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1. 发明授权

US12019134B2 MR electric properties tomography without contrast agent 有权
公开(公告)号：US12019134B2
公开(公告)日：2024-06-25
申请号：US17617955
申请日：2020-06-19
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Ulrich Katscher , Johan Samuel Van Den Brink , Jochen Keupp
IPC分类号： G01R33/561 , A61B5/00 , A61B5/0536 , G01R33/56 , G01R33/563
CPC分类号： G01R33/5613 , A61B5/004 , A61B5/0536 , G01R33/5607 , G01R33/5608 , G01R33/5615 , G01R33/56341
摘要： A method of magnet resonance (MR) imaging of an object includes MR signal acquisition in a single scan providing information for electric properties imaging (EPT), which may include a phase map as well as tissue boundaries. The method includes: subjecting the object to a multi echo steady state imaging sequence or a fast spectroscopic imaging sequence that includes RF pulses and switched magnetic field gradients, wherein two or more echo signals are generated after each RF excitation; acquiring the echo signals; deriving a magnitude image and a phase map from the acquired echo signals, which phase map represents the spatial RF field distribution induced by the RF pulses in the object; and reconstructing an electric conductivity map from the magnitude image and from the phase map, wherein tissue boundaries are derived from at least the magnitude image.

2. 发明授权

US11782116B2 Method for recording a magnetic resonance image dataset, data medium, computer program product, and magnetic resonance installation 有权
公开(公告)号：US11782116B2
公开(公告)日：2023-10-10
申请号：US17393962
申请日：2021-08-04
申请人： Siemens Healthcare GmbH
发明人： Manuel Stich , Richard Dederichs , Herbert Köstler , Tobias Wech , Anne Slawig
IPC分类号： G01R33/56 , G01R33/565 , G01R33/561
CPC分类号： G01R33/56572 , G01R33/5613
摘要： A method for recording a magnetic resonance image dataset includes providing a magnetic resonance sequence with a series of sequence blocks, and providing at least one correction term to compensate for a magnetic field change. The magnetic field change is produced as a change of an actual magnetic field compared to a setpoint magnetic field by gradient pulses. The magnetic field change is established via a transfer characteristic of the gradient system of the magnetic resonance installation. The at least one correction term is used to compensate for the magnetic field change, and at least one magnetic resonance image dataset is recorded with the magnetic resonance sequence using the correction term.

3. 发明授权

US10613173B2 Method and magnetic resonance apparatus for generating a fat fraction-corrected T1 parameter map 有权
$Method and magnetic resonance apparatus for generating a fat fraction-corrected T1 parameter map$
公开(公告)号：US10613173B2
公开(公告)日：2020-04-07
申请号：US15946802
申请日：2018-04-06
申请人： Siemens Healthcare GmbH , Duke University
发明人： Stephan Kannengiesser , Berthold Kiefer , Mustafa R. Bashir , Claudia Fellner , Marcel Dominik Nickel
IPC分类号： G01R33/48 , G01R33/56 , G01R33/565 , A61B5/055 , G01R33/50 , A61B5/00 , G01R33/561
CPC分类号： G01R33/4828 , A61B5/055 , A61B5/4244 , A61B5/4872 , G01R33/50 , G01R33/5602 , G01R33/565 , G01R33/5608 , G01R33/5613
摘要： In a magnetic resonance (MR) apparatus and a method for operating such an apparatus, a T1 parameter map is generated with fat fraction correction, by using a model in which the fat fraction of acquired MR data is used as a known parameter. The T1 values from the acquired MR data are fat fraction-corrected in such a manner, so as to generate fat fraction-corrected entries for the T1 parameter map according to the model.

4. 发明授权

US10073156B2 Methods and systems for improved magnetic resonance acquisition 有权
公开(公告)号：US10073156B2
公开(公告)日：2018-09-11
申请号：US14412070
申请日：2013-06-28
申请人： SyntheticMR AB
发明人： Marcel Warntjes
IPC分类号： G01V3/00 , G01R33/50 , G01R33/561 , G01R33/563 , G01R33/56
CPC分类号： G01R33/50 , G01R33/5602 , G01R33/5613 , G01R33/5616 , G01R33/56341
摘要： A magnetic resonance imaging apparatus and method simultaneously measure physical properties including relaxation rates, proton densities, and apparent diffusion coefficients of a subject. The apparatus and method use a single magnetic resonance acquisition of the subject in order to measure the physical properties.

