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公开(公告)号：US11020070B2
公开(公告)日：2021-06-01
申请号：US15317143
申请日：2015-06-25
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Ewald Roessl
Abstract: A method of processing a signal measured by an energy-resolving detector after passage of radiation through a sample includes receiving a measured count rate for photonic interactions with the detector, fitting a signal model to the detected counts, wherein the signal model is configured to account for a pulse-pile-up effect, the signal model representing a conditional expectation of a frequency of at least uni-directional pulse crossing of at least one energy level, given a physical quantity of a material in the sample, wherein the signal model is expressed in terms of a Fourier representation of a pulse height variable.
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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
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.
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公开(公告)号：US10470721B2
公开(公告)日：2019-11-12
申请号：US15528992
申请日：2015-11-17
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Ewald Roessl
Abstract: The invention relates to an X-ray detector arrangement (10) for X-ray phase contrast tomo-synthesis imaging, a line detector (1) for X-ray phase contrast tomo-synthesis imaging, an imaging system (24) for X-ray phase contrast tomo-synthesis imaging, a method for X-ray phase contrast tomo-synthesis imaging, and a computer program element for controlling such arrangement and a computer readable medium having stored such computer program element. The X-ray detector arrangement (10) comprises several line detectors (1). Each line detector (1) is configured to detect a Moiré pattern in at least a portion of an X-ray beam (2) impacting such line detector (1). Each line detector (1) comprises several detector lines (11), wherein a width W of each line detector (1) equals one period or an integer multiple of the period of the Moiré pattern.
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公开(公告)号：US10460899B2
公开(公告)日：2019-10-29
申请号：US15516936
申请日：2015-09-30
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Rolf Karl Otto Behling , Ewald Roessl
Abstract: The invention relates to a modification arrangement for an X-ray generating device, a modification method, a computer program element for controlling such device and a computer readable medium having stored such computer program element. The modification arrangement comprises a cathode, an anode (2) and modification means, e.g. a modification device. The cathode is configured to provide an electron beam (15). The anode (2) is configured to rotate under impact of the electron beam (15) and is segmented by slits (21) arranged around the anode's circumference. The modification means are configured to modify the electron beam (15) when the electron beam (15) is hitting one of the anode's rotating slits (21).
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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
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.
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Patent Agency Ranking
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
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.
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公开(公告)号：US10231684B2
公开(公告)日：2019-03-19
申请号：US14396066
申请日：2013-04-22
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Ming De Lin , Ewald Roessl , Carsten Oliver Schirra
Abstract: An imaging system (100) includes a radiation source (108) that emits radiation that traverses an examination region and imageable drug eluting beads in tissue of interest located therein, a spectral detector array (110) detects radiation traversing the examination region and generates a signal indicative thereof, spectral processing circuitry (117) that spectrally resolves the signal based on a plurality of thresholds (122), and a reconstructor (128) that generates spectral volumetric image data corresponding the imageable drug eluting beads based on the spectrally resolved signal.
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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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19.发明授权公开(公告)号：US10045749B2
公开(公告)日：2018-08-14
申请号：US15028041
申请日：2014-10-13
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Michael Grass , Klaus Erhard , Ewald Roessl
Abstract: An X-ray system (2) for acquiring an image of an object has an X-ray detector (8), which is segmented into a plurality of neighboring detector tiles. In particular, the image can be a two-dimensional projection image but also a three-dimensional volume of the object reconstructed from a tomosynthesis acquisition. An X-ray detector moving mechanism (18) is adapted for moving the X-ray detector (8) at least between a first X-ray detector position and a second X-ray detector position during operation of the X-ray system. An X-ray source (4), a collimator (22) and the X-ray detector (8) of the X-ray system (2) are adapted for acquiring a plurality of partial X-ray images through the adjacent detector tiles while irradiating the object with X-ray beams from a plurality of tomographic angles α. The processing unit is adapted for generating a two-dimension image of the object and/or for reconstructing a three-dimensional volume of the object from the acquired partial images.
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公开(公告)号：US09839407B2
公开(公告)日：2017-12-12
申请号：US14896783
申请日：2014-06-27
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Ewald Roessl , Gerhard Martens
CPC classification number: A61B6/582 , A61B6/484 , A61B6/5258 , A61B6/583 , G01N23/20075 , G01N2223/303 , G02B5/1838 , G21K1/06 , G21K1/10 , G21K2207/005
Abstract: The present invention relates to calibration in X-ray phase contrast imaging. In order to remove the disturbance due to individual gain factors, a calibration filter grating (10) for a slit-scanning X-ray phase contrast imaging arrangement is provided that comprises a first plurality of filter segments (11) comprising a filter material (12) and a second plurality of opening segments (13). The filter segments and the opening segments are arranged alternating as a filter pattern (15). The filter material is made from a material with structural elements (14) comprising structural parameters in the micrometer region. The filter grating is movably arranged between an X-ray source grating (54) and an analyzer grating (60) of an interferometer unit in a slit-scanning system of a phase contrast imaging arrangement. The slit-scanning system is provided with a pre-collimator (55) comprising a plurality of bars (57) and slits (59). The filter pattern is aligned with the pre-collimator pattern (61).
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