公开(公告)号：US10945691B2

公开(公告)日：2021-03-16

申请号：US16497066

申请日：2018-02-27

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Andriy Yaroshenko

IPC: A61B6/00 ,  A61B6/08

Abstract: The present invention relates to grating based Dark-Field and/or phase-contrast X-ray imaging. In order to improve the quality of an image, a radiography system (10) for grating based Dark-Field and/or phase-contrast X-ray imaging for imaging a patient by irradiating the patient is provided. The system comprises a source unit (12), a detection unit (14) and a patient support unit (16) with a patient abutting surface (18). The source unit (12) and the detection unit (14) are arranged along an optical axis (13) and the patient support unit (16) is arranged in between. Further, an abutting distance (dA) between the source unit (12) and the patient abutting surface (18) along the optical axis (13) is adaptable. The abutting distance (dA) and an actual sensitivity, based on the abutting distance (dA), are taken into account for imaging, such that a trade-off between sensitivity and field of view in a patient specific manner is achievable, e.g. the best trade-off.

公开(公告)号：US10779789B2

公开(公告)日：2020-09-22

申请号：US15031819

申请日：2014-10-30

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Bernhard Johannes Brendel

IPC: A61B6/00 ,  A61B6/03 ,  G01N23/046 ,  G01N23/205

Abstract: A beam hardening correction method, a related calibration method for tomographic image data and a related apparatus. The tomographic image data includes attenuation data (f) and phase gradient data (g) and/or small angle scattering data (h). A correction value is computed from the attenuation data (f) by applying a function (q) to the attenuation data (f). The correction value is combined (S445) with the phase gradient data (g) or with the small angle scattering data (h).

公开(公告)号：US10580138B2

公开(公告)日：2020-03-03

申请号：US15574173

申请日：2016-06-15

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Roland Proksa

IPC: G06T7/13 ,  G06T7/174 ,  G06T7/187

Abstract: An image processing system comprising: an input port (IN) for receiving two input images acquired of an object. Respective contrast in said images encodes information on different physical properties of the object. The images being converted from a signal detected at a detector (D) of an imaging apparatus (IM). A differentiator of the image processing system forms respective differences from pairs of image points from the respective input images. An edge evaluator (EV) computes, based on said differences, an edge score for at least one of said pairs of image points. The score is based on a measure that represents or is derivable from a conditional noise likelihood function. The likelihood function is based on a probability density that models noise for said signal. Said score is output through an output port (OUT).

公开(公告)号：US10568588B2

公开(公告)日：2020-02-25

申请号：US15580341

申请日：2016-06-10

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Franz Pfeiffer ,  Peter Benjamin Theodor Noel ,  Dieter Richard Hahn

IPC: G03G13/05 ,  A61B6/03 ,  A61B6/00 ,  G01N23/046

Abstract: Radiation source and detector arrangement for a differential phase contrast CT scanner, in which the detector tiles are placed asymmetrically such that direct rays, which hit gaps between tiles are sampled by tile centers for the complementary rays. This may provide for good image quality without any approximate processing.

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：US10297049B2

公开(公告)日：2019-05-21

申请号：US15533468

申请日：2015-11-26

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Bernhard Johannes Brendel ,  Frank Bergner

IPC: G06T11/00 ,  G06T5/00 ,  G06T5/50

Abstract: An image processing system (IPS) and related method to transform different multi-modal or multi-contrast input images (u,v) into respective transformed images (U,V). The transformation may proceed iteratively to improve a regularized objective function. The regularization is via a regularizer function (R). The regularizer function (R) is computed from noise normalized gradients of the two or more transformed images (u,v).

