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公开(公告)号：US10094898B2
公开(公告)日：2018-10-09
申请号：US15102544
申请日：2014-12-08
发明人： Miha Fuderer
IPC分类号： G01V3/00 , G01R33/48 , G01R33/483
摘要： 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.
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公开(公告)号：US09841482B2
公开(公告)日：2017-12-12
申请号：US14421912
申请日：2013-08-29
IPC分类号： G06K9/00 , G01R33/561 , G01R33/56 , G01R33/34
CPC分类号： G01R33/5611 , G01R33/34 , G01R33/5608
摘要： 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.
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公开(公告)号：US20150212180A1
公开(公告)日：2015-07-30
申请号：US14421912
申请日：2013-08-29
IPC分类号： G01R33/561 , G01R33/34
CPC分类号： G01R33/5611 , G01R33/34 , G01R33/5608
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US11474170B2
公开(公告)日：2022-10-18
申请号：US17256702
申请日：2019-06-27
发明人： Miha Fuderer
摘要： 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.
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公开(公告)号：US11274857B2
公开(公告)日：2022-03-15
申请号：US15778082
申请日：2016-11-24
发明人： Thomas Erik Amthor , Miha Fuderer , Gerardus Bernardus Jozef Mulder , Christoph Leussler , Peter Forthmann , Philippe Abel Menteur
摘要： 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.
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公开(公告)号：US10996305B2
公开(公告)日：2021-05-04
申请号：US16462571
申请日：2017-11-20
IPC分类号： G01R33/561 , G01R33/48 , G01R33/50 , G06T11/00
摘要： 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.
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7.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
摘要： 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.
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公开(公告)号：US10401461B2
公开(公告)日：2019-09-03
申请号：US15544899
申请日：2016-01-25
发明人： Zhaolin Chen , Miha Fuderer
IPC分类号： G01V3/00 , G01R33/565 , G01R33/483 , G01R33/56 , G01R33/561
摘要： An object (10) placed in an examination volume of a MR device (1) is subject to an imaging sequence including multi-slice RF pulses for simultaneously exciting two or more spatially separate image slices. MR signals are received in parallel via a set of RF coils (11, 12, 13) having different spatial sensitivity profiles within the examination volume. An MR image is reconstructed for each image slice from the acquired MR signals. MR signal contributions from the different image slices are separated on the basis of the spatial sensitivity profiles of the RF coils (11, 12, 13). Side-band artifacts, namely MR signal contributions from regions excited by one or more side-bands of the multi-slice RF pulses, are suppressed in the reconstructed MR images on the basis of the spatial sensitivity profiles of the RF coils (11, 12, 13).
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公开(公告)号：US11639980B2
公开(公告)日：2023-05-02
申请号：US17613302
申请日：2020-05-25
发明人： Miha Fuderer , Elwin De Weerdt
摘要： 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 fast spiral MR imaging with a defined T2 contrast. The method of the invention comprises the following steps: —generating a number of spin echoes by subjecting the object (10) to one or 5 more shots of an imaging sequence, each shot comprising an RF excitation pulse (21) followed by a number of RF refocusing pulses (22), wherein modulated readout magnetic field gradients (23, 24) are applied in each interval between successive RF refocusing pulses (22), —acquiring MR signal data, wherein each spin echo is recorded along a spiral trajectory (31-33, 41-43) in k-space which winds around the k-space origin with varying radial distance, wherein the trajectory (31, 41) of at least one spin echo has a different rate of variation of the radial distance at least in a central k-space region compared to the trajectories (32, 33, 42, 43) of the other spin echoes, and—reconstructing an MR image from the acquired MR signal data. Moreover, the invention relates to an MR device (1) and to a computer program for an MR device (1).
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10.发明授权公开(公告)号：US11435417B2
公开(公告)日：2022-09-06
申请号：US16654058
申请日：2019-10-16
IPC分类号： G01R33/28 , G01R33/341 , G01R33/24 , G01R33/36
摘要： The present invention provides a radio frequency (RF) receive coil device for use in a magnetic resonance (MR) imaging system, comprising a RF receive coil, a plug for connecting the RF receive coil to the MR imaging system, sensing means for sensing the presence of a magnetic field of the MR imaging system, detecting means for detecting if the plug is connected to the MR imaging system, and a warning means for generating a warning when the sensing means sense the presence of a magnetic field of the MR imaging system and the detecting means detect that the plug is not connected to the MR imaging system.
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