5. 发明申请

US20180136300A1 METHOD AND DEVICE FOR IMAGING BY MAGNETIC RESONANCE 审中-公开
公开(公告)号：US20180136300A1
公开(公告)日：2018-05-17
申请号：US15573340
申请日：2016-05-12
申请人： UNIVERSITE PARIS-SUD , CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
发明人： Ludovic Marie Xavier DE ROCHEFORT
IPC分类号： G01R33/58 , G01R33/50 , G01R33/561 , G01R33/563
CPC分类号： G01R33/586 , G01R33/448 , G01R33/50 , G01R33/54 , G01R33/5613 , G01R33/56341
摘要： A MRI device includes: structure applying a main magnetic field on an axis Z over a sample zone; structure emitting a magnetic field gradient and structure emitting a radiofrequency pulse, and a controller. The controller performs on the sample zone, a sequence including: a radiofrequency pulse and/or phase at each repetition; and a spatial gradient of the component along the Z axis. The controller is programmed so that, in the course of repeated applications of the pulse and of the gradient of the sequence of one and the same set: the radio frequency pulse follows, between its repeated applications, a periodic series for its amplitude and for a series U+t=v+i−v; and each repeated application of the gradient of magnetic field of the sequence a, according to a coding spatial direction, a non zero timing integral equal to A and identical for each application of gradient of this set.

6. 发明授权

US09625547B2 Magnetic resonance imaging method for the quantification of the T1 and/or T2 relaxation times in a sample 有权
公开(公告)号：US09625547B2
公开(公告)日：2017-04-18
申请号：US13852239
申请日：2013-03-28
申请人： UNIVERSITATSSPITAL BASEL
发明人： Rahel Heule , Oliver Bieri
IPC分类号： G01V3/00 , G01R33/44 , G01R33/561
CPC分类号： G01R33/448 , G01R33/5613
摘要： A magnetic resonance imaging (MRI) method for the quantification of the longitudinal (T1) and/or transverse (T2) relaxation times in a sample. According to the MRI method, a sample is subjected to an unbalanced steady state free precession (SSFP) sequence comprising a series of consecutive radiofrequency (RF) pulses. By means of the unbalanced SSFP sequence, a first order SSFP FID signal (F1), a lowest order SSFP FID signal (F0), and a lowest order SSFP Echo signal (F−1) are acquired. Based on the F0-signal, the F1-signal and the F−1-signal, the longitudinal (T1) and/or transverse (T2) relaxation times of the sample are determined.

7. 发明授权

US09612301B2 High-throughput and motion insensitive MRI accelerated with multi-echo planar acquisition and related systems 有权
公开(公告)号：US09612301B2
公开(公告)日：2017-04-04
申请号：US13982609
申请日：2012-02-13
申请人： Nan-kuei Chen
发明人： Nan-kuei Chen
IPC分类号： G01R33/32 , G01R33/561
CPC分类号： G01R33/32 , G01R33/5613 , G01R33/5616
摘要： Methods, systems, computer programs, circuits and workstations are configured to generate MRI images using an Echo-Planar Double-Echo Steady State (EP-DESS) pulse sequence and/or a Repeated Imaging with Echo-planar Navigation and Acceleration (RIENA) pulse sequence and image processing protocol to generate clinical MRI images.

