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    METHOD AND APPARATUS FOR IMPROVING SCATTER ESTIMATION AND CORRECTION IN IMAGING
    3.
    发明公开
    METHOD AND APPARATUS FOR IMPROVING SCATTER ESTIMATION AND CORRECTION IN IMAGING 审中-实审

    公开(公告)号：EP4310864A3

    公开(公告)日：2024-04-03

    申请号：EP23215814.7

    申请日：2019-11-25

    申请人： Accuray, Inc.

    发明人： GAGNON, Daniel ,  BAI, Chuanyong ,  YU, Zhicong ,  JAIN, Amit ,  MAURER, Jr., Calvin R.

    IPC分类号： A61B6/02 ,  A61B6/03 ,  A61B6/00 ,  G06T11/00 ,  A61N5/10 ,  A61B6/04 ,  A61B6/06 ,  A61B6/40 ,  A61B6/42 ,  A61B6/50 ,  A61B8/08

    摘要： A radiotherapy delivery device that comprises a rotatable gantry system positioned at least partially around a patient support, a first source of radiation coupled to the rotatable gantry system that is configured as a source of therapeutic radiation, a second source of radiation coupled to the rotatable gantry system that is configured as a source of imaging radiation having an energy level less than the source of therapeutic radiation, a radiation detector coupled to the rotatable gantry system and positioned to receive radiation from the second source of radiation, and a beamformer configured to adjust a shape of a radiation beam emitted by the second source of radiation such that the shape of the radiation beam is configured for a wide aperture scan of a wide axial region and a narrow aperture scan of a narrow axial region within the wide axial region. The radiotherapy delivery device also comprises a data processing system configured to receive measured projection data in the wide axial region and the narrow axial region, determine the estimated scatter in the wide axial region using a kernel-based technique wherein the estimated scatter in the wide axial region is based on the projection data from the narrow axial region, reconstruct a patient image based on the estimated scatter, and deliver a dose of therapeutic radiation to the patient via the first radiation source based on the patient image during Adaptive Image-Guided Radiation Therapy (IGRT).

    TUNING METHOD FOR COLLIMATOR, CONTROLLER, COLLIMATOR AND CT MACHINE
    4.
    发明公开
    TUNING METHOD FOR COLLIMATOR, CONTROLLER, COLLIMATOR AND CT MACHINE 审中-实审

    公开(公告)号：EP4335376A1

    公开(公告)日：2024-03-13

    申请号：EP23195877.8

    申请日：2023-09-07

    申请人： Siemens Healthineers AG

    发明人： ZHU, Jia Peng ,  ZHANG, Li Dong ,  ZHANG, Jian ,  ZHAO, Ji Feng ,  YU, Feng Hai

    IPC分类号： A61B6/03 ,  A61B6/06

    摘要： The present invention provides a tuning method for a collimator of a CT machine. The tuning method for a collimator of a CT machine, which, in each cycle of X-ray scan operation and stop, comprises: a detection step (S10) of determining whether an X-ray is generated from the anode plate; if an X-ray is detected in the detection step (S10), the controller calculates the Z-direction heating displacement of the slot plate during the current scan (S20), wherein α indicates the current cycle; the controller drives the slot plate to move by the heating displacement in the Z-direction (S22); if no X-ray is detected in the detection step (S10), the controller calculates the total Z-direction heating displacement of the slot plate at the end of the current scan (S30); the controller, on the basis of the stop time of the X-ray, calculates the cooling displacement of the slot plate during the current stop (S32); and the controller drives the slot plate to move (S34).

    X-RAY IRRADIATION APPARATUS, INCLUDING A SPECTRALLY SHAPING X-RAY OPTIC AND A SPECTRAL FILTER APERTURE DEVICE, FOR X-RAY IMAGING
    8.
    发明公开
    X-RAY IRRADIATION APPARATUS, INCLUDING A SPECTRALLY SHAPING X-RAY OPTIC AND A SPECTRAL FILTER APERTURE DEVICE, FOR X-RAY IMAGING 审中-公开

