-
公开(公告)号：US20230417850A1
公开(公告)日：2023-12-28
申请号：US18035949
申请日：2021-11-02
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Miha Fuderer
IPC: G01R33/48 , G01R33/565
CPC classification number: G01R33/4826 , G01R33/56563
Abstract: The invention relates to a method of MR imaging of an object (10) positioned in an examination volume of a MR device (1). It is an object of the invention to enable efficient spiral MR imaging without blurring artefacts, even in situations of strong B0 inhomogeneity. The method of the invention comprises the following steps: —subjecting the object (10) to an imaging sequence comprising at least one RF excitation pulse and modulated magnetic field gradients, —acquiring MR signals along two or more planar spiral k-space trajectories (31, 32, 33), wherein the radial k-space speed, i.e. the rate of variation of the radial distance from the spiral origin is essentially constant along each planar spiral k-space trajectory, and wherein the two or more k-space trajectories (31, 32, 33) are offset in-plane from each other, and—reconstructing an MR image from the acquired MR signals. Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).
-
公开(公告)号：US11852708B2
公开(公告)日：2023-12-26
申请号：US17617957
申请日：2020-06-11
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Miha Fuderer , Elwin De Weerdt
IPC: G01R33/56 , A61B5/0537 , G01R33/48 , G06T5/00
CPC classification number: G01R33/5608 , A61B5/0537 , G01R33/4818 , G06T5/006 , G06T2207/10088
Abstract: Disclosed herein is a medical system (100, 300, 500) comprising: a memory (110) storing machine executable instructions (120) and a processor (104). Execution of the machine executable instructions causes the processor to: receive (200) magnetic resonance imaging data (122), wherein the magnetic resonance imaging data has a spiral k-space sampling pattern; reconstruct (202) at least one preliminary magnetic resonance image (124) from the magnetic resonance imaging data; construct (204) a first set of equations comprising (130) each of the at least one preliminary magnetic resonance image being equal to an image transformation of at least one clinical image, wherein the image transformation makes use of a first spatially dependent kernel for each of the at least one clinical image (126, 126′, 126″); construct (206) a second set of equations (134) comprising at least one regularization matrix (132, 132′, 132″) times the at least one clinical image; and numerically (208) solve the first set of equations and the second set of equations simultaneously for the at least one clinical image.
-
公开(公告)号：US10094898B2
公开(公告)日：2018-10-09
申请号：US15102544
申请日：2014-12-08
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Miha Fuderer
IPC: G01V3/00 , G01R33/48 , G01R33/483
Abstract: The invention relates to a method of MR imaging of an object positioned in an examination volume of a MR device (1), the method comprises the steps of:—subjecting the object (10) to an imaging sequence of RF pulses (20) and switched magnetic field gradients(G), which imaging sequence is a zero echo time sequence comprising: i) setting a readout magnetic field gradient (G) having a readout direction and a readout strength; ii) radiating a RF pulse (20) in the presence of the readout magnetic field gradient (G); iii) acquiring a FID signal in the presence of the readout magnetic field gradient (G), wherein the FID signal represents a radial k-space sample; iv) gradually varying the readout direction; v) sampling a spherical volume in k-space by repeating steps i) through iv) a number of times, with the readout strength being varied between repetitions;—reconstructing a MR image from the acquired FID signals, wherein signal contributions of two or more chemical species to the acquired FID signals are separated. It is an object of the invention to enable silent ZTE imaging in combination with water/fat separation. This is achieved by varying the readout strength such that each position in k-space is sampled at least two times, each time with a different value of the readout strength. Moreover, the invention relates to a MR device and to a computer program for a MR device.
-
公开(公告)号：US09841482B2
公开(公告)日：2017-12-12
申请号：US14421912
申请日：2013-08-29
Applicant: KONINKLIJKE PHILIPS N.V.
IPC: G06K9/00 , G01R33/561 , G01R33/56 , G01R33/34
CPC classification number: G01R33/5611 , G01R33/34 , G01R33/5608
Abstract: A magnetic resonance imaging system (1) includes a denoising unit (24), and a reconstruction unit (20). The denoising unit (24) denoises a partial image and provides a spatially localized measure of a denoising effectivity. The reconstruction unit (20) iteratively reconstructs an output image from the received MR data processed with a Fast Fourier Transform (FFT), and in subsequent iterations includes the denoised partial image and the spatially localized measure of the denoising effectivity.
-
公开(公告)号：US20150212180A1
公开(公告)日：2015-07-30
申请号：US14421912
申请日：2013-08-29
Applicant: KONINKLIJKE PHILIPS N.V.
IPC: G01R33/561 , G01R33/34
CPC classification number: G01R33/5611 , G01R33/34 , G01R33/5608
Abstract: A magnetic resonance imaging system (1) includes a denoising unit (24), and a reconstruction unit (20). The denoising unit (24) denoises a partial image and provides a spatially localized measure of a denoising effectivity. The reconstruction unit (20) iteratively reconstructs an output image from the received MR data processed with a Fast Fourier Transform (FFT), and in subsequent iterations includes the denoised partial image and the spatially localized measure of the denoising effectivity.
