Patents by Inventor Xuejin LIU
Xuejin LIU has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10610191Abstract: Disclosed is a method for management of geometric misalignment in an x-ray imaging system having an x-ray source, a photon-counting x-ray detector and an intermediate collimator structure in the x-ray path between the x-ray source and the x-ray detector. The x-ray detector includes a plurality of pixels, and the collimator structure includes a plurality of collimator cells, wherein each of at least a subset of the collimator cells corresponds to a N×M matrix of pixels, where at least one of N and M is greater than one. The method includes monitoring, for a designated subset of pixels including at least two pixels that are affected differently by shadowing from the collimator structure due to geometric misalignment, output signals from the pixels of the designated subset, and determining the occurrence of geometric misalignment based on the monitored output signals from the pixels of the designated subset of pixels.Type: GrantFiled: July 6, 2017Date of Patent: April 7, 2020Assignee: PRISMATIC SENSORS ABInventors: Martin Sjolin, Xuejin Liu, Mats Danielsson
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Patent number: 10575801Abstract: A photon-counting detector includes a first subset of detector modules and at least one second subset of detector modules. Each detector module has power-consuming circuitry. Power-consuming circuitry of detector modules in the first subset is configured, in an operational mode in which the detector modules are powered on, to consume a first amount of power. Correspondingly, power-consuming circuitry of detector modules in the at least one second subset is configured, in the operational mode, to consume a second amount of power that is lower than the first amount of power.Type: GrantFiled: June 8, 2017Date of Patent: March 3, 2020Assignee: PRISMATIC SENSORS ABInventors: Mats Danielsson, Staffan Karlsson, Xuejin Liu, Martin Sjölin, Anders Björklid, Torbjörn Hjärn
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Patent number: 10379233Abstract: An X-ray detector system includes a photon-counting detector with multiple detector modules including a respective power-consuming circuitry. At least some of the detector modules include a temperature sensor to monitor a temperature on the detector module and generate a temperature representing signal. A detector controller selectively switches, for at least a subset of the detector modules, the detector modules between an idle mode in which at least a respective part of the detector modules is powered off and an operational mode in which the detector modules are powered on. The power-consuming circuitries of the at least a subset of detector modules generate calibration data based on the temperature representing signals to correct for any temperature-induced changes to image data generated by the photon-counting detector.Type: GrantFiled: April 11, 2017Date of Patent: August 13, 2019Assignee: PRISMATIC SENSORS ABInventors: Mats Danielsson, Staffan Karlsson, Xuejin Liu
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Publication number: 20190008474Abstract: Disclosed is a method for management of geometric misalignment in an x-ray imaging system having an x-ray source, a photon-counting x-ray detector and an intermediate collimator structure in the x-ray path between the x-ray source and the x-ray detector. The x-ray detector includes a plurality of pixels, and the collimator structure includes a plurality of collimator cells, wherein each of at least a subset of the collimator cells corresponds to a N×M matrix of pixels, where at least one of N and M is greater than one. The method includes monitoring, for a designated subset of pixels including at least two pixels that are affected differently by shadowing from the collimator structure due to geometric misalignment, output signals from the pixels of the designated subset, and determining the occurrence of geometric misalignment based on the monitored output signals from the pixels of the designated subset of pixels.Type: ApplicationFiled: July 6, 2017Publication date: January 10, 2019Inventors: Martin SJOLIN, Xuejin LIU, Mats DANIELSSON
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Patent number: 10143417Abstract: There is provided an arrangement (100) for enabling assessment of scoliosis. The arrangement (100) is configured to obtain at least one x-ray image by means of one or more photon-counting x-ray detectors. The arrangement (100) is further configured to determine at least one characteristic of the spine of a patient having possible scoliosis based on said at least one x-ray image obtained by means of the photon-counting x-ray detector(s) to enable assessment of scoliosis.Type: GrantFiled: February 13, 2017Date of Patent: December 4, 2018Assignee: PRISMATIC SENSORS ABInventors: Mats Danielsson, Xuejin Liu, Martin Sjolin
