公开(公告)号：US20230038530A1

公开(公告)日：2023-02-09

申请号：US17793422

申请日：2021-01-25

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Holger Eggers ,  Christian Stehning

IPC: G01R33/48 ,  G01R33/561 ,  G01R33/563

Abstract: The invention relates to a method of Dixon-type MR imaging. It is an object of the invention to provide a method that enables efficient and reliable Dixon water/fat separation, in particular using a bipolar acquisition strategy, while avoiding flow-induced leakage and swapping artifacts. According to the invention, an imaging sequence is executed which comprises at least one excitation RF pulse and switched magnetic field gradients, wherein pairs of echo signals are generated at two different echo times (TE1, TE2) and during two or more different cardiac phases (AW1, AW2). The echo signals are acquired and phase images are reconstructed therefrom. A final diagnostic image is reconstructed from the echo signal data using water/fat separation, wherein regions of flow and/or estimates of flow- induced phase errors are derived from the phase images to suppress or compensate for flow- induced leakage and/or swapping artifacts in the final diagnostic image. Therein, flow- induced phase offsets are determined by voxel-wise comparison of the phase images associated with the different cardiac phases. Moreover, the invention relates to a MR device (1) and to a computer program to be run on a MR device (1).

公开(公告)号：US10215820B2

公开(公告)日：2019-02-26

申请号：US14905880

申请日：2014-07-02

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Lingzhi Hu ,  Christian Stehning ,  Zhiqiang Hu ,  Lingxiong Shao

IPC: G01V3/00 ,  G01R33/48 ,  G01R33/56 ,  G01R33/58

Abstract: A medical imaging system (10) includes a magnetic resonance (MR) scanner (12), and a MR reconstruction unit (34). The MR scanner (12) applies a multi-echo ultra-short TE (UTE) with mDixon pulse sequence to a subject (16) and receives MR data (33) representing at least a portion of the subject. The MR reconstruction unit (34) reconstructs a Free Induction Decay (FID) image (120), and one or more echo magnitude images (122), one or more phase images (39), an in-phase image (39), a water image (39), and a fat image (39) from the received MR data (33).

公开(公告)号：US12251189B2

公开(公告)日：2025-03-18

申请号：US16972636

申请日：2019-06-04

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Sascha Krueger ,  Christian Stehning ,  Peter Mazurkewitz

IPC: A61B5/00 ,  A61B5/055 ,  A61N5/10 ,  G01R33/28 ,  G01R33/385 ,  G01R33/565

Abstract: The invention provides for a medical instrument (100, 300, 400, 500, 600) comprising a camera system (102, 102′, 102″) for imaging a portion (418) of a subject (108) reposing on a subject support (106). The medical instrument further comprises a display system (104) for rendering a position feedback indicator (130, 900). The display system is configured such that the position feedback indicator is visible to the subject when the subject is reposing on the subject support. The execution of the machine executable instructions (120) causes a processor (114) controlling the medical instrument to: acquire (200) a base position image (122) using the camera system; repeatedly (202) acquire a subsequent image (124) using the camera system; repeatedly (204) calculate an image transformation (126) from voxels of at least a portion of the base position image to voxels of the subsequent image by inputting the base position image and the subsequent image into an image transformation algorithm (128); and repeatedly (206) render a position feedback indicator (130, 900) on the display, wherein the position feedback indicator is controlled by the image transformation.

公开(公告)号：US11199601B2

公开(公告)日：2021-12-14

申请号：US16755894

申请日：2018-09-27

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Christian Stehning ,  Julien Senegas

IPC: G01R33/50 ,  G01R33/54 ,  G01R33/56

Abstract: A magnetic resonance imaging system that includes machine executable instructions to control the system with pulse sequence commands to acquire a series of magnetic resonance data and noise magnetic resonance data. The pulse sequence commands are configured to control the system to acquire a series of magnetic resonance data from a subject according to a quantitative magnetic resonance imaging protocol for quantitatively determining a relaxation time. The quantitative magnetic resonance imaging protocol includes pulse sequence repetition having a magnetic gradient portion, a radio frequency portion, and an acquisition portion. The quantitative magnetic resonance imaging protocol includes a pause cycle between at least two of the multiple pulse sequence repetitions, wherein the pulse sequence commands are configured for acquiring noise magnetic resonance data during the pause cycle using the magnetic gradient portion and the acquisition portion.

公开(公告)号：US10241182B2

公开(公告)日：2019-03-26

申请号：US14651496

申请日：2013-12-06

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Christian Stehning ,  Thomas Perkins ,  Julien Senegas ,  Jochen Keupp

IPC: G01R33/483 ,  G01R33/563 ,  G01R33/565

Abstract: A magnetic resonance imaging system (1) includes at least one processor (28) configured to receive (48) diffusion weighted imaging data based on a diffusion weighted imaging sequence with magnetic gradient fields applied in different directions and with different b-values. The at least one processor (28) is further configured to detect (50) motion corrupted data present in the received imaging data based on a comparison of data redundant in the received data, and substitute (52) alternative data for detected motion corrupted data.

