensity distribution of an X-ray beam, an X-ray beam is generated by an X-ray tube. A beam path of the X-ray beam is guided in a direction of propagation by a form filter including a plurality of lamella plates which taper to a focal point such that, for each of the lamella plates, at least one straight line running through the respective lamella plate and forming a first direction of the lamella plate is aligned with the focal point. The first directions of the lamella plates of the form filter are aligned relative to the beam path. As a result of the alignment, parts of the X-ray beam are absorbed. Finally, the spatial intensity distribution of the X-ray beam is set in the direction of propagation by the absorption due to the lamella plates. ## Claims ### Claim 1 A method for setting a spatial intensity distribution of an X-ray beam, comprising: generating an X-ray beam via an X-ray tube; guiding a beam path of the X-ray beam in a direction of propagation by a form filter including a plurality of lamella plates which taper to a focal point such that, for each respective lamella plate of the plurality of lamella plates, at least one straight line running through each respective lamella plate and forming a first direction of the lamella plate is aligned with the focal point; aligning the first directions of the plurality of lamella plates of the form filter relative to the beam path, parts of the X-ray beam being absorbed as a result of the aligning of the first directions by the lamella plates; and setting the spatial intensity distribution of the X-ray beam in a direction of propagation established by the absorption of the parts of the X-ray beam due to the aligning of the first directions by the lamella plates. ### Claim 2 (depends on 1) The method of claim 1, further comprising: generating at least some of X-ray radiation of the X-ray beam at a generation point in the X-ray tube, wherein the spatial intensity distribution is set with the first directions of the plurality of lamella plates being each respectively aligned in respect of the generation point. ### Claim 3 (depends on 2) The method of claim 2, further comprising: defining an initial position of the form filter by the alignment of the first directions of the plurality of lamella plates with the generation point, wherein the spatial intensity distribution, including a maximum intensity, is set by the form filter in the initial position. ### Claim 4 (depends on 3) The method of claim 3, wherein due to an axial displacement of the form filter from at least one of the initial position in respect of the generation point and due to a rotation of the form filter while maintaining alignment of at least one of the first directions of a lamella plate with the generation point, the intensity is reduced by outer border regions of the form filter. ### Claim 5 (depends on 4) The method of claim 4, wherein the intensity over an entire region of the form filter is reduced by a rotation of the form filter without maintaining the alignment of a first direction of one of the plurality of lamella plates with the generation point. ### Claim 6 (depends on 3) The method of claim 3, wherein the intensity over an entire region of the form filter is reduced by a rotation of the form filter without maintaining alignment of a first direction of one of the plurality of lamella plates with the generation point. ### Claim 7 (depends on 2) The method of claim 2, wherein due to an axial displacement of the form filter due to a rotation of the form filter while maintaining alignment of at least one of the first directions of a lamella plate with the generation point, the intensity is reduced by outer border regions of the form filter. ### Claim 8 (depends on 7) The method of claim 7, wherein the intensity over an entire region of the form filter is reduced by a rotation of the form filter without maintaining the alignment of a first direction of one of the plurality of lamella plates with the generation point. ### Claim 9 A device for setting a spatial intensity distribution of an X-ray beam, comprising: a form filter including a plurality of lamella plates which taper to a focal point such that, for each of the plurality of lamella plates, at least one straight line running through a respective one of the plurality of lamella plates, and forming a first direction of the respective one of the plurality of lamella plates, is aligned with the focal point; and a control unit configured to set, via an alignment of the first directions of the plurality of lamella plates of the form filter relative to a path of the X-ray beam to absorb parts of the X-ray beam by the plurality of lamella plates, the spatial intensity distribution of the X-ray beam. ### Claim 10 (depends on 9) The device of claim 9, wherein the plurality of lamella plates are designed and aligned such that a second direction is definable in each of the plurality of lamella plates, perpendicular to the first direction, using a straight line running through a respective one of each of the plurality of lamella plates, and wherein for each pair of lamella plates, of the plurality of lamella plates, the respective second directions are parallel to each other. ### Claim 11 (depends on 10) The device of claim 10, wherein the plurality of lamella plates describe circumferential surfaces of a set of concentric truncated cones. ### Claim 12 (depends on 9) The device of claim 9, further comprising: a second plurality of lamella plates which taper to the focal point such that, for each of the second plurality of lamella plates, at least one straight line, running through a respective one of the plurality of second lamella plates and forming a first direction of the respective one of the plurality of second lamella plates, is aligned with the focal point, and wherein the plurality of lamella plates intersect the second plurality of lamella plates. ### Claim 13 (depends on 12) The device of claim 12, wherein the plurality of lamella plates describe circumferential surfaces of a set of concentric truncated cones. ### Claim 14 (depends on 9) The device of claim 9, wherein the plurality of lamella plates describe circumferential surfaces of a set of concentric truncated cones. ### Claim 15 A method for setting a spatial absorption profile of an X-ray beam, comprising: generating an X-ray beam via an X-ray tube; guiding a beam path of the X-ray beam in a direction of propagation by a form filter including a plurality of lamella plates which taper to a focal point such that, for each respective lamella plate of the plurality of lamella plates, at least one straight line running through each respective lamella plate and forming a first direction of the lamella plate is aligned with the focal point; aligning the first directions of the plurality of lamella plates of the form filter relative to the beam path, parts of the X-ray beam being absorbed as a result of the aligning of the first directions by the lamella plates; and setting the spatial absorption profile of the X-ray beam in a direction of propagation established by absorption of the parts of the X-ray beam due to the aligning of the first directions by the plurality of lamella plates. ### Claim 16 A device for setting a spatial absorption profile of an X-ray beam, comprising: a form filter including a plurality of lamella plates which taper to a focal point such that, for each of the plurality of lamella plates, at least one straight line running through a respective one of the plurality of lamella plates, and forming a first direction of the respective one of the plurality of lamella plates, is aligned with the focal point; and a control unit configured to set, via an alignment of the first directions of the plurality of lamella plates of the form filter relative to a path of the X-ray beam to absorb parts of the X-ray beam by the plurality of lamella plates, the spatial absorption profile of the X-ray beam. ### Claim 17 (depends on 16) The device of claim 16, wherein the plurality of lamella plates are designed and aligned such that a second direction is definable in each of the plurality of lamella plates, perpendicular to the first direction, using a straight line running through a respective one of each of the plurality of lamella plates, and wherein for each pair of lamella plates, of the plurality of lamella plates, the respective second directions are parallel to each other. ### Claim 18 (depends on 16) The device of claim 16, further comprising: a second plurality of lamella plates which taper to the focal point such that, for each of the second plurality of lamella plates, at least one straight line, running through a respective one of the plurality of second lamella plates and forming a first direction of the respective one of the plurality of second lamella plates, is aligned with the focal point, and wherein the plurality of lamella plates intersect the second plurality of lamella plates. ### Claim 19 (depends on 16) The device of claim 16, wherein the plurality of lamella plates describe circumferential surfaces of a set of concentric truncated cones.