# US 2018/0322664 A1 · Adaptive method for generating artifact-reduced ct image data > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0322664 A1 - Document ID: US20180322664A1 - Status: Published application - Kind: A1 - Application number: 15/963,392 - Filed: 2018-04-26 - Published: 2018-11-08 - Earliest claimed: 2017-05-03 - Assignees: Siemens Healthcare GmbH - Applicants: Siemens Healthcare GmbH - Inventors: Ute FEUERLEIN; Christian HOFMANN; Robert MAYER; Rainer RAUPACH; Grzegorz SOZA - Web page: https://patentgrep.com/patent/US20180322664A1 ## CPC - G06T 12/00: Tomographic reconstruction from projections - A61B 6/5258: {involving detection or reduction of artifacts or noise} - G06T 7/0012: {Biomedical image inspection} - G06T 11/008 - G06T 12/30: Image post-processing, e.g. metal artefact correction - A61B 6/032: {Transmission computed tomography [CT]} - G06T 2207/10081: Computed x-ray tomography [CT] - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract An adaptive method for generating CT image data is described. In the method, projection measurement data of an examination region of an examination object is acquired. Furthermore, uncorrected image data of the examination region is generated. Artifact-affected subregions of the examination region are determined on the basis of at least one part of the uncorrected image data. An artifact-reduced image reconstruction is carried out in the artifact-affected subregions of the examination region. Only artifact-reduced subimage data of the artifact-affected subregions is generated. Finally, artifact-reduced image data of the entire examination region is generated by combining at least one part of the uncorrected image data and the artifact-reduced subimage data. A reconstruction device is also described. Moreover, a computed tomography system is described. ## Claims ### Claim 1 An adaptive method for generating CT image data, comprising: acquiring projection measurement data of an examination region of an examination object; generating uncorrected image data of the examination region; determining artifact-affected subregions of the examination region based upon at least one part of the uncorrected image data; carrying out an artifact-reduced image reconstruction in the artifact-affected subregions of the examination region, only artifact-reduced subimage data of the artifact-affected subregions being generated; and generating artifact-reduced image data of an entirety of the examination region by combining at least one part of the uncorrected image data and the artifact-reduced subimage data. ### Claim 2 (depends on 1) The method of claim 1, wherein in the generating of the uncorrected image data, uncorrected image data is reconstructed based upon the projection measurement data acquired and at least one part of the reconstructed, uncorrected image data is combined with the artifact-reduced sub image data in the generating of the artifact-reduced image data. ### Claim 3 (depends on 1) The method of claim 1, wherein the uncorrected image data includes at least one of topogram image data and real-time image data. ### Claim 4 (depends on 1) The method of claim 1, wherein, in generating the artifact-reduced image data, only the uncorrected image data from artifact-free subregions is used. ### Claim 5 (depends on 1) The method of claim 1, wherein the determining of the artifact-affected subregions includes: determining whether metal objects are located in the examination region, and determining the artifact-affected subregions of the examination region in which the metal objects are located. ### Claim 6 (depends on 3) The method of claim 3, wherein the artifact-affected subregions are determined based upon at least one of the real-time image data and the topogram image data. ### Claim 7 (depends on 3) The method of claim 3, wherein potential subregions, which may be artifact-affected, are determined in advance via at least one of the real-time image data and the topogram image data and wherein artifact-affected subregions are determined based upon reconstructed, uncorrected image data, assigned to the potential subregions determined. ### Claim 8 (depends on 3) The method of claim 3, wherein at least one of the real-time image data and the topogram image data is used in determining whether or not to perform an artifact-affected reconstruction. ### Claim 9 (depends on 8) The method of claim 8, wherein, after reconstruction for the generating of the artifact-reduced image data, reconstructed, uncorrected image data is buffered only in an event of a determination that an artifact reduction has to be carried out. ### Claim 10 (depends on 1) The method of claim 1, wherein with an internal data transmission between an image data reconstruction device used to reconstruct the artifact-reduced image data and an image display device per image display, only one data record, including the artifact-reduced image data, is transmitted. ### Claim 11 An image data reconstruction device, comprising: an input interface to acquire projection measurement data of an examination region of an examination object; a reconstruction unit