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    Image noise estimation using alternating negation
    33.
    发明授权
    Image noise estimation using alternating negation 有权

    公开(公告)号：US10984564B2

    公开(公告)日：2021-04-20

    申请号：US16463859

    申请日：2017-12-06

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Frank Bergner ,  Bernhard Johannes Brendel ,  Thomas Koehler ,  Kevin Martin Brown

    IPC: G06K9/00 ,  G06T11/00 ,  G01N23/046

    Abstract: An imaging system (400) includes a radiation source (408) configured to emit X-ray radiation, a detector array (410) configured to detected X-ray radiation and generate projection data indicative thereof, and a first processing chain (418) configured to reconstruct the projection data and generate a noise only image. A method includes receiving projection data produced by an imaging system and processing the projection data with a first processing chain configured to reconstruct the projection data and generate a noise only image. A processor is configured to: scan an object or subject with an x-ray imaging system and generating projection data, process the projection data with a first processing chain configured to reconstruct the projection data and generate a noise only image, process the projection data with a second processing chain configured to reconstruct the projection data and generate a structure image, and de-noise the structure image based on the noise only image.

    X-ray flux reducer for a photon counting detector
    35.
    发明授权
    X-ray flux reducer for a photon counting detector 有权

    公开(公告)号：US10959688B2

    公开(公告)日：2021-03-30

    申请号：US15525079

    申请日：2015-11-11

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Bernhard Johannes Brendel ,  Roland Proksa ,  Thomas Koehler ,  Ewald Roessl ,  Heiner Daerr ,  Michael Grass ,  Axel Thran

    IPC: A61B6/06 ,  A61B6/03 ,  A61B6/00 ,  A61B6/04

    Abstract: An imaging system includes a radiation source (108) configured to rotate about an examination region (106) and emit radiation that traverses the examination region. The imaging system further includes an array of radiation sensitive pixels (112) configured to detect radiation traversing the examination region and output a signal indicative of the detected radiation. The array of radiation sensitive pixels is disposed opposite the radiation source, across the examination region. The imaging system further includes a rigid flux filter device (130) disposed in the examination region between the radiation source and the radiation sensitive detector array of photon counting pixels. The rigid flux filter device is configured to filter the radiation traversing the examination region and incident thereon. The radiation leaving the rigid flux filter device has a predetermined flux.

    Phantom device, dark field imaging system and method for acquiring a dark field image
    36.
    发明授权
    Phantom device, dark field imaging system and method for acquiring a dark field image 有权

    公开(公告)号：US10507004B2

    公开(公告)日：2019-12-17

    申请号：US16321504

    申请日：2017-12-18

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Heiner Daerr ,  Thomas Koehler ,  Hanns-Ingo Maack

    IPC: A61B6/00 ,  G01N23/041

    Abstract: The present invention relates to phantom device for a dark field imaging system. Although dark field imaging is known to be sensitive to changes in the micro-structure of the tissue of a human subject that may be caused during a disease progression, there may be a need to quantify information provided by an image of the human subject. A detector signal component representing the dark image may be altered by changes of the X-ray spectrum which passes tissue of the human subject comprising micro-structures. This may be caused due to an attenuation of the X-ray radiation previously provided by an X-ray source, wherein the attenuation may be caused by tissue of the human subject, which covers said micro-structure comprising tissue. In order to provide information in clinical practice regarding the influence of attenuation to the X-ray radiation before it passes the micro-structure issue of the human subject, the phantom device for dark field imaging is proposed. The phantom device comprises a main body, wherein the main body comprises a plurality of reference parts. Each of the reference parts comprises an attenuation part and a de-coherence part. The attenuation part and the de-coherence part of the same reference part are stacked on top of each other. As a result, the different reference parts may imitate different portions of the human subject extending along a propagation direction of an X-ray radiation, which is propagated from an X-ray source of the dark field imaging system towards the corresponding X-ray detector. Thus, if the phantom device is scanned simultaneously or subsequently with the human subject, a dark field image may be acquired, which represents the human subject as well as the phantom device. From the image parts of the dark field image caused by the phantom device, a clinician may assess and classify the corresponding parts of the image, which relates to the human subject, for instance to the portions of the lung. The present invention further relates to an imaging system configured to scan a human subject together with the phantom device as well as a corresponding method.

    Beam hardening correction for scanning dark field and phase contrast imaging
    37.
    发明授权
    Beam hardening correction for scanning dark field and phase contrast imaging 有权

    公开(公告)号：US10417761B2

    公开(公告)日：2019-09-17

    申请号：US15571893

    申请日：2016-05-06

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Thomas Koehler ,  Heiner Daerr ,  Ewald Roessl

    IPC: G06K9/00 ,  A61B6/00 ,  G06T7/00 ,  G06T11/00

    Abstract: An apparatus and related method for processing image data supplied by a scanning phase contrast or dark-field imaging apparatus (MA). Beam hardening artifact in phase contrast and dark-field imaging can be reduced by applying a beam hardening processing operation by a beam hardening processing module (BHC) in respect of a plurality of detector readings that contribute signals to the same image pixel position or geometric ray of an imaging region of the apparatus (MA). In one embodiment, a phantom body (PB) is used to acquire calibration data on which the beam hardening processing is based.