    公开(公告)号：EP4201328A1

    公开(公告)日：2023-06-28

    申请号：EP21216422.2

    申请日：2021-12-21

    申请人： Universität Hamburg ,  Technische Universität Berlin

    发明人： Baumann, Jonas ,  Schlesiger, Christopher Philip ,  Grüner, Florian ,  Staufer, Theresa ,  Schmutzler, Oliver ,  Körnig, Christian

    IPC分类号： A61B6/00 ,  A61B6/06 ,  G01N23/223 ,  G21K1/02 ,  G21K1/06

    摘要： An X-ray irradiation apparatus (100) comprises an X-ray source device (110) for creating X-rays (2) with a polychromatic spectrum and an X-ray optic device (120) with a beam axis (3) that is longitudinal, wherein the X-ray optic device (120) comprises a reflector device (121) that is polycrystalline having a reflector geometry, a reflector mosaicity and a reflector thickness and the reflector device (121) is arranged for receiving a portion of the X-rays (2) within an acceptance angle of the reflector device (121) and for creating an X-ray beam (4) by Bragg reflection, which is directed along the beam axis (3) towards a focal position thereof and has a spectral distribution determined by the polychromatic spectrum of the X-rays (2), the reflector geometry, the reflector mosaicity and the reflector thickness, and wherein the X-ray optic device (120) further comprises a spectral filter aperture device (122) that is arranged downstream from the reflector device (121) for creating a filter gap (123) transmitting a first spectral portion (4A) of the spectral distribution of the X-ray beam (4) and blocking a second spectral portion (4B) and a third spectral portion (4C) of this spectral distribution, wherein the first spectral portion (4A) has higher energies than the second spectral portion (4B) and lower energies than the third spectral portion (4C), wherein the reflector device (121) has an acceptance solid-angle of at least 100 micro-steradian, and wherein the reflector geometry, the reflector mosaicity, the reflector thickness and the acceptance angle of the reflector device (121) are selected such that simultaneously a radiation flux in the first spectral portion (4A) is at least 1% of an incoming flux of the same spectral portion of the X-rays (2) received by the reflector device (121) with a peak reflectivity of at least 1%, the first spectral portion (4A) has a spectral bandwidth of at most 15 %, the second and third spectral portions (4B, 4C) have a flux reduced by at least three orders of magnitude compared with the flux in the first spectral portion (4A), and the X-ray beam (4) has a focal spot size of less than 1.5 mm. Furthermore, an X-ray fluorescence imaging apparatus (200) and a method of using the X-ray irradiation apparatus (100) are described.

    DETECTION AND COLLIMATION UNIT, DETECTION APPARATUS, AND SPECT IMAGING SYSTEM
    9.
    发明公开
    DETECTION AND COLLIMATION UNIT, DETECTION APPARATUS, AND SPECT IMAGING SYSTEM 审中-公开

    公开(公告)号：EP4194901A1

    公开(公告)日：2023-06-14

    申请号：EP21857568.6

    申请日：2021-08-12

    申请人： Tsinghua University

    发明人： MA, Tianyu ,  LIU, Yaqiang ,  WANG, Xuewu ,  WANG, Zhong

    IPC分类号： G01T1/164 ,  G01T1/202 ,  A61B6/06 ,  G21K1/02

    摘要： The present disclosure provides a detection collimation unit, a detection apparatus and a SPECT imaging system. The detection collimation unit includes: a scintillation crystal array configured to receive a gamma photon emitted by a radioactive source in a detected object; and a number of photoelectric devices configured to receive the gamma photon and converting the gamma photon into a digital signal. The scintillation crystal array includes a number of scintillation crystals. The number of scintillation crystals are arranged substantially in parallel and are spaced from each other. Each scintillation crystal has a side face configured to receive a ray emitted by the radioactive source and an end face. The number of photoelectric devices are coupled to the end faces of the number of scintillation crystals. The detection collimation unit of the present disclosure may be used to replace a heavy metal collimator required for a SPECT imaging. This may reduce a loss of the gamma photon, avoid an absorption of the gamma photon by a circuit board and a photoelectric device in the detection collimation unit, and significantly improve a spatial resolution and a detection efficiency of the SPECT imaging. At the same time, a difficulty in a processing a plurality of small parallel holes or pinholes in the heavy metal collimator may be avoided, and the processing may be simplified.