公开(公告)号：US10762672B2

公开(公告)日：2020-09-01

申请号：US15763140

申请日：2016-10-19

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Frank Bergner ,  Bernhard Johannes Brendel ,  Thomas Koehler

IPC: G06T11/00

Abstract: The present invention relates to a device for reconstructing an X-ray tomography image, the device comprising a reconstruction module, which is configured to utilize an ordered subset maximum likelihood optimization with a diagonal paraboloid approximation of a cost function for the reconstructing of the X-ray tomography image; and a calculation module, which is configured to calculate a pre-computable denominator term for the cost function for a plurality of subsets of projection data based on a distribution of diagonal denominator terms over the plurality of the subsets of the projection data.

公开(公告)号：US10736590B2

公开(公告)日：2020-08-11

申请号：US15509042

申请日：2015-09-16

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Dirk Schafer ,  Michael Grass ,  Thomas Koehler ,  Roland Proksa

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

Abstract: A method includes receiving radiation with a hybrid data detection system of an imaging system. The hybrid data detection system includes a hybrid data detector array with a set of spectral detectors and a set of integrating detectors that are arranged along a transverse axis of an examination region. The method further includes generating a set of truncated spectral projections with the first set of spectral detectors. The method further includes estimating a set of spectral projections for the integrating detectors. The method further includes combining the set of truncated spectral projections and the estimated set of spectral projections. The method further includes estimating a set of spectral projections based on the combined set to produce a complete set of spectral projections. The method further includes processing the complete set of spectral projections to generate volumetric image data.

公开(公告)号：US10420519B2

公开(公告)日：2019-09-24

申请号：US15523690

申请日：2015-11-04

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Roland Proksa ,  Michael Grass

IPC: G06K9/00 ,  A61B6/03 ,  A61B6/02 ,  A61B6/00

Abstract: The invention relates to a computed tomography system (30). Several sets of spectral projections, which correspond to different positions of a radiation source (2) along a rotation axis (R), are decomposed into first projections being indicative of a contrast agent and second projections being not indicative of the contrast agent. An image is generated by a) determining for each first projection a contrast value being indicative of a total amount of contrast agent and scaling the first projections such that for different first projections of a same set the same contrast value is determined, and reconstructing an image based on the scaled first projections, and/or b) reconstructing for the different sets first images, scaling the first images such that they have a same intensity in overlap regions and combining the scaled first images. Thus, different contrast agent amounts can be balanced, thereby allowing for an improved image quality.

公开(公告)号：US10373349B2

公开(公告)日：2019-08-06

申请号：US15125608

申请日：2015-03-18

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Axel Thran ,  Frank Bergner ,  Bernhard Johannes Brendel ,  Rolf Dieter Bippus

IPC: G06T11/00

Abstract: The invention relates to an image generation apparatus (1) for generating an image of an object. A reconstruction unit (10) reconstructs the image based on provided measured projection values such that costs defined by a cost function are reduced, wherein the cost function depends on differences between calculated projection values, which have been determined by simulating a forward projection through the image, and the provided measured projection values, and wherein a degree of dependence of the cost function on a respective difference depends on the respective difference. This can allow for a consideration of a degree of disturbance of the measured projection values by motion and/or by an incomplete illumination of the object during the reconstruction process, which can lead to a reconstruction of an image having an improved image quality.

公开(公告)号：US10339674B2

公开(公告)日：2019-07-02

申请号：US15328645

申请日：2015-08-04

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Bernhard Johannes Brendel

IPC: G06K9/00 ,  G06T11/00 ,  A61B6/00 ,  G01N23/04 ,  G01N23/046

Abstract: A signal processing apparatus and a related method. In particular, the apparatus includes a novel image reconstructor to reconstruct cross sectional images of a specimen from interferometric projection data (m). The reconstructor (RECON) is based on a new forward model that accounts for cross-talk of a phase contrast signal into a dark field signal.

公开(公告)号：US10080533B2

公开(公告)日：2018-09-25

申请号：US15104024

申请日：2014-12-16

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Ewald Roessl ,  Heiner Daerr ,  Thomas Koehler

IPC: G01T1/24 ,  A61B6/00 ,  A61B6/03 ,  H01J35/10 ,  H05G1/60 ,  H01J35/06 ,  H05G1/56

CPC classification number: A61B6/4241 ,  A61B6/032 ,  A61B6/035 ,  A61B6/405 ,  A61B6/482 ,  A61B6/542 ,  G01T1/247 ,  H01J35/06 ,  H01J35/10 ,  H01J2235/086 ,  H05G1/56 ,  H05G1/60

Abstract: An imaging system (100) includes a radiation source (110) with a focal spot (204) that emits a beam of x-ray photons that traverses an examination region (106). The imaging system further includes a photon counting detector array (122) that detects a sub-set of the x-ray photons that traverse an examination region. The imaging system further includes a controller (116) that generates and transmits a pause signal, in response to a calculated drop in an intensity of the emitted the beam of x-ray photons below a predetermined intensity level, which causes the photon counting detector array to pause detecting the sub-set of the x-ray photons. The imaging system further includes a counter (136) that counts, for each of a plurality of counting periods, the x-ray photons of the sub-set detected by the photon counting detector array in the corresponding counting period.