公开(公告)号：US10185011B2

公开(公告)日：2019-01-22

申请号：US15302565

申请日：2015-04-10

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Christian Stehning ,  Ulrich Katscher ,  Thomas Heiko Stehle

IPC: G01V3/00 ,  G01R33/56 ,  A61B5/055 ,  G01R33/24 ,  G01R33/44 ,  A61B5/053

Abstract: An electric properties tomography method for reconstructing a spatial distribution of electric conductivity (σ) from magnetic resonance image data representative of a magnetic resonance image of at least a portion of a subject of interest (20), the spatial distribution covering at least a portion of the area of the magnetic resonance image, and the method comprising following steps:—segmenting the magnetic resonance image,—extrapolating acquired phase values, —replacing acquired phase values by the extrapolated phase values,—transforming into the frequency domain,—multiplying a frequency domain-transformed numerical second derivative by the acquired phase values and the frequency domain-transformed numerical second derivative by the extrapolated phase values, respectively, and—transforming the result of the multiplying into the spatial domain. Also covered are a corresponding MRI system and a software module.

公开(公告)号：US11940517B2

公开(公告)日：2024-03-26

申请号：US17793422

申请日：2021-01-25

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Holger Eggers ,  Christian Stehning

IPC: G01R33/48 ,  G01R33/561 ,  G01R33/563

CPC classification number: G01R33/4828 ,  G01R33/5615 ,  G01R33/56316

Abstract: The invention relates to a method of Dixon-type MR imaging. It is an object of the invention to provide a method that enables efficient and reliable Dixon water/fat separation, in particular using a bipolar acquisition strategy, while avoiding flow-induced leakage and swapping artifacts. According to the invention, an imaging sequence is executed which comprises at least one excitation RF pulse and switched magnetic field gradients, wherein pairs of echo signals are generated at two different echo times (TE1, TE2) and during two or more different cardiac phases (AW1, AW2). The echo signals are acquired and phase images are reconstructed therefrom. A final diagnostic image is reconstructed from the echo signal data using water/fat separation, wherein regions of flow and/or or estimates of flow-induced phase errors are derived from the phase images to suppress or compensate for flow-induced leakage and/or swapping artifacts in the final diagnostic image. Therein, flow-induced phase offsets are determined by voxel-wise comparison of the phase images associated with the different cardiac phases. Moreover, the invention relates to a MR device (1) and to a computer program to be run on a MR device (1).

公开(公告)号：US20150003703A1

公开(公告)日：2015-01-01

申请号：US14374652

申请日：2013-01-25

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Astrid Ruth Franz ,  Stefanie Remmele ,  Christian Stehning ,  Jochen Keupp

IPC: G01R33/56 ,  G06T15/08 ,  A61B5/055 ,  G06T7/00 ,  G01R33/563 ,  A61B6/00

CPC classification number: G06T7/11 ,  A61B5/0042 ,  A61B5/055 ,  A61B5/742 ,  A61B6/037 ,  A61B6/461 ,  A61B6/481 ,  A61B6/5211 ,  G01R33/4808 ,  G01R33/5601 ,  G01R33/563 ,  G06T7/0012 ,  G06T7/174 ,  G06T7/187 ,  G06T15/08 ,  G06T2207/10088 ,  G06T2207/10104 ,  G06T2207/20016 ,  G06T2207/20092 ,  G06T2207/20168 ,  G06T2207/30016 ,  G06T2207/30096

Abstract: A medical imaging system (5) includes a workstation (20), a coarse segmenter (30), a fine segmenter (32), and an enclosed tissue identification module (34). The workstation (20) includes at least one input device (22) for receiving a selected location as a seed in a first contrasted tissue type and a display device (26) which displays a diagnostic image delineating a first segmented region of a first tissue type and a second segmented region of a second contrasted tissue type and identified regions which include regions fully enclosed by the first segmented region as a third tissue type. The coarse segmenter (30) grows a coarse segmented region of coarse voxels for each contrasted tissue type from the seed location based on a first growing algorithm and a growing fraction for each contrasted tissue type. The seed location for growing the second contrasted tissue type includes the first coarse segmented region and any fully enclosed coarse voxels, and each coarse voxel includes an aggregation of voxels and a maximum and a minimum of the voxel intensities. The fine segmenter (32) grows a segmented region of voxels for each contrasted tissue type from the seed location and bounded by the second coarse segmented region based on a second growing algorithm and a growing fraction for each contrasted tissue type initially set to the growing fraction for the corresponding region. The seed location for growing the second contrasted tissue type includes the first segmented region and any identified regions. The enclosed tissue identification module (34) identifies any regions of voxels fully enclosed by the first segmented region as being of the third tissue type. The coarse segmenter, the fine segmenter, and the enclosed tissue identification module are implemented by an electronic data processing device.

