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    METHOD OF COMPUTED TOMOGRAPHY IMAGING
    1.
    发明申请
    METHOD OF COMPUTED TOMOGRAPHY IMAGING 审中-公开

    公开(公告)号：US20180303436A1

    公开(公告)日：2018-10-25

    申请号：US15770773

    申请日：2016-11-01

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Roland PROKSA ,  Heiner DAERR ,  Daniela MUENZEL ,  Peter NOEL

    IPC: A61B6/03 ,  A61B6/00

    Abstract: The invention relates to a method of Computed Tomography imaging comprising: a. Performing a single acquisition of image data from at least two contrast agents into a blood vessel network, a first contrast agent among said at least two contrast agents having been in said blood vessel network for a longer time than a second contrast agent among said at least two contrast agents, b. Processing said image data using K-Edge detection and/or iodine delineation to separate data associated with each contrast agents in order to obtain a concentration map of each contrast agent, c. Determining from said image data a first part of the blood vessel network comprising both the first contrast agent and the second contrast agent, and a second part of the blood vessel network comprising only the first contrast agent, d. Calculating a partial blood volume map of the first part of the blood vessel network based on the total amount of second contrast agent and on the concentration map of the second contrast agent, e. Calculating a partial blood volume map of the second part of the blood vessel network based on the total amount of first contrast agent, on the concentration map of the first contrast agent and on the partial blood volume map of the first part of the blood vessel network.

    PHOTON-COUNTING DETECTOR CALIBRATION
    4.
    发明申请
    PHOTON-COUNTING DETECTOR CALIBRATION 有权
    光电计数检测器校准

    公开(公告)号：US20160113603A1

    公开(公告)日：2016-04-28

    申请号：US14889899

    申请日：2014-05-10

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Carsten Oliver SCHIRRA ,  Axel THRAN ,  Heiner DAERR ,  Ewald ROESSL

    IPC: A61B6/00 ,  G01T1/161 ,  A61B6/03 ,  G01T7/00

    CPC classification number: A61B6/4241 ,  A61B6/032 ,  A61B6/4233 ,  A61B6/482 ,  A61B6/583 ,  A61B6/585 ,  G01T1/161 ,  G01T1/169 ,  G01T7/005

    Abstract: A method includes determining calibration factors for calibrating photon-counting detectors of a spectral imaging system by combining a heuristic calibration of the photon-counting detectors and an analytical calibration of the photon-counting detectors and generating a set of photon-counting calibration factors based on the combining of the a heuristic calibration and the analytical calibration. The photon-counting calibration factors, when applied to measured energy-resolved data from the photon-counting detectors of a spectral CT scan of a subject or object, mitigate spectral distortion caused by a radiation intensity profile shaper that filters a radiation beam of the spectral CT scan.

    Abstract translation: 一种方法包括通过组合光子计数检测器的启发式校准和光子计数检测器的分析校准来确定用于校准光谱成像系统的光子计数检测器的校准因子，并且基于以下方式产生一组光子计数校准因子： 组合启发式校准和分析校准。 光子计数校准因子当应用于来自受试者或物体的光谱CT扫描的光子计数检测器的测量的能量分辨数据时，减轻由辐射强度分布整形器引起的光谱失真，其对光谱的辐射束进行滤波 CT扫描。

    AN X-RAY FLUX REDUCER FOR A PHOTON COUNTING DETECTOR
    6.
    发明申请
    AN X-RAY FLUX REDUCER FOR A PHOTON COUNTING DETECTOR 审中-公开

    公开(公告)号：US20170332984A1

    公开(公告)日：2017-11-23

    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 ,  A61B6/04 ,  A61B6/00

    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.

