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    ALIGNING SOURCE-GRATING-TO-PHASE-GRATING DISTANCE FOR MULTIPLE ORDER PHASE TUNING IN DIFFERENTIAL PHASE CONTRAST IMAGING
    22.
    发明申请
    ALIGNING SOURCE-GRATING-TO-PHASE-GRATING DISTANCE FOR MULTIPLE ORDER PHASE TUNING IN DIFFERENTIAL PHASE CONTRAST IMAGING 有权
    在不同阶段对比成像中对多个阶段相位调整进行归一化光栅相位刻痕距离

    公开(公告)号：US20150216499A1

    公开(公告)日：2015-08-06

    申请号：US14421008

    申请日：2013-08-20

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Gerhard Martens ,  Heiner Daerr ,  Thomas Detlef Istel ,  Ewald Roessl ,  Udo Van Stevendaal

    IPC: A61B6/00

    CPC classification number: A61B6/587 ,  A61B6/484 ,  A61B6/582 ,  A61B6/588 ,  A61B6/589 ,  G01N23/20025 ,  G01N23/20075 ,  G01N2223/643

    Abstract: The present invention relates handling misalignment in an X-ray imaging system for differential phase contrast imaging. In order to provide a reduction for the pretuning and adjustment requirements for manufacture and maintenance in a differential phase contrast imaging system, an X-ray imaging system (10) for differential phase contrast imaging, is provided that comprises a differential phase contrast setup (12) with an X-ray source (14) and an X-ray detector (16), a grating arrangement (18) comprising a source grating (20), a phase grating (22) and an analyser grating (24), wherein the source grating is arranged between the X-ray source and the phase grating, and the analyser grating is arranged between the phase grating and the detector. Further, a moving arrangement for a relative movement between an object under examination and at least one of the gratings is provided, as well as a processing unit (32), and a translation arrangement (34) for translating the source grating. The phase grating, the analyser grating and the detector are provided as a rigid interferometer unit (36), in which the phase grating and the analyser grating are mounted in parallel to each other. The source grating is misaligned in respect to the interferometer unit such that moiré fringes are detectable in the plane of the detector. The processing unit is configured to detect moiré patterns in signals provided by the detector upon X-ray radiation. The processing unit is further configured to compute a translation signal (38) for translating the source grating for achieving a predetermined moiré pattern. The translation arrangement is configured to adjust the positioning of the source grating at least in the X-ray projection direction (30), based on the value of the translation signal.

    Abstract translation: 本发明涉及用于微分相位成像的X射线成像系统中的处理未对准。 为了降低差分相位成像系统中的制造和维护的预调节和调整要求，提供了用于差分相位成像的X射线成像系统（10），其包括差分相位对比度设置（12 ）与X射线源（14）和X射线检测器（16），包括源光栅（20），相位光栅（22）和分析器光栅（24）的光栅装置（18） 源光栅布置在X射线源和相位光栅之间，分析器光栅布置在相位光栅和检测器之间。 此外，提供了用于在检查对象和至少一个光栅之间的相对运动的移动装置，以及处理单元（32）和用于平移源光栅的平移装置（34）。 相位光栅，分析器光栅和检测器被提供为刚性干涉仪单元（36），其中相位光栅和分析器光栅彼此平行地安装。 源光栅相对于干涉仪单元不对准，使得在检测器的平面中可以检测到莫尔条纹。 处理单元被配置为在X射线辐射时检测由检测器提供的信号中的莫尔图案。 处理单元还被配置为计算用于平移源光栅以实现预定莫尔图案的平移信号（38）。 平移装置被配置为至少基于转换信号的值来调整源光栅的至少在X射线投射方向（30）上的定位。

    Anti-scatter grid assembly for detector arrangement
    23.
    发明授权
    Anti-scatter grid assembly for detector arrangement 有权

    公开(公告)号：US11232881B2

    公开(公告)日：2022-01-25

    申请号：US16463150

    申请日：2017-11-22

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Axel Thran ,  Heiner Daerr ,  Ewald Roessl ,  Gereon Vogtmeier

    IPC: G01T1/16 ,  G21K1/02

    Abstract: The present invention relates to an anti-scatter grid (ASG) assembly comprising a first and a second grid, wherein the second grid is arranged on top of the first grid and comprises a lateral shift. The lamella thickness of the first grid is smaller than the lamella thickness of the second grid. The present invention further relates to a detector arrangement comprising a pixel detector and an ASG assembly arranged on top of the pixel detector.