Abstract translation: 磁共振成像系统（1）包括去噪单元（24）和重建单元（20）。 去噪单元（24）去除部分图像，并提供去噪有效性的空间局部测量。 重建单元（20）从用快速傅里叶变换（FFT）处理的接收的MR数据中迭代地重建输出图像，并且在随后的迭代中包括去噪部分图像和去噪有效性的空间局部测量。
-
Patent Agency Ranking
公开(公告)号：US11959986B2
公开(公告)日：2024-04-16
申请号：US16979940
申请日：2019-03-05
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Miha Fuderer , Silke Hey
IPC: G01R33/48 , G01R33/24 , G01R33/565
CPC classification number: G01R33/4826 , G01R33/243 , G01R33/4828 , G01R33/56563
Abstract: The invention relates to a method of MR imaging of an object (10) positioned in an examination volume of a MR device (1). It is an object of the invention to enable efficient spiral MR imaging even in situations of strong Bo inhomogeneity. The method of the invention comprises: subjecting the object (10) to an imaging sequence comprising at least one RF excitation pulse and sinusoidally modulated magnetic field gradients, acquiring MR signals along two or more spiral k-space trajectories (31, 32, 33) as determined by the sinusoidal modulation of the magnetic field gradients, wherein the origins of the spiral k-space trajectories are offset from each other, and reconstructing an MR image from the acquired MR signals. Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).
-
公开(公告)号：US11474170B2
公开(公告)日：2022-10-18
申请号：US17256702
申请日：2019-06-27
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Miha Fuderer
Abstract: A B0-mapping method determines the spatial distribution of a static magnetic field in a pre-selected imaging zone comprising computation of the spatial distribution of a static magnetic field from a spatial distribution of spin-phase accruals between magnetic resonance echo signals from the imaging zone and an estimate of the proton density distribution in the imaging zone. The invention provides the field estimate also in cavities and outside tissue. Also the field estimate of the invention suffers less from so-called phase-wraps.
-
公开(公告)号：US11274857B2
公开(公告)日：2022-03-15
申请号：US15778082
申请日：2016-11-24
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Thomas Erik Amthor , Miha Fuderer , Gerardus Bernardus Jozef Mulder , Christoph Leussler , Peter Forthmann , Philippe Abel Menteur
Abstract: A cryogenic cooling system (10) comprising a cryostat (12), a two-stage cryogenic cold head (24) and at least one thermal connection member (136; 236; 336; 436) that is configured to provide at least a portion of a heat transfer path (138; 238; 338; 438) from the second stage member (30) to the first stage member (26) of the two-stage cryogenic cold head (24). The heat transfer path (138; 238; 338; 438) is arranged outside the cold head (24). A thermal resistance of the provided at least portion of the heat transfer path (138; 238; 338; 438) at the second cryogenic temperature is larger than a thermal resistance of the provided at least portion of the heat transfer path (138; 238; 338; 438) at the first cryogenic temperature.
-
公开(公告)号：US10996305B2
公开(公告)日：2021-05-04
申请号：US16462571
申请日：2017-11-20
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Gabriele Marianne Beck , Miha Fuderer , Johan Samuel Van Den Brink , Patrick Gross
IPC: G01R33/561 , G01R33/48 , G01R33/50 , G06T11/00
Abstract: A method of MR imaging of a body (10) of a patient reduces contrast blurring in PROPELLER imaging combined with multi-echo acquisitions. The method includes the steps of: generating MR signals by subjecting at least a portion of the body (10) to a MR imaging sequence including a number of RF pulses and switched magnetic field gradients; acquiring the MR signals as a plurality of k-space blades (21-26) in temporal succession according to a PROPELLER scheme, each k-space blade (21-26) including a number of substantially parallel k-space lines, wherein the k-space blades (21-26) are rotated about the center of k-space, so that a total acquired data set of MR signals spans at least part of a circle in k-space, wherein a common central circular region of k-space is covered by all k-space blades (21-26), wherein a relaxation weighting of the MR signals varies between different k-space blades (21-26); estimating the relaxation weighting of the MR signals; compensating the acquired MR signals according to the estimated relaxation weighting; and reconstructing a MR image from the compensated MR signals.
-
10.发明授权公开(公告)号：US10416260B2
公开(公告)日：2019-09-17
申请号：US14351753
申请日：2012-10-12
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Miha Fuderer , Jeroen Alphons Pikkemaat
Abstract: A magnetic field within a magnetic resonance (MR) imaging system (300) is measured. The MR system includes a magnet (304) with an imaging zone (308), a radio-frequency transceiver (316), and a magnetic field probe (322) located within the imaging zone. The magnetic field probe includes a fluorine sample (404) including any one of the following: a fluoroelastomer (700), a fluorine containing ionic liquid (600), and a solution of a fluorine containing compound. The field probe further includes an antenna (406) for manipulating the magnetic spins of the fluorine sample and for receiving fluorine magnetic resonance data from the fluorine sample. The antenna is connected to the radio-frequency transceiver. The method includes acquiring (100, 200) the fluorine magnetic resonance data using the magnetic resonance imaging system and calculating (102, 206) a magnetic field strength (344) using the fluorine magnetic resonance data.
-
-
-
-
-
-
-
-
-
Search Results
28
records
(took 0.018 seconds)