    X-RAY DETECTOR, IMAGING APPARATUS AND CALIBRATION METHOD
    7.
    发明申请
    X-RAY DETECTOR, IMAGING APPARATUS AND CALIBRATION METHOD 有权

    公开(公告)号：US20170285186A1

    公开(公告)日：2017-10-05

    申请号：US15114444

    申请日：2015-12-09

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Ewald ROESSL ,  Heiner DAERR

    IPC: G01T1/24 ,  H05G1/08

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

    Abstract: The present invention relates to an X-ray detector comprising a directly converting semiconductor layer (60) 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 (2) or light emitted by at least one light source (30, 33). Further, an evaluation unit (67) is provided for calculating evaluation signals per pixel or group of pixels from first electrical measurement signals generated per pixel or group of pixels 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 per pixel or group of pixels when light from said at least one light source at a second intensity is coupled into the semiconductor layer, wherein said evaluation unit is configured to detect per pixel or group of pixels a noise peak in said first and second electrical measurement signals and to determine offset and gain per pixel or group of pixels from the detected noise peaks. A detection unit (69) is provided for determining detection signals from electrical measurement signals generated when x-ray radiation is incident onto the semiconductor layer, and a calibration unit (68) is provided for calibrating the detection unit on the basis of the evaluation signals.

    PHOTON-COUNTING DETECTOR
    8.
    发明申请
    PHOTON-COUNTING DETECTOR 审中-公开
    光电计数器

    公开(公告)号：US20160324494A1

    公开(公告)日：2016-11-10

    申请号：US15104024

    申请日：2014-12-16

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Ewald ROESSL ,  Heiner DAERR ,  Thomas KOEHLER

    IPC: A61B6/00 ,  H05G1/56 ,  H01J35/06 ,  A61B6/03 ,  H01J35/10

    CPC classification number: A61B6/4241 ,  A61B6/032 ,  A61B6/035 ,  A61B6/405 ,  A61B6/482 ,  A61B6/542 ,  G01T1/247 ,  H01J35/06 ,  H01J35/10 ,  H01J2235/086 ,  H05G1/56 ,  H05G1/60

    Abstract: An imaging system (100) includes a radiation source (110) with a focal spot (204) that emits a beam of x-ray photons that traverses an examination region (106). The imaging system further includes a photon counting detector array (122) that detects a sub-set of the x-ray photons that traverse an examination region. The imaging system further includes a controller (116) that generates and transmits a pause signal, in response to a calculated drop in an intensity of the emitted the beam of x-ray photons below a predetermined intensity level, which causes the photon counting detector array to pause detecting the sub-set of the x-ray photons. The imaging system further includes a counter (136) that counts, for each of a plurality of counting periods, the x-ray photons of the sub-set detected by the photon counting detector array in the corresponding counting period.

    Abstract translation: 成像系统（100）包括具有发射穿过检查区域（106）的x射线光子束的焦点（204）的辐射源（110）。 成像系统还包括光子计数检测器阵列（122），其检测穿过检查区域的x射线光子的子集。 成像系统还包括控制器（116），其响应于计算出的低于预定强度水平的x射线光子束的发射强度的下降，产生和发送暂停信号，这导致光子计数检测器阵列 暂停检测x射线光子的子集。 成像系统还包括计数器（136），对于多个计数周期中的每个计数周期，计数在相应的计数周期内由光子计数检测器阵列检测的子集的x射线光子。

    PULSE-WIDTH MODULATION FOR A PHOTON SCANNING APPARATUS
    9.
    发明申请
    PULSE-WIDTH MODULATION FOR A PHOTON SCANNING APPARATUS 审中-公开

    公开(公告)号：US20200319121A1

    公开(公告)日：2020-10-08

    申请号：US16305446

    申请日：2018-05-02

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Heiner DAERR ,  Roland PROKSA ,  Frank BERGNER

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

    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
    10.
    发明申请
    DETERMINING CALCIUM CONTENT FROM SPECTRAL CT DATA 审中-公开

    公开(公告)号：US20190295249A1

    公开(公告)日：2019-09-26

    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: G06T7/00 ,  G16H30/40 ,  G06T11/00

    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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