    X-ray detector for grating-based phase-contrast imaging
    25.
    发明授权
    X-ray detector for grating-based phase-contrast imaging 有权

    公开(公告)号：US11000249B2

    公开(公告)日：2021-05-11

    申请号：US16347992

    申请日：2017-11-09

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Heiner Daerr ,  Thomas Koehler

    IPC: A61B6/00 ,  G01N23/041 ,  G01T1/20 ,  G01N23/20 ,  A61B6/03 ,  G21K1/02

    Abstract: An X-ray detector (10) for a phase contrast imaging system (100) and a phase contrast imaging system (100) with such detector (10) are provided. The X-ray detector (10) comprises a scintillation device (12) and a photodetector (14) with a plurality of photosensitive pixels (15) optically coupled to the scintillation device (12), wherein the X-ray detector (10) comprises a primary axis (16) parallel to a surface normal vector of the scintillation device (12), and wherein the scintillation device (12) comprises a wafer substrate (18) having a plurality of grooves (20), which are spaced apart from each other. Each of the grooves (20) extends to a depth (22) along a first direction (21) from a first side (13) of the scintillation device (12) into the wafer substrate (18), wherein each of the grooves (20) is at least partially filled with a scintillation material. Therein, the first direction (21) of at least a part of the plurality of grooves (20) is different from the primary axis (16), such that at least a part of the plurality grooves (20) is tilted with respect to the primary axis (16). An angle between the first direction (21) of a groove (20) arranged in a center region (24) of the scintillation device (12) and the primary axis (16) is smaller than an angle between the first direction (21) of a groove (20) arranged in an outer region (26) of the scintillation device (12) and the primary axis (16).

    Pulse-width modulation for a photon scanning apparatus
    26.
    发明授权
    Pulse-width modulation for a photon scanning apparatus 有权

    公开(公告)号：US10983071B2

    公开(公告)日：2021-04-20

    申请号：US16305446

    申请日：2018-05-02

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Heiner Daerr ,  Roland Proksa ,  Frank Bergner

    IPC: G01N23/04 ,  A61B6/03 ,  G01T7/00 ,  G01N23/046 ,  A61B6/00

    Abstract: The present invention relates to a photon scanning apparatus comprising a photon source (2) to emit a photon beam (4), a photon detector (6) to detect photons emitted from the photon source (2). The photon source (2) is adapted to emit the photon beam (4) in accordance with a predetermined pulse width modulation scheme at a predetermined flux rate, wherein the pulse width modulation scheme defines pulse widths of the photon beam (4) for respective positions of the photon source (2) and the photon detector around a central axis (R) and an object to be scanned. The photon detector (6) is adapted to start detecting photons with a delay relative to the photon source starting to emit photons and to finish detecting photons prior to the photon source stopping to emit photons. The photon scanning apparatus thus only has to be calibrated for the predetermined flux rate.

    Determining calcium content from spectral CT data
    27.
    发明授权
    Determining calcium content from spectral CT data 有权

    公开(公告)号：US10929974B2

    公开(公告)日：2021-02-23

    申请号：US16301477

    申请日：2017-06-14

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Dirk Schaefer ,  Heiner Daerr ,  Thomas Koehler ,  Ewald Roessl

    IPC: G06K9/00 ,  G06T7/00 ,  G16H30/40 ,  G06T11/00 ,  A61B5/02

    Abstract: Present invention relates to devices and methods for determining a calcium content by analyzing cardiac spectral CT data. CT projection data (9), obtainable by scanning a cardiac region of a subject using a spectral CT scanning unit, is modelled (12) by applying a material decomposition algorithm to the projection data to provide a calcium-specific component. Tomographic reconstructions (13) of the projection data, to provide a first 3D image (8), and of the calcium-specific component, to provide a second 3D image (6), are performed. The first 3D image (8) is segmented (14) to provide an image mask (5) corresponding to a cardiovascular structure of interest, a part of the second 3D image (6) is selected (15) based on the image mask (5), and a calcium content is calculated (16) in the cardiovascular structure of interest based on the selected part of the second 3D image (6).

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