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Publication number: 20180292551Abstract: An X-ray detector system includes a photon-counting detector with multiple detector modules including a respective power-consuming circuitry. At least some of the detector modules include a temperature sensor to monitor a temperature on the detector module and generate a temperature representing signal. A detector controller selectively switches, for at least a subset of the detector modules, the detector modules between an idle mode in which at least a respective part of the detector modules is powered off and an operational mode in which the detector modules are powered on. The power-consuming circuitries of the at least a subset of detector modules generate calibration data based on the temperature representing signals to correct for any temperature-induced changes to image data generated by the photon-counting detector.Type: ApplicationFiled: April 11, 2017Publication date: October 11, 2018Inventors: Mats DANIELSSON, Staffan KARLSSON, Xuejin LIU
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Publication number: 20180042562Abstract: A photon-counting detector includes a first subset of detector modules and at least one second subset of detector modules. Each detector module has power-consuming circuitry. Power-consuming circuitry of detector modules in the first subset is configured, in an operational mode in which the detector modules are powered on, to consume a first amount of power. Correspondingly, power-consuming circuitry of detector modules in the at least one second subset is configured, in the operational mode, to consume a second amount of power that is lower than the first amount of power.Type: ApplicationFiled: June 8, 2017Publication date: February 15, 2018Inventors: Mats DANIELSSON, Staffan KARLSSON, Xuejin LIU, Martin SJÖLIN, Anders BJÖRKLID, Torbjörn HJÄRN
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Patent number: 9867580Abstract: There is provided a method and corresponding system and apparatus for image reconstruction based on image data from a photon-counting multi-bin x-ray detector. The method includes determining (S1) parameter(s) of a given functional form of the relationship between comparator settings expressed in voltage in the read-out chain of the x-ray detector and the corresponding energy threshold values expressed in energy based on a fitting procedure between a first set of data representative of a measured pulse height spectrum and a second set of data representative of a reference pulse height spectrum. The method also includes performing (S2) image reconstruction based on the image data and the determined parameter(s). In this way, efficient high-quality image reconstruction can be achieved.Type: GrantFiled: November 10, 2014Date of Patent: January 16, 2018Assignee: PRISMATIC SENSORS ABInventors: Mats Danielsson, Hans Bornefalk, Xuejin Liu, Ben Huber, Han Chen
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Publication number: 20170340268Abstract: There is provided an arrangement (100) for enabling assessment of scoliosis. The arrangement (100) is configured to obtain at least one x-ray image by means of one or more photon-counting x-ray detectors. The arrangement (100) is further configured to determine at least one characteristic of the spine of a patient having possible scoliosis based on said at least one x-ray image obtained by means of the photon-counting x-ray detector(s) to enable assessment of scoliosis.Type: ApplicationFiled: February 13, 2017Publication date: November 30, 2017Inventors: Mats DANIELSSON, Xuejin LIU, Martin SJOLIN
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Publication number: 20170273640Abstract: There is provided a method and corresponding system and apparatus for image reconstruction based on image data from a photon-counting multi-bin x-ray detector. The method includes determining (S1) parameter(s) of a given functional form of the relationship between comparator settings expressed in voltage in the read-out chain of the x-ray detector and the corresponding energy threshold values expressed in energy based on a fitting procedure between a first set of data representative of a measured pulse height spectrum and a second set of data representative of a reference pulse height spectrum. The method also includes performing (S2) image reconstruction based on the image data and the determined parameter(s). In this way, efficient high-quality image reconstruction can be achieved.Type: ApplicationFiled: November 10, 2014Publication date: September 28, 2017Inventors: Mats DANIELSSON, Hans BORNEFALK, Xuejin LIU, Ben HUBER, Han CHEN