to reconstruct uncorrected image data based upon the projection measurement data; a subregion determination unit to determine artifact-affected subregions of the examination region based upon uncorrected image data; a correction unit to carry out an artifact-reduced image reconstruction in the artifact-affected subregions of the examination region, only artifact-reduced subimage data of the artifact-affected subregions being generated; and an image generation unit to generate artifact-reduced image data of an entirety of the examination region by combining at least one part of the uncorrected image data and the artifact-reduced subimage data. ### Claim 12 (depends on 11) A computed tomography system, comprising: a scanner unit to capture a region, to be examined, of an examination object; a control device to control the scanner unit; and the image data reconstruction device of claim 11. ### Claim 13 (depends on 1) A non-transitory computer program product storing a computer program, directly loadable into a computing unit of a computed tomography system, including program portions to carry out the method of claim 1 when the computer program is executed in the computing unit. ### Claim 14 (depends on 1) A non-transitory computer-readable medium storing executable program portions, configured to be executable by a computer unit to carry out the method of claim 1 when the program portions are executed by the computer unit. ### Claim 15 (depends on 1) The method of claim 1, wherein the uncorrected image data includes at least one of topogram image data and real-time image data. ### Claim 16 (depends on 2) The method of claim 2, wherein, in generating the artifact-reduced image data, only the uncorrected image data from artifact-free subregions is used. ### Claim 17 (depends on 3) The method of claim 3, wherein, in generating the artifact-reduced image data, only the uncorrected image data from artifact-free subregions is used. ### Claim 18 (depends on 4) The method of claim 4, wherein the uncorrected image data includes at least one of topogram image data and real-time image data and wherein the artifact-affected subregions are determined based upon at least one of the real-time image data and the topogram image data. ### Claim 19 (depends on 4) The method of claim 4, wherein the uncorrected image data includes at least one of topogram image data and real-time image data and wherein potential subregions, which may be artifact-affected, are determined in advance via at least one of the real-time image data and the topogram image data and wherein artifact-affected subregions are determined based upon reconstructed, uncorrected image data, assigned to the potential subregions determined. ### Claim 20 (depends on 4) The method of claim 4, wherein the uncorrected image data includes at least one of topogram image data and real-time image data and wherein at least one of the real-time image data and the topogram image data is used in determining whether or not to perform an artifact-affected reconstruction. ### Claim 21 (depends on 5) The method of claim 5, wherein the uncorrected image data includes at least one of topogram image data and real-time image data and wherein the artifact-affected subregions are determined based upon at least one of the real-time image data and the topogram image data. ### Claim 22 (depends on 5) The method of claim 5, wherein the uncorrected image data includes at least one of topogram image data and real-time image data, wherein potential subregions, which may be artifact-affected, are determined in advance via at least one of the real-time image data and the topogram image data and wherein artifact-affected subregions are determined based upon reconstructed, uncorrected image data, assigned to the potential subregions determined. ### Claim 23 (depends on 5) The method of claim 5, wherein the uncorrected image data includes at least one of topogram image data and real-time image data and wherein at least one of the real-time image data and the topogram image data is used in determining whether or not to perform an artifact-affected reconstruction. ### Claim 24 An image data reconstruction device, comprising: an input interface to acquire projection measurement data of an examination region of an examination object; and a processor, configured to reconstruct uncorrected image data based upon the projection measurement data, determine artifact-affected subregions of the examination region based upon uncorrected image data, carry out an artifact-reduced image reconstruction in the artifact-affected subregions of the examination region, only artifact-reduced subimage data of the artifact-affected subregions being generated, and generate artifact-reduced image data of an entirety of the examination region by combining at least one part of the uncorrected image data and the artifact-reduced subimage data. ### Claim 25 (depends on 24) A computed tomography system, comprising: a scanner unit to capture a region, to be examined, of an examination object; a control device to control the scanner unit; and the image data reconstruction device of claim 24.