公开(公告)号：US09761023B1

公开(公告)日：2017-09-12

申请号：US14917615

申请日：2015-07-29

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Frank Bergner ,  Roland Proksa

IPC: G06T11/00

CPC classification number: G06T11/006 ,  G06T2211/408 ,  G06T2211/424

Abstract: The present invention relates to a device (100) for iterative reconstruction of images recorded by at least two imaging methods, the device comprising: an extraction module (10), which is configured to extract a first set of patches from a first image recorded by a first imaging method and to extract a second set of patches from a second image recorded by a second imaging method; a generation module (20), which is configured to generate a set of reference patches based on a merging of a first limited number of atoms for the first set of patches and of a second limited number of atoms for the second set of patches; and a regularization module (30), which is configured to perform a regularization of the first image or the second image by means of the generated set of reference patches.

公开(公告)号：US09640293B2

公开(公告)日：2017-05-02

申请号：US14785644

申请日：2014-11-12

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Ewald Roessl ,  Thomas Koehler

IPC: G21K1/06

CPC classification number: G21K1/065 ,  G21K1/06 ,  G21K2207/005

Abstract: The invention relates to a grating arrangement and a method for spectral filtering of an X-ray beam (B), the grating arrangement comprising: a dispersive element (10) comprising a prism configured to diffract the X-ray beam (B) into a first beam component (BC1) comprising a first direction (D1) and a second beam component comprising (BC2) a second direction (D2), tilted with respect to the first direction; a first grating (20) configured to generate a first diffraction pattern (DP1) of the first beam component (BC1) and a second diffraction pattern (DP2) of the second beam component (BC2), the second diffraction pattern (DP2) shifted with respect to the first diffraction patter (DP1); and a second grating (30) comprising at least one opening (31) which is aligned along a line (d) from a maximum (MA) to a minimum (MI) of intensity of the first diffraction pattern (DP1) or of the second diffraction pattern (DP2).

公开(公告)号：US09538970B2

公开(公告)日：2017-01-10

申请号：US14370301

申请日：2012-12-26

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Ewald Roessl

IPC: A61B6/00

CPC classification number: A61B6/484 ,  A61B6/482

Abstract: A system and method for generating phase image data by using the same detector to simultaneously operate in two different modes to simultaneously obtain first and second x-ray image data with different spectral weightings. The first and second x-ray image data respectively include first and second pixel-wise measurement signal values. The detector is configured to obtain the first x-ray image data in a first measurement mode and obtain the second x-ray image data in a second measurement mode different from the first measurement mode for generating the phase image data. The generated phase image data includes pixel-wise phase values from the first and second x-ray image data and is determined by determining a phase value at a pixel from a first measurement signal value obtained in the first measurement mode at the pixel, and from a second measurement signal value obtained in the second measurement mode at the pixel.

Abstract translation: 一种用于通过使用相同检测器以两种不同模式同时操作以同时获得具有不同频谱权重的第一和第二X射线图像数据来产生相位图像数据的系统和方法。 第一和第二X射线图像数据分别包括第一和第二像素测量信号值。 检测器被配置为以第一测量模式获得第一x射线图像数据，并且以与用于生成相位图像数据的第一测量模式不同的第二测量模式获得第二X射线图像数据。 生成的相位图像数据包括来自第一和第二X射线图像数据的像素相位值，并且通过从在像素处的第一测量模式中获得的第一测量信号值确定像素处的相位值，并且从 在该像素处以第二测量模式获得的第二测量信号值。

公开(公告)号：US12165325B2

公开(公告)日：2024-12-10

申请号：US17436095

申请日：2020-03-12

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Koehler ,  Michael Grass

IPC: G06T7/00 ,  A61B6/00 ,  A61B6/03 ,  A61B6/40 ,  A61B6/42 ,  A61B18/14 ,  G06T7/11 ,  G06T7/30 ,  A61B18/00 ,  A61B18/02

Abstract: The present invention relates to the use of dark field X-ray images in an ablation treatment of a tumour. By acquiring dark field X-ray images displaying the region of interest targeted in the ablation treatment, information can be derived which allows taking a decision on terminating the ablation treatment. A set of dark field X-ray images is received (101), which is acquired at different time instants and comprises the region of interest. Dark field X-ray images of the set are compared (102), for example by determining difference images between the individual images. If during that comparison a change in the dark field X-ray images is detected over time in the region of interest, then a signal is generated (103) indicating a change has occurred. That signal may indicate that healthy tissue is being affected instead of the tumour and that consequently the ablation treatment should be ended.