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    X-ray detector, imaging apparatus and calibration method
    3.
    发明授权
    X-ray detector, imaging apparatus and calibration method 有权

    公开(公告)号：US10001567B2

    公开(公告)日：2018-06-19

    申请号：US15114444

    申请日：2015-12-09

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Ewald Roessl ,  Heiner Daerr

    IPC: G01T1/24 ,  A61B6/00 ,  H05G1/08 ,  G01T7/00 ,  H01J35/02

    CPC classification number: G01T1/24 ,  A61B6/585 ,  G01T7/005 ,  H01J35/02 ,  H05G1/08

    Abstract: An X-ray detector comprises a directly converting semiconductor layer having a plurality of pixels for converting incident radiation into electrical measurement signals with a band gap energy characteristic of the semiconductor layer, wherein said incident radiation is x-ray radiation emitted by an x-ray source or light omitted by at least one light source. An evaluation unit calculates evaluation signals per pixel or group of pixels from first electrical measurement signals generated when light from said at least one light source at a first intensity is coupled into the semiconductor layer, and second electrical measurement signals generated when light from said at least one light source at a second intensity is coupled into the semiconductor layer. A detection unit determines detection signals from electrical measurement signals generated when x-ray radiation is incident onto the semiconductor layer, and a calibration unit calibrates the detection unit on the basis of the evaluation signals.

    CONVENTIONAL IMAGING WITH AN IMAGING SYSTEM HAVING PHOTON COUNTING DETECTORS
    4.
    发明申请
    CONVENTIONAL IMAGING WITH AN IMAGING SYSTEM HAVING PHOTON COUNTING DETECTORS 审中-公开
    具有光电计数检测器的成像系统的常规成像

    公开(公告)号：US20150063527A1

    公开(公告)日：2015-03-05

    申请号：US14387550

    申请日：2013-03-25

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Heiner Daerr ,  Ewald Roessl

    IPC: G01T1/18 ,  G01N23/04 ,  G01T1/24

    CPC classification number: G01T1/18 ,  A61B6/032 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/585 ,  G01N23/046 ,  G01T1/171 ,  G01T1/248

    Abstract: An imaging system (600) includes a radiation source (608) that emits polychromatic radiation that traverses an examination region and a detector array (610) located opposite the radiation source, across the examination region, which includes a paralyzable photon counting detector pixel (611) that detects photons of the radiation that traverse the examination region and illuminate the detector pixel and that generates a signal indicative of each detected photon. An output photon count rate to input photon count rate map (626) includes at least one map which maps multiple input photon count rates of the detector pixel to a single output photon count rate of the detector pixel, and an input photon count rate determiner (624) identifies one input photon count rate of the multiple input photon count rates of the map as a correct input photon count rate for the detector pixel. A reconstructor that reconstructs the signal based on the identified input photon count rate.

    Abstract translation: 成像系统（600）包括：放射源（608），其辐射穿过检查区域的多色辐射;以及跨越检查区域的与辐射源相对的检测器阵列（610），该检测器阵列包括可分离的光子计数检测器像素（611 ），其检测穿过检查区域的辐射的光子并照亮检测器像素，并且产生指示每个检测到的光子的信号。 输入光子计数速率到输入光子计数率图（626）包括至少一个映射，其将检测器像素的多个输入光子计数率映射到检测器像素的单个输出光子计数率，以及输入光子计数率确定器 624）将映射的多输入光子计数率的一个输入光子计数率识别为检测器像素的正确输入光子计数率。 一种基于所识别的输入光子计数率来重建信号的重建器。

    Apparatus, system, method and computer program for reconstructing a spectral image of a region of interest of an object
    5.
    发明授权
    Apparatus, system, method and computer program for reconstructing a spectral image of a region of interest of an object 有权

    公开(公告)号：US11340363B2

    公开(公告)日：2022-05-24

    申请号：US16962857

    申请日：2019-01-17

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Heiner Daerr ,  Bernhard Johannes Brendel ,  Axel Thran ,  Artur Sossin

    IPC: G01T1/29

    Abstract: The invention relates to an image reconstruction apparatus comprising a detector value providing unit for providing detector values for each detector element of a plurality of detector elements forming a radiation detector and for each energy bin of a plurality of predefined energy bins, a correlation value providing unit for providing correlation values, wherein a correlation value is indicative of a correlation of a detector value detected by a detector element in an energy bin with at least one of a) a detector value detected by another detector element in the energy bin, b) a detector value detected by another detector element in another energy bin, and c) a detector value detected by the detector element in another energy bin, and a spectral image reconstruction unit for reconstructing a spectral image based on the detector values and the correlation values.

    X-ray flux reducer for a photon counting detector
    6.
    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
    8.
    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
    9.
    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.

    Correcting photon counts in a photon counting X-ray radiation detection system
    10.
    发明授权
    Correcting photon counts in a photon counting X-ray radiation detection system 有权

    公开(公告)号：US10281596B2

    公开(公告)日：2019-05-07

    申请号：US15756611

    申请日：2016-09-09

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Heiner Daerr ,  Axel Thran

    IPC: G01T1/24 ,  A61B6/03 ,  A61B6/00 ,  G01T1/29

    Abstract: The invention relates to a photon counting x-ray radiation detection system. The system (31) comprises an x-ray radiation device (2) for providing polychromatic x-ray radiation (4) for traversing an examination zone (5) during a detection period of a scan. A photon counting detection device (6) comprising detection elements (3) detects the x-ray radiation after having traversed the examination zone and measures for each detection element photon counts in one or more energy bins during the detection period. A correction unit (12) estimates for each detection element an amount of a build up charge present in the detection element and corrects the measured photon counts for the detection element based on the estimated amount of the build up charge. This allows the corruption of the photon count rates caused by the build up charges to be compensated and to improve the determination of the photon counts.

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