公开(公告)号：US11744532B2

公开(公告)日：2023-09-05

申请号：US17282027

申请日：2019-09-27

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Michael Grass ,  Roland Proksa

IPC: A61B6/00 ,  A61B6/03 ,  G01N23/046 ,  G06T11/00 ,  A61B6/02 ,  G06T7/10 ,  G06T7/30

CPC classification number: A61B6/4241 ,  A61B6/025 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4035 ,  G01N23/046 ,  G06T7/10 ,  G06T7/30 ,  G06T11/003 ,  G01N2223/423 ,  G06T2207/10081

Abstract: The invention refers to a system for providing a spectral image using a conventional CT system. The system comprises a data providing unit (11) for providing first projection data and second projection data, wherein the first and second projection data have been acquired using different acquisition spectra, wherein the first projection data has been acquired during a scout scan and the second projection data has been acquired during a diagnostic scan, or wherein the first and second projection data have been acquired by a first and second part of the detector, respectively. The first and second part of the detector acquire projection data with different acquisition spectra. A spectral image generation unit (12) generates a spectral image based on the projection data. With this system a spectral image can be provided using a conventional CT system with a decreased acquisition time.

公开(公告)号：US11152129B2

公开(公告)日：2021-10-19

申请号：US16637876

申请日：2018-08-14

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Heiner Daerr ,  Roland Proksa

IPC: G21K1/02 ,  G01N23/046 ,  G01T1/20 ,  G01T1/24

Abstract: An anti-scatter grid (ASG) for X-ray imaging with a surface (S) formed from a plurality of strips (LAM). The plurality of strips including at least two guard strips (Li,Li+1) that are thicker in a direction parallel to said surface than one or more strips (li) of said plurality of strips (LAM). The one or more strips (li) being situated in between said two guard strips (Li,Li+1).

公开(公告)号：US11000251B2

公开(公告)日：2021-05-11

申请号：US16071513

申请日：2017-12-12

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Roland Proksa ,  Frank Josef Pfeiffer ,  Peter Benjamin Theodor Noel ,  Thomas Baum

IPC: A61B6/00 ,  A61B6/03 ,  A61B6/04 ,  G01T1/161

Abstract: The present invention relates to a CT imaging system as well as a method for CT imaging is provided. For CT imaging, in practice a scout scan and a main scan of a human subject may be performed. It has been found that a detector signal, provided by a detector which detects the X-ray radiation during the scout scan, may be used on the one hand for determining a respective scout image and on the other hand to determine the bone mineral density of the human subject. Although the scout scan is usually primarily performed for determining the scout image, it is of advantage, if the detector used for detecting the X-ray radiation during the scout scan is formed and/or configured to detect X-ray radiation of a first energy spectrum and to detect X-ray radiation of a different, second energy spectrum. In this case, the detector can provide more precise information about the scout region of the human subject and resulting therefrom in a more precise determination of the bone mineral density. Thus, while determining the scout image and/or while performing further steps, the bone mineral density may be determined, in particular as a background process step, such that the bone mineral density may be provided for further purpose.

公开(公告)号：US10983071B2

公开(公告)日：2021-04-20

申请号：US16305446

申请日：2018-05-02

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Heiner Daerr ,  Roland Proksa ,  Frank Bergner

IPC: G01N23/04 ,  A61B6/03 ,  G01T7/00 ,  G01N23/046 ,  A61B6/00

Abstract: The present invention relates to a photon scanning apparatus comprising a photon source (2) to emit a photon beam (4), a photon detector (6) to detect photons emitted from the photon source (2). The photon source (2) is adapted to emit the photon beam (4) in accordance with a predetermined pulse width modulation scheme at a predetermined flux rate, wherein the pulse width modulation scheme defines pulse widths of the photon beam (4) for respective positions of the photon source (2) and the photon detector around a central axis (R) and an object to be scanned. The photon detector (6) is adapted to start detecting photons with a delay relative to the photon source starting to emit photons and to finish detecting photons prior to the photon source stopping to emit photons. The photon scanning apparatus thus only has to be calibrated for the predetermined flux rate.

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：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：US09901311B2

公开(公告)日：2018-02-27

申请号：US14895384

申请日：2014-06-17

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Roland Proksa

IPC: A61B6/03 ,  A61B6/00

CPC classification number: A61B6/035 ,  A61B6/032 ,  A61B6/405 ,  A61B6/4291 ,  A61B6/5205 ,  A61B6/542

Abstract: The invention relates to an X-ray imaging apparatus and a method, particularly to a CT scanner (100) for generating sectional images of an object such as the body (P) of a patient. A given desired angular intensity distribution (Ides) is reproduced by emitting X-rays (X) in emission angle intervals (EAI) only, wherein the angular distribution of these emission angle intervals and the associated local emission intensities (I(α)) are chosen such that they reproduce, in the angular mean, the desired angular intensity distribution (Ides). Modulation of incident X-ray flux is hence realized by the modulation of the angular sampling density. The X-ray source may preferably be realized by a grid switching tube (101).

公开(公告)号：US09839404B2

公开(公告)日：2017-12-12

申请号：US14916592

申请日：2014-09-11

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Heike Ruppertshofen ,  Cristian Lorenz ,  Jens Wiegert ,  Peter Prinsen ,  Roland Proksa

IPC: A61B6/00 ,  A61B6/14 ,  A61C9/00 ,  A61B6/03 ,  A61B6/10 ,  A61N5/10 ,  G06T19/00 ,  G06F19/00 ,  G06T7/174 ,  G06T7/30

CPC classification number: A61B6/488 ,  A61B6/032 ,  A61B6/10 ,  A61B6/14 ,  A61B6/5229 ,  A61B6/5235 ,  A61B6/5247 ,  A61B6/542 ,  A61C9/0046 ,  A61C9/0053 ,  A61C9/006 ,  A61C9/0086 ,  A61N5/1031 ,  G06F19/00 ,  G06F19/321 ,  G06T7/174 ,  G06T7/30 ,  G06T19/006 ,  G06T2207/10081 ,  G06T2207/20221 ,  G06T2210/41

Abstract: A method for extending initial image data of a subject for dose estimation includes obtaining first image data of the subject for dose calculation, wherein the first image data has a first field of view. The method further includes obtaining second image data for extending the field of view of the first image data. The second image data has a second field of view that is larger than the first field of view. The method further includes extending the first field of view based on the second image data, producing extended image data.