# US 2010/0166138 A1 · X-ray ct apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0166138 A1 - Document ID: US20100166138A1 - Status: Published application - Kind: A1 - Application number: 12/645,155 - Filed: 2009-12-22 - Published: 2010-07-01 - Earliest claimed: 2008-12-26 - Inventors: Xiongwei Yan - Web page: https://patentgrep.com/patent/US20100166138A1 ## CPC - A61B 6/032: {Transmission computed tomography [CT]} - A61B 6/4028: {resulting in acquisition of views from substantially different positions, e.g. EBCT} - A61B 6/0487: {Motor-assisted positioning} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract An X-ray CT apparatus includes an X-ray irradiator which irradiates fan-beam X-rays; a multi-channel X-ray detector disposed to face the X-ray irradiator; a transmitted X-ray data collection device which scans a subject while rotating the X-ray irradiator and the X-ray detector to collect transmitted X-ray data of two or more views; a scan control device which controls the scan; and an image reconstruction device which reconstructs an image. The X-ray irradiator irradiates fan-beam X-rays which are deflected to one side of the center of rotation, the X-ray detector has the number of channels to cope with a spread of the fan-beam X-rays, and the scan control device allows the X-ray irradiator and the X-ray detector to conduct a scan of at least one rotation. ## Claims ### Claim 1 An X-ray CT apparatus comprising: an X-ray irradiator configured to irradiate fan-beam X-rays; a multi-channel X-ray detector disposed to face said X-ray irradiator; a transmitted X-ray data collection device configured to collect transmitted X-ray data of two or more views by performing a scan of a subject while rotating said X-ray irradiator and said X-ray detector; a scan control device configured to control the scan; and an image reconstruction device configured to reconstruct an image based on the transmitted X-ray data, wherein said X-ray irradiator is configured to irradiate fan-beam X-rays deflected to one side of the center of rotation, said X-ray detector comprises a plurality of channels to cope with a spread of the fan-beam X-rays, said scan control device is configured to enable said X-ray irradiator and said X-ray detector to conduct a scan of at least one rotation. ### Claim 2 (depends on 1) An X-ray CT apparatus according to claim 1, wherein said X-ray irradiator is configured to irradiate fan-beam X-rays having a central beam that is deflected to one side by an angle equivalent to 1/n of a fan angle relative to the center of the scan in a plane of the fan beam. ### Claim 3 (depends on 2) An X-ray CT apparatus according to claim 2, wherein the central beam is deflected to one side by an angle equivalent to ½ of the fan angle relative to the center of the scan in the plane of the fan beam. ### Claim 4 (depends on 1) An X-ray CT apparatus according to claim 1, wherein said scan control device comprises a control device configured to control X-ray irradiation by said X-ray irradiator in two or more different relative positional relationship between said X-ray irradiator and said X-ray detector, said image reconstruction device is configured to reconstruct the image based on a combination of the transmitted X-ray data at the two or more different relative positions collected by said transmitted X-ray data collection device. ### Claim 5 (depends on 4) An X-ray CT apparatus according to claim 4, wherein said scan control device is configured to adjust, in relation to each view, positions of an X-ray focal point of said X-ray irradiator in a scanning trajectory to be the same with respect before the amount of rotation of the scan becomes equivalent to half of a channel pitch of said X-ray detector and after the amount of rotation of the scan becomes equivalent to half of the channel pitch of said X-ray detector. ### Claim 6 (depends on 5) An X-ray CT apparatus according to claim 5, wherein said scan control device is configured to adjust positions of the X-ray focal point by flying focus. ### Claim 7 (depends on 5) An X-ray CT apparatus according to claim 5, wherein said image reconstruction device is configured to reconstruct the image based on a combination of transmitted X-ray data obtained when adjusting said positions of the X-ray focal point in respective views. ### Claim 8 (depends on 7) An X-ray CT apparatus according to claim 7, wherein said combination of the transmitted X-ray data is the one being interleaved. ### Claim 9 (depends on 1) An X-ray CT apparatus according to claim 1, wherein said X-ray detector is disposed such that it is offset toward channels. ### Claim 10 (depends on 9) An X-ray CT apparatus according to claim 9, wherein said offset is a 1/n offset. ### Claim 11 (depends on 10) An X-ray CT apparatus according to claim 10, wherein said offset is a ¼ offset. ### Claim 12 (depends on 1) An X-ray CT apparatus according to claim 1, wherein said X-ray irradiator comprises a collimator configured to form deflected fan-beam X-rays. ### Claim 13 (depends on 12) An X-ray CT apparatus according to claim 12, wherein said collimator further comprises an X-ray blocking material which has an aperture for X-rays to pass through. ### Claim 14 (depends on 1) An X-ray CT apparatus according to claim 1, wherein said X-ray irradiator comprises a filter for the deflected fan-beam X-rays. ### Claim 15 (depends on 14) An X-ray CT apparatus according to claim 14, wherein said filter corresponds to one side of a bowtie filter. ### Claim 16 (depends on 1) An X-ray CT apparatus according to claim 1, wherein the subject is supported on a table top which is configured to move vertically by swing of a support. ### Claim 17 (depends on 1) An X-ray CT apparatus according to claim 1, wherein the subject is supported on a table top which is configured to move vertically by extension and contraction of a support. ### Claim 18 (depends on 1) An X-ray CT apparatus according to claim 1, wherein said scan control device allows axial scanning to be conducted. ### Claim 19 (depends on 1) An X-ray CT apparatus according to claim 1, wherein said scan control device allows helical scanning to be conducted. ### Claim 20 (depends on 1) An X-ray CT apparatus according to claim 1, wherein said scan control device allows cluster scanning to be conducted.