8. 发明授权

US09594136B2 Magnetic resonance imaging apparatus and RF pulse control method 有权
标题翻译：磁共振成像装置和RF脉冲控制方法
公开(公告)号：US09594136B2
公开(公告)日：2017-03-14
申请号：US13808659
申请日：2011-06-28
申请人： Kenji Nakanishi , Hiroyuki Itagaki
发明人： Kenji Nakanishi , Hiroyuki Itagaki
IPC分类号： G01R33/54 , G06F17/11 , G01R33/561 , G01R33/565
CPC分类号： G01R33/543 , G01R33/5613 , G01R33/565 , G06F17/11
摘要： Disclosed are a magnetic resonance imaging apparatus and an RF pulse control method wherein an RF pulse sequence in a start-up sequence is set as a monotonically increasing flip angle with offset, in order to reduce ghosts, blurring, and other artifacts during measurement in a transient state. For example, the sum of two adjacent consecutive terms in a monotonically increasing sequence is set as the flip angle. Specifically, the number of RF pulses in the RF pulse sequence and the flip angle for the RF pulses in an SSFP sequence are set, and the monotonically increasing flip angle with offset is found, based on the set number of RF pulses in the RF pulse sequence and the flip angle for the RF pulses in the SSFP sequence, and used as the RF pulse sequence.
摘要翻译：公开了一种磁共振成像装置和RF脉冲控制方法，其中启动序列中的RF脉冲序列被设置为具有偏移的单调增加的翻转角，以便减少在测量期间的重影，模糊和其他伪像暂态例如，将单调递增序列中的两个相邻连续项的和设置为翻转角。具体地，设置RF脉冲序列中的RF脉冲的数量和SSFP序列中的RF脉冲的翻转角，并且基于RF脉冲中的设定的RF脉冲数，找到具有偏移的单调增加的翻转角序列和SSFP序列中RF脉冲的翻转角，并用作RF脉冲序列。

9. 发明授权

US09541624B2 Method and apparatus for magnetic resonance imaging 有权
标题翻译：用于磁共振成像的方法和装置
公开(公告)号：US09541624B2
公开(公告)日：2017-01-10
申请号：US14037619
申请日：2013-09-26
申请人： Cai Xia Fu
发明人： Cai Xia Fu
IPC分类号： G01R33/56 , G01R33/565 , G01R33/561
CPC分类号： G01R33/56527 , G01R33/5607 , G01R33/5613 , G01R33/56509
摘要： In a method and apparatus for magnetic resonance imaging, a flip angle and/or inversion time of a spectrum suppression pulse is calculated according to a steady state condition of a longitudinal magnetization component of a spectrum composition suppressed by the spectrum suppression pulse and a zero crossing point condition of the longitudinal magnetization component. Raw magnetic resonance image data are acquired by applying a magnetic resonance imaging sequence that includes the spectrum suppression pulse provided with the flip angle and/or the inversion time.
摘要翻译：在用于磁共振成像的方法和装置中，根据由频谱抑制脉冲抑制的频谱成分的纵向磁化分量的稳态条件和过零点来计算频谱抑制脉冲的翻转角和/或反转时间纵向磁化分量的点状态。原始磁共振图像数据通过应用包括具有翻转角和/或反转时间的频谱抑制脉冲的磁共振成像序列来获取。

10. 发明授权

US09526423B2 Method for non-contrast enhanced magnetic resonance angiography 有权
公开(公告)号：US09526423B2
公开(公告)日：2016-12-27
申请号：US15164159
申请日：2016-05-25
申请人： GHOST MEDICAL TECHNOLOGIES, LTD
发明人： Robert Edelman
IPC分类号： A61B5/00 , G01R33/563 , G01R33/567 , A61B5/02 , A61B5/0402 , A61B5/055 , G01R33/56 , G01R33/561 , G01R33/565
CPC分类号： A61B5/004 , A61B5/02007 , A61B5/0402 , A61B5/055 , A61B5/7285 , A61B5/7292 , G01R33/5607 , G01R33/5613 , G01R33/5635 , G01R33/56509 , G01R33/5673
摘要： A method for non-contrast enhanced magnetic resonance angiography (“MRA”) that has a short scan time and is insensitive to patient motion is provided. More particularly, the method provides significant arterial conspicuity and substantial venous signal suppression. A two-dimensional single shot acquisition is employed and timed to occur a specific time period after the occurrence of an R-wave in a contemporaneously recorded electrocardiogram. In this manner, k-space data is acquired that is substantially insensitive to variations in arterial flow velocity, or heart rate, and that further substantially suppresses unwanted venous signal in a prescribed imaging slice.

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