    Method and X-ray system for computer aided detection of structures in X-ray images
    38.
    发明授权
    Method and X-ray system for computer aided detection of structures in X-ray images 有权

    公开(公告)号：US10296808B2

    公开(公告)日：2019-05-21

    申请号：US14772794

    申请日：2014-02-20

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Jon Erik Fredenberg ,  Mats Vilhelm Lundqvist ,  Ewald Roessl ,  Klaus Erhard ,  Thomas Koehler ,  Bjorn Cederstrom ,  Hanns-Ingo Maack

    IPC: G06K9/46 ,  A61B6/00 ,  G06T5/50 ,  G06K9/52 ,  G06K9/62 ,  G06T7/00 ,  G06T7/60

    Abstract: The present invention relates to X-ray imaging technology as well as image post-processing. Particularly, the present invention relates to a method for computer aided detection of structures in X-ray images as well as an X-ray system. A computer aided detection algorithm visibly determines tissue structures in X-ray image information and subsequently matches the shape of a determined tissue structure with a library of known tissue structures for characterizing the type of determined tissue structure. The determination of a tissue structure and thus the characterization of the type of the tissue structure may be enhanced when employing also spectral information, in particular energy information of the acquired X-ray image. Accordingly, a method (70,80,90) for computer aided detection of structures and X-ray images is provided, comprising the steps of obtaining (72) spectral X-ray image information of an object, wherein the spectral X-ray image information constitutes at least one X-ray image, detecting (74) a tissue structure of interest in the X-ray image by employing a computer aided detection algorithm, wherein detecting a tissue structure of interest in the X-ray image comprises the computer aided detection algorithm being adapted to evaluate the X-ray image for tissue structure shape and compare the tissue structure shape with a plurality of pre-determined tissue structure shapes and wherein the computer aided detection algorithm is adapted to evaluate spectral information of the X-ray image for detecting the tissue structure of interest.

    Contrast agent dose simulation
    39.
    发明授权
    Contrast agent dose simulation 有权

    公开(公告)号：US10213167B2

    公开(公告)日：2019-02-26

    申请号：US15316540

    申请日：2015-05-26

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Rolf Dieter Bippus ,  Thomas Koehler ,  Michael Grass

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

    Abstract: A method includes obtaining a set of energy dependent data generated from a spectral scan. The set of energy dependent data includes a sub-set of data corresponding to only contrast agent. The method further includes separating the sub-set of data from other data of the energy dependent data. The other data includes non-contrast agent data. The method further includes scaling the sub-set of data to change a concentration of the contrast agent in the sub-set of data from that of the sub-set of data. The method further includes visually presenting at least the scaled sub-set of data.

    X-ray detector device for inclined angle X-ray radiation
    40.
    发明授权
    X-ray detector device for inclined angle X-ray radiation 有权

    公开(公告)号：US10172577B2

    公开(公告)日：2019-01-08

    申请号：US15504072

    申请日：2015-12-01

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Ewald Roessl ,  Thomas Koehler

    IPC: G01T1/24 ,  A61B6/00 ,  H01L31/0224 ,  H01L31/08 ,  H01L31/115

    Abstract: The invention relates to an X-ray detector device (10) for detection of X-ray radiation at an inclined angle relative to the X-ray radiation, an X-ray imaging system (1), an X-ray imaging method, and a computer program element for controlling such an X-ray imaging system for performing such method and a computer readable medium having stored such computer program element. The X-ray detector device (10) comprises a cathode surface (11) and an anode surface (12). The cathode surface (11) and the anode surface (12) are displaced by a separation layer (13) allowing charge transport (T) between the cathode surface (11) and the anode surface (12) in response to X-ray radiation incident during operation on the cathode surface (11). The anode surface (12) is segmented into anode pixels (121) and the cathode surface (11) is segmented into cathode pixels (111). At least one of the cathode pixels (111) is assigned to at least one of the anode pixels (121) in a coupling direction (C) inclined relative to the cathode surface (11). At least one of the cathode pixels (111) is configured to be at a voltage offset ΔU relative to an adjacent cathode pixel and at least one of the anode pixels (121) is configured to be at a voltage offset ΔU relative to an adjacent anode pixel (121). The voltage offset ΔU is configured to converge the charge transport (T) in a direction parallel to the coupling direction (C).

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