Abstract translation: 医疗成像系统（5）包括工作站（20），粗分割器（30），精细分割器（32）和封闭的组织识别模块（34）。 工作站（20）包括至少一个输入装置（22），用于以第一对比组织类型的种子的形式接收所选择的位置，以及显示装置（26），其显示描绘第一组织类型的第一分割区域 以及第二对比组织类型的第二分割区域和被识别的区域，其包括由第一分割区域完全包围的区域作为第三组织类型。 粗分割器（30）基于第一生长算法和每个对比组织类型的生长部分，从种子位置为每个对比组织类型生长粗体素的粗分割区域。 用于生长第二对比组织类型的种子位置包括第一粗分段区域和任何完全封闭的粗体素，并且每个粗体素包括体素的聚集和体素强度的最大和最小值。 细分割器（32）基于第二种生长算法，从种子位置生长每个对比组织类型的分形区域，并由第二粗分段区域生长，并且对于初始设置为生长部分的每个对比组织类型的生长部分 对于相应的区域。 用于生长第二对比组织类型的种子位置包括第一分割区域和任何识别的区域。 封闭的组织识别模块（34）将由第一分段区域完全包围的体素的任何区域识别为第三组织类型。 粗分割器，精细分割器和封闭组织识别模块由电子数据处理装置实现。

公开(公告)号：US12042306B2

公开(公告)日：2024-07-23

申请号：US16492643

申请日：2018-03-16

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Julien Senegas ,  Sascha Krueger ,  Daniel Wirtz ,  Christian Stehning

IPC: A61B5/00 ,  A61B5/024 ,  A61B5/055 ,  A61B5/11 ,  A61B6/00 ,  A61B6/03 ,  A61B8/00 ,  G01R33/567 ,  G06T7/00 ,  G06T7/20

CPC classification number: A61B5/7292 ,  A61B5/0077 ,  A61B5/02438 ,  A61B5/055 ,  A61B5/1102 ,  A61B5/1128 ,  A61B5/6823 ,  A61B5/7425 ,  A61B6/032 ,  A61B6/037 ,  A61B6/541 ,  A61B8/543 ,  G01R33/5673 ,  G06T7/0016 ,  G06T7/20 ,  G06T7/97 ,  G06T2207/10016 ,  G06T2207/10088 ,  G06T2207/30076

Abstract: The invention provides for a medical apparatus (100, 200, 300, 500) comprising an optical imaging system (106) configured for acquiring a series of optical images (544) descriptive of cardiac motion of a subject (102). The medical apparatus further comprises a memory (534) for storing machine executable instructions (540). The medical apparatus further comprises a processor (530) for controlling the medical apparatus. Execution of the machine executable instructions causes the processor to repeatedly: acquire (400) a series of images using the optical imaging system, wherein the series of images are acquired at a rate of at least 10 frames per second; and derive (402) a cardiac motion signal (546) from the series of images, wherein the cardiac motion signal is derived by tracking motion of at least a group of pixels within the series of images.

公开(公告)号：US20240156346A1

公开(公告)日：2024-05-16

申请号：US18282243

申请日：2022-03-11

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Jochen Keupp ,  Jan Jakob Meineke ,  Christian Stehning ,  Christophe Michael Jean Schulke ,  Mariya Invanova Doneva ,  Peter Ulrich Börnert

IPC: A61B5/00 ,  A61B5/055 ,  G16H30/00

CPC classification number: A61B5/0044 ,  A61B5/055 ,  G16H30/00

Abstract: Disclosed herein is a medical system (100, 300, 700) comprising a magnetic resonance imaging system (102) configured to acquire lines of k-space (144) data from a thoracic region (122) of a subject (118). Execution of machine executable instructions (140) causes a computational system (132) to: repeatedly (200) acquire the lines of k-space data by controlling the magnetic resonance imaging system with the pulse sequence commands; repeatedly (202) assemble motion resolved k-space data (146) from the lines of k-space data using at least one cardiac phase and one respiratory phase of the subject as the k-space data is acquired; retrieve (204) at least a portion (148) of the motion resolved k-space data during acquisition of the k-space data; and construct (206) a preliminary three-dimensional cardiac image (150) using at least a portion of the motion resolved k-space data before acquisition of the lines of k-space data is finished. The pulse sequence commands are according to a three-dimensional free running cardiac magnetic resonance imaging protocol.