公开(公告)号：WO2019009784A1

公开(公告)日：2019-01-10

申请号：PCT/SE2018/050660

申请日：2018-06-20

Applicant: PRISMATIC SENSORS AB

Inventor： DANIELSSON, Mats ,  LIU, Xuejin ,  SJÖLIN, Martin

IPC: G01T1/24 ,  A61B6/03 ,  G01N23/04 ,  G01T1/29

Abstract: There is provided 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 comprises a plurality of pixels, and the collimator structure comprises a plurality of collimator cells, wherein each of at least a subset of the collimator cells corresponds to a N x M matrix of pixels, where at least one of N and M is greater than one. The method comprises monitoring (S1), 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 of pixels, and determining (S2) the occurrence of geometric misalignment based on the monitored output signals from the pixels of the designated subset of pixels.

公开(公告)号：WO2018190760A1

公开(公告)日：2018-10-18

申请号：PCT/SE2018/050209

申请日：2018-03-06

Applicant: PRISMATIC SENSORS AB

Inventor： DANIELSSON, Mats ,  KARLSSON, Staffan ,  LIU, Xuejin

IPC: G01T1/24 ,  A61B6/03 ,  G01N23/04 ,  G01N23/083 ,  G01T1/36

Abstract: An X-ray detector system comprises a photon-counting detector (20) with multiple detector modules comprising a respective power-consuming circuitry (30). At least some of the detector modules comprises 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 (30) 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 (20).

公开(公告)号：WO2017209662A1

公开(公告)日：2017-12-07

申请号：PCT/SE2016/050497

申请日：2016-05-30

Applicant: PRISMATIC SENSORS AB

Inventor： DANIELSSON, Mats ,  LIU, Xuejin ,  SJÖLIN, Martin

IPC: A61B6/00 ,  G03B42/02

Abstract: 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.

Abstract translation: 提供了用于评估脊柱侧凸的装置（100）。 该装置（100）被配置成通过一个或多个光子计数X射线探测器获得至少一个X射线图像。 装置（100）还被配置为基于通过光子计数X射线探测器获得的所述至少一个X射线图像来确定具有可能的脊柱侧凸的患者的脊柱的至少一个特征， 评估脊柱侧凸。

公开(公告)号：WO2016076767A1

公开(公告)日：2016-05-19

申请号：PCT/SE2014/051330

申请日：2014-11-10

Applicant: PRISMATIC SENSORS AB

Inventor： DANIELSSON, Mats ,  BORNEFALK, Hans ,  LIU, Xuejin ,  HUBER, Ben ,  CHEN, Han

IPC: G06T11/00 ,  A61B6/03 ,  G01N23/04

CPC classification number: A61B6/03 ,  A61B6/42 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/5205 ,  A61B6/583 ,  A61B6/585 ,  G01N23/04 ,  G01N23/087 ,  G01N2223/206 ,  G01N2223/401 ,  G01N2223/423 ,  G01T1/17 ,  G01T1/171 ,  G01T1/24 ,  G01T1/247 ,  G01T7/005 ,  G01V5/0041 ,  G06T11/003 ,  G06T11/005 ,  H01L27/14658 ,  H04N5/32 ,  H04N5/3745 ,  H05G1/60

Abstract: 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 comprises 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 comprises 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.

Abstract translation: 提供了一种基于来自光子计数多仓x射线检测器的图像数据的用于图像重建的方法和相应的系统和装置。 该方法包括确定（S1）给定功能形式的参数，该参数以x射线检测器的读出链中的电压表示的比较器设置与基于拟合的能量表达的相应的能量阈值之间的关系 表示测量的脉冲高度谱的第一组数据与表示参考脉冲高度谱的第二组数据之间的过程。 该方法还包括基于图像数据和确定的参数执行（S2）图像重建。 以这种方式，可以实现高效率的高质量图像重建。

公开(公告)号：WO2018030941A1

公开(公告)日：2018-02-15

申请号：PCT/SE2017/050780

申请日：2017-07-14

Applicant: PRISMATIC SENSORS AB

Inventor： DANIELSSON, Mats ,  KARLSSON, Staffan ,  LIU, Xuejin ,  SJÖLIN, Martin ,  BJÖRKLID, Anders ,  HJÄRN, Torbjörn

IPC: G01T1/24 ,  A61B6/03 ,  G01N23/04

Abstract: A photon-counting detector comprises 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.

Abstract translation: 光子计数检测器包括检测器模块的第一子集和检测器模块的至少一个第二子集。 每个探测器模块都有功耗电路。 第一子集中的检测器模块的耗电电路被配置为在其中检测器模块通电的操作模式中消耗第一功率量。 相应地，至少一个第二子集中的检测器模块的耗电电路在操作模式中被配置为消耗比第一功率量低的第二量的功率。