公开(公告)号：US10275859B2

公开(公告)日：2019-04-30

申请号：US15534536

申请日：2016-09-14

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Bernhard Johannes Brendel ,  Gilad Shechter ,  Liran Goshen ,  Thomas Koehler

IPC: G06K9/00 ,  G06T5/00 ,  G06T11/00 ,  A61B6/00 ,  G06T5/50

Abstract: The invention relates to an X-ray imaging device (10) for an object, an X-ray imaging system (100) for an object, an X-ray imaging method for an object, and a computer program element for controlling such device or system and a computer readable medium having stored such computer program element. The X-ray imaging device (10) comprises a receiving unit (11) and a processing unit (12). The receiving unit (11) is configured to receive attenuation data representing attenuation properties of the object for at least two different X-ray spectra. The processing unit (12) is configured to decompose the attenuation data into decomposed data, to reduce noise in the decomposed data to obtain de-noised data, to back-convert the de-noised data into back-converted attenuation data, to combine back-converted attenuation data and the attenuation data into combined attenuation data, and to decompose the combined attenuation data into combined decomposed data.

公开(公告)号：US10064586B2

公开(公告)日：2018-09-04

申请号：US15104003

申请日：2014-12-05

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Michael Grass

IPC: G01N23/00 ,  A61B6/03 ,  G01N23/046 ,  G06T11/00 ,  A61B6/00

Abstract: The invention relates to a projection data acquisition apparatus (14) for acquiring projection data for being used for reconstructing a computed tomography image. In acquisition intervals projection data are acquired only at certain acquisition rotational positions of a radiation source (2) relative to an object, wherein an acquisition rotational position of a current acquisition interval divides a largest non-acquisition angular region covering rotational positions, at which projection data have not already been acquired, into two smaller non-acquisition angular regions. Because of this acquisition of the projection data, after each acquisition interval the acquisition rotational positions, at which projection data have been acquired already, are relatively homogeneously distributed. This allows for an improved image quality of a computed tomography image which is reconstructed based on the acquired projection data.

公开(公告)号：US10055859B2

公开(公告)日：2018-08-21

申请号：US15317133

申请日：2015-06-16

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Roland Proksa ,  Michael Grass ,  Thomas Koehler

IPC: G06T11/00 ,  A61B6/03 ,  A61B6/00

CPC classification number: G06T11/005 ,  A61B6/027 ,  A61B6/032 ,  A61B6/488 ,  A61B6/5205 ,  A61B6/5235 ,  G06T2211/412 ,  G06T2211/436

Abstract: The invention relates to a CT imaging apparatus and a method for generating sectional images of an object such as a patient on a patient table. According to one embodiment, first projections (P) are generated along a first helical scanning path (Tr1) of a first X-ray source according to a sparse angular sampling scheme. Additional projections (Q1, Q2, R1) may dynamically be introduced along said first helical scanning path (Tr1) and/or along a second helical scanning path (Tr2) of an additional X-ray source based on the evaluation of previous projections (P1).

公开(公告)号：US09760992B2

公开(公告)日：2017-09-12

申请号：US14917093

申请日：2014-09-17

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Bernhard Johannes Brendel ,  Thomas Koehler ,  Rolf Dieter Bippus ,  Roland Proksa

IPC: G06K9/40 ,  G06T7/00 ,  G06T11/00 ,  A61B6/03 ,  A61B6/00 ,  G06K9/62 ,  G06T1/20 ,  G06T11/60 ,  G06T7/246

CPC classification number: G06T7/0012 ,  A61B6/032 ,  A61B6/5264 ,  G06K9/6202 ,  G06T1/20 ,  G06T7/246 ,  G06T11/006 ,  G06T11/60 ,  G06T2207/10081 ,  G06T2211/412 ,  G06T2211/421 ,  G06T2211/424

Abstract: A method includes re-sampling current image data representing a reference motion state into a plurality of different groups, each group corresponding to a different motion state of moving tissue of interest, forward projecting each of the plurality of groups, generating a plurality of groups of forward projected data, each group of forward projected data corresponding to a group of the re-sampled current image data, determining update projection data based on a comparison between the forward projected data and the measured projection data, grouping the update projection data into a plurality of groups, each group corresponding to a different motion state of the moving tissue of interest, back projecting each of the plurality of groups, generating a plurality of groups of update image data, re-sampling each group of update image data to the reference motion state of the current image, and generating new current image data based on the current image data and the re-sampled update image data.