公开(公告)号：US10679762B2

公开(公告)日：2020-06-09

申请号：US16307675

申请日：2017-06-08

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Roger Steadman Booker ,  Matthias Simon ,  Walter Ruetten ,  Herfried Karl Wieczorek

IPC: G21K1/02 ,  G01N23/041 ,  A61B6/00

Abstract: The invention relates to an analyzing grid for phase contrast imaging and/or dark-field imaging, a detector arrangement for phase contrast imaging and/or dark-field imaging comprising such analyzing grid, an X-ray imaging system comprising such detector arrangement, a method for manufacturing such analyzing grid, a computer program element for controlling such analyzing grid or detector arrangement for performing such method and a computer readable medium having stored such computer program element. The analyzing grid comprises a number of X-ray converting gratings. The X-ray converting gratings are configured to convert incident X-ray radiation into light or charge. The number of X-ray converting gratings comprises at least a first X-ray converting grating and a second X-ray converting grating. Further, the X-ray converting gratings each comprise an array of grating bars, wherein the grating bars within each X-ray converting grating are arranged mutually displaced from each other in a direction perpendicular to the incident X-ray radiation by a specific displacement pitch. Further, the grating bars of the first X-ray converting grating are arranged mutually displaced from the grating bars of the second X-ray converting grating in the direction perpendicular to the incident X-ray radiation by the displacement pitch divided by the number of X-ray converting gratings.

公开(公告)号：US10568593B2

公开(公告)日：2020-02-25

申请号：US15309483

申请日：2015-05-13

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Roland Proksa

IPC: A61B6/00 ,  A61B6/03 ,  A61B6/06

Abstract: An imaging system (1400) includes a first and a second focal spot (1410I and 1410N), a first pre-patient radiation beam filter (1416) disposed between the first focal spot and the examination region and having a first profile and a second pre-patient radiation beam filter (1416N) disposed between the second focal spot and the examination region and having a second profile, and a source controller (1412) that controls an operation of the focal spots by modulating the operation during a scan based on at least one of an angular position of focal spots, a shape of a region of interest of subject or object being scanned, or based on a change in size between two adjacent regions of the subject or object being scanned.

公开(公告)号：US10458926B2

公开(公告)日：2019-10-29

申请号：US15311886

申请日：2015-05-18

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Udo Van Stevendaal ,  Heiner Daerr ,  Thomas Koehler ,  Gerhard Martens ,  Ewald Roessl

IPC: G01N23/00 ,  G01N23/04 ,  A61B6/00 ,  G01N23/041

Abstract: A phantom body (PB) for use in a differential phase contrast imaging apparatus (IM) for calibration of same. The phantom body (PB) allows for simultaneous calibration of three different image signal channels, namely refraction, phase shift and small angle scattering.

公开(公告)号：US10420521B2

公开(公告)日：2019-09-24

申请号：US15328086

申请日：2015-07-20

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Ewald Roessl ,  Thomas Koehler ,  Hans-Aloys Wischmann

IPC: A61B6/00 ,  G21K1/06 ,  G21K1/10 ,  A61B6/06 ,  G21K1/02 ,  A61B6/03 ,  G01N23/20

Abstract: The grating device (1) for an X-ray imaging device comprises a grating arrangement (10) and an actuation arrangement (20). The grating arrangement (10) comprises a plurality of grating segments (11). The actuation arrangement (20) is configured to move the plurality of grating segments (11) with at least a rotational component between a first position and a second position. In the first position, the grating segments (11) are arranged in the path of an X-ray beam (30), so that the grating segments (11) influence portions of the X-ray beam (30). In the second position, the grating segments (11) are arranged outside the portions of the path of an X-ray beam (30), so that the portions of the X-ray beam (30) are unaffected by the grating segments (11).

公开(公告)号：US10368815B2

公开(公告)日：2019-08-06

申请号：US15325551

申请日：2015-07-07

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Ewald Roessl

IPC: A61B6/00 ,  A61B6/06 ,  G01N23/083 ,  A61B6/04

Abstract: The invention relates to X-ray imaging. In order to improve flexibility, for example in relation with phase-contrast imaging, the X-ray imaging device (10) comprises an X-ray source arrangement for providing an X-ray beam (11). Further, it is provided at least one grating (13, 14) and a line detector (15) with a plurality of sensor lines, which sensor lines are each provided by a plurality of sensor elements, and which sensor lines are provided for detecting respective portions of the X-ray beam (11) passing the at least one grating during operation. The X-ray imaging device is arranged for moving the line detector (15) and an object (21) to be imaged relative to each other, such that in response to the portions of the X-ray beam a number of interference patterns are detectable at respective different relative positions of the line detector and the object for reconstructing an image of the object (21). The at least one grating (13, 14) comprises at least one first segment (161) and at least one second segment (162) arranged adjacent to each other in a direction perpendicular to the direction of the line detector (15). The X-ray imaging device is arranged for moving the line detector (15) and the at least one grating relative to each other between at least a first relative position and a second relative position, such that in the first relative position, a portion of the X-ray beam (11) during operation passes through the at least one first segment (161), while the at least one second segment (162) is arranged outside said portion of the X-ray beam (11), and that in the second relative position, said portion of the X-ray beam (11) during operation passes through the at least one second segment (162), while the at least one first segment (161) is arranged outside said portion of the X-ray beam (11).

