公开(公告)号：US10314556B2

公开(公告)日：2019-06-11

申请号：US15312693

申请日：2016-04-25

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Ewald Roessl ,  Gerhard Martens ,  Heiner Daerr

IPC: A61B6/03 ,  A61B6/00 ,  G01N23/04 ,  G01N23/041

Abstract: Apparatus and related method for dark-field imaging. The apparatus operates on projective intensities detected at a detector in different energy channels. An energy weighting is used to improve the signal to noise ratio. The model operates in a logarithmic domain.

公开(公告)号：US10945690B2

公开(公告)日：2021-03-16

申请号：US15738324

申请日：2016-06-24

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Gerhard Martens ,  Roland Proksa ,  Hanns-Ingo Maack ,  Udo Van Stevendaal ,  Franz Josef Pfeiffer ,  Peter Benjamin Theodor Noel ,  Maximilian Von Teuffenbach

IPC: G03H5/00 ,  A61B6/00

Abstract: An X-ray imaging apparatus with an interferometer (IF) and an X-ray detector (D). A footprint of the X-ray detector (D) is larger than a footprint of the interferometer (IF). The interferometer is moved in scan motion across the detector (D) whilst the detector (D) remains stationary. Preferably the detector is a 2D full field detector.

公开(公告)号：US10765383B2

公开(公告)日：2020-09-08

申请号：US15743304

申请日：2016-07-12

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Gerhard Martens ,  Ewald Roessl

IPC: G21K1/06 ,  A61B6/06 ,  A61B6/00 ,  G01N23/044 ,  G01N23/20008 ,  G02B5/10 ,  G02B27/09 ,  G21K1/02

Abstract: The invention relates to an X-ray imaging apparatus (2), comprising: a source (4) for generating X-ray radiation, an object receiving space (6) for arranging an object of interest for X-ray imaging, an X-ray collimator arrangement (8) arranged between the source (4) and the collimator arrangement (8), and an X-ray mirror arrangement (10). The mirror arrangement (10) comprises for example two tapered mirrors (22) facing each other and adapted for guiding X-ray radiation of the source (4) to the collimator arrangement (8). Consequently, the X-ray intensity at the object receiving space (6) is increased. In order to limit the X-ray radiation to an area, where the X-ray radiation can be utilized form imaging, an angle of spread Θm between the mirrors (22) and a length LM of each mirror (22) is adapted, such that a number of total reflections of X-ray radiation, provided by the source (4), at the mirrors (22) is limited. The limitation provides the effect that an angle of reflection Θr of the totally reflected X-ray radiation is limited. Consequently, an X-ray intensity at the object receiving space (6) is increased while constrains are provided, which prevent a large increase of a width of the X-ray radiation provided at the object receiving space (6), which effectively improves an imaging quality of an object of interest being arrangeable at the object receiving space (6).

公开(公告)号：US09717470B2

公开(公告)日：2017-08-01

申请号：US14421008

申请日：2013-08-20

Applicant: KONINKLIJKE PHILIPS N.V.

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

IPC: G01N23/04 ,  A61B6/00 ,  G01N23/20

CPC classification number: A61B6/587 ,  A61B6/484 ,  A61B6/582 ,  A61B6/588 ,  A61B6/589 ,  G01N23/20025 ,  G01N23/20075 ,  G01N2223/643

Abstract: An X-ray imaging method includes acquiring a differential phase contrast imaging X-ray scan with an X-ray imaging system having an X-ray source, an X-ray detector, and a grating arrangement having a source grating, a phase grating and an analyzer grating. The source grating is misaligned in respect to an interferometer such that moiré fringes are detectable in the plane of the detector. A translation signal is computed for translating the source grating for achieving a predetermined moiré pattern. The positioning of the source grating is adjusted in an X-ray projection direction based on the translation signal such that at least 2 pi of phase changes are covered with the Moiré fringes over the width of the detector. And a further differential phase contrast imaging X-ray scan is acquired.

公开(公告)号：US10506993B2

公开(公告)日：2019-12-17

申请号：US15511362

申请日：2016-08-26

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Gerhard Martens ,  Udo Van Stevendaal

IPC: A61B6/04 ,  A61B6/00 ,  G02B5/18 ,  G21K1/10

Abstract: A grating based interferometric X-ray imaging apparatus having an interferometer (IF). The interferometer comprises at least one grating (G1). The grating (G1) is tiltable relative to an optical axis of the X-ray imaging apparatus. This allows changing a design energy of the X-ray imaging apparatus.

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

IPC: A61B6/03 ,  A61B6/00 ,  G01N23/20 ,  G21K1/06 ,  G21K1/10 ,  G02B5/18

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).

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：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：US09693438B2

公开(公告)日：2017-06-27

申请号：US14428016

申请日：2014-08-06

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Dominik Benjamin Kutra ,  Thomas Buelow ,  Gerhard Martens ,  Hanns-Ingo Maack ,  Kirsten Regina Meetz

IPC: H01J35/14 ,  H05G1/30 ,  G21K1/02

CPC classification number: H05G1/30 ,  G21K1/025

Abstract: X-ray apparatus, with a collimator arrangement (12a, 18, 28a) positioned between the focus point (12b) and the detector (28b), mechanics (43) for enabling motion of the collimator arrangement, the detector and the x-ray source along a scan trajectory (30) in a x-z plane (83) and also along curved scan trajectory (45), which partly extents along a y-axis (35) perpendicular to the x-z plane. By using this invention better tissue coverage of objects with curved edges can be obtained.

公开(公告)号：US09833202B2

公开(公告)日：2017-12-05

申请号：US15108401

申请日：2015-12-01

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Heiner Daerr ,  Roger Steadman Booker ,  Gereon Vogtmeier ,  Ewald Roessl ,  Gerhard Martens ,  Carolina Ribbing

IPC: H05G1/26 ,  A61B6/03 ,  A61B6/00 ,  A61B6/06

CPC classification number: A61B6/032 ,  A61B6/06 ,  A61B6/4042 ,  A61B6/4078 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/485 ,  A61B6/582 ,  H05G1/30 ,  H05G1/58

Abstract: The invention relates to a system (31) for generating spectral computed tomography projection data. A spectral projection data generation device (6) comprising an energy-resolving detector generates spectral computed tomography projection databased on polychromatic radiation (4), which has been provided by a radiation device (2), after having traversed an examination zone (5), and a reference values generation device generates energy-dependent reference values based on radiation, which has not traversed the examination zone. A spectral parameter providing unit (12) provides a spectral parameter being indicative of a spectral property of the radiation device based on the energy-dependent reference values. In particular, spectral properties of the radiation device can be monitored over time, wherein this information can be used for, for instance, correcting the spectral computed tomography projection data, and/or, if undesired spectral properties of the radiation device are indicated, triggering a replacement of the radiation device.