公开(公告)号：US10172580B2

公开(公告)日：2019-01-08

申请号：US15104816

申请日：2014-12-03

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Ewald Roessl ,  Hendrik Albert Pastink ,  Thomas Koehler ,  Heiner Daerr ,  Udo Van Stevendaal ,  Gerhard Martens

IPC: G21K1/06 ,  A61B6/00 ,  G21K1/04 ,  A61B6/03 ,  A61B6/06

Abstract: A phase contrast imaging apparatus (MA) and related image processing method. The imaging apparatus includes a movable arm (AR) that carries a detector (D) and one or more interferometric gratings (G0,G1,G2). The imaging apparatus includes a rigidizer (RGD) to control the rigidity of at least the arm (AR) or a mounting (GM) for the gratings (G0,G1,G2). This allows controlling a drift of a Moiré pattern as detected in a sequence of readouts. A phase of the so controlled Moiré pattern can be used to calibrate the imaging apparatus by using the image processing method.

公开(公告)号：US10037600B2

公开(公告)日：2018-07-31

申请号：US15309223

申请日：2015-04-21

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Roland Proksa

IPC: G06K9/00 ,  G06T7/00 ,  G06K9/46

CPC classification number: G06T7/0012 ,  A61B6/484 ,  G06K9/4671 ,  G06T11/005 ,  G06T2207/10116 ,  G06T2211/408

Abstract: Methods and related apparatus (SP) to correct phase shift image data for phase wrapping artifacts. The data is detected at a detector (D) of an imaging system (IM) including interferometric equipment (G0, G1, G2). In a phase unwrapping method that involves optimizing an objective function with regularization, a two-sage approach is proposed. The measured data is processed in one stage with regularization and in the other stage without regularization. This allows improving the accuracy of the corrected (phase unwrapped) phase shift data because an undesirable bias caused by the regularization can be avoided.

公开(公告)号：US09959640B2

公开(公告)日：2018-05-01

申请号：US15308378

申请日：2015-09-15

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Roland Proksa ,  Michael Grass

IPC: G06K9/00 ,  G06T11/00 ,  G06T7/00 ,  G06T11/60 ,  G06K9/62 ,  G06T5/50 ,  A61B6/00 ,  A61B6/03

CPC classification number: G06T11/008 ,  A61B6/032 ,  A61B6/5235 ,  A61B6/5282 ,  G06K9/6215 ,  G06T5/50 ,  G06T7/0012 ,  G06T11/006 ,  G06T11/60 ,  G06T2207/10081 ,  G06T2207/30004 ,  G06T2211/408 ,  G06T2211/424

Abstract: A method includes performing a first pass of an iterative image reconstruction in which an intermediate first spectral image and an intermediate second spectral image are generated using an iterative image reconstruction algorithm, start first spectral and second spectral images, and initial first spectral regularization and second spectral regularization parameters, updating at least one of the initial first spectral regularization or second spectral regularization parameters, thereby creating an updated first spectral regularization or second spectral regularization parameter, based at least on a sharpness of one of the intermediate first spectral or second spectral images, and performing a subsequent pass of the iterative image reconstruction in which an updated intermediate first spectral and second spectral image is generated using the iterative image reconstruction algorithm, the intermediate first spectral and second spectral images, and the updated first spectral regularization and Compton scatter regularization parameters.

公开(公告)号：US09901314B2

公开(公告)日：2018-02-27

申请号：US14910068

申请日：2014-08-05

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Roland Proksa

IPC: G21K3/00 ,  A61B6/00 ,  A61B6/03

CPC classification number: A61B6/4035 ,  A61B6/032

Abstract: A filter assembly for use in a helical computed tomography system having an x-ray source for projecting x-ray beams along a projection axis is presented, the filter assembly including a first filter element for attenuating at least a portion of the x-ray beams, the first filter element constructed as a background-wedge for attenuating x-rays having a large aperture and a second filter element for attenuating at least a portion of the x-ray beams, the second filter element constructed to create a ridge. The second filter element may be rotated with respect to or adjusted in relation with or removed or replaced from the filter assembly to allow for adaptation to different helical pitch values.

公开(公告)号：US09895117B2

公开(公告)日：2018-02-20

申请号：US15310933

申请日：2015-10-01

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Michael Grass ,  Dirk Schafer ,  Thomas Koehler

IPC: G03H5/00 ,  A61B6/00

CPC classification number: A61B6/4291 ,  A61B6/484 ,  A61B6/503 ,  A61B6/504 ,  A61B6/527

Abstract: The invention relates to a grating device for phase contrast and/or dark-field imaging of a movable object, an interferometer unit, a phase contrast and/or dark-field imaging system, a phase contrast and/or dark-field imaging method, a computer program element for controlling such device and a computer readable medium having stored such computer program element. The grating device comprises a grating unit, an actuation unit, a motion detecting unit, and a control unit. The actuation unit is configured to position the grating unit in different sampling positions relative to the moveable object. The motion detecting unit is configured to detect a motion of the movable object. The detected motion of the moveable object may be a repetitive motion. The control unit is configured to control the actuation unit to position the grating unit in the different sampling positions based on the detected motion of the movable object.