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公开(公告)号：US10107884B2
公开(公告)日：2018-10-23
申请号：US14774187
申请日：2014-03-12
发明人： Peter Boernert , Michel Paul Jurriaan Jurrissen , Mariya Ivanova Doneva , Adrianus Joseph Willibrordus Duijndam , Kay Nehrke
IPC分类号： G01V3/00 , G01R33/561 , G01R33/34 , G01R33/56
摘要： A parallel magnetic resonance imaging system (1) includes at least one radio frequency (RF) coil (10, 12) with a plurality of coil elements, a smart select unit (24), a parallel imaging parameter unit (28), and a sequence control (16). The smart select unit (24), from a pre-scan or prior scan of a subject with the at least one RF coil, constructs (60) a signal map and a plurality of noise maps based on different sets of reduction factors. The parallel imaging parameter unit (28) selects a set of reduction factors corresponding to a noise map which includes a highest signal-to-noise ratio (SNR). The sequence control (16) performs a magnetic resonance imaging scan of the subject based on the selected reduction factors.
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公开(公告)号：US10295633B2
公开(公告)日：2019-05-21
申请号：US15529255
申请日：2015-11-30
IPC分类号： G01V3/00 , G01R33/48 , G01R33/56 , G01R33/483
摘要： The invention provides for a magnetic resonance imaging system (100) for acquiring magnetic resonance data (142) from a subject (118). The magnetic resonance imaging system comprises a processor (130) for controlling the magnetic resonance imaging system. The execution of the instructions causes the processor to control (200) the magnetic resonance imaging system with the pulse sequence data to acquire the magnetic resonance data. The pulse sequence data comprises commands for acquiring the magnetic resonance data using an n point Dixon magnetic resonance imaging method. The execution of the instructions causes the processor to construct (202) two phase candidate maps (144, 146) using the magnetic resonance data according to the n point Dixon magnetic resonance imaging method; divide (204) each of the set of voxels into a set of object voxels (148); identify (206) a set of boundary voxels (152) and interior voxels within the set of object voxels; create (208) a chosen phase candidate map (154) in the memory; select (210) a chosen phase map value for at least a portion of the set of boundary voxels in the chosen phase map from the two phase candidate maps by selecting the candidate phase map value which indicates the lowest fat to water ratio; and calculate (212) the phase map value of the object voxels according to a phase candidate selection algorithm.
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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：US11061098B2
公开(公告)日：2021-07-13
申请号：US16485484
申请日：2018-02-09
IPC分类号： G01R33/565 , G01R33/48 , G01R33/561 , G01R33/563
摘要： A magnetic resonance (MR) imaging system includes a memory for storing machine executable instructions and preparation pulse sequence commands. The preparation pulse sequence commands are configured to control the system to acquire the preliminary MR data as a first data portion and a second data portion; to generate a first bipolar readout gradient during acquisition of the first portion; and to generate a second bipolar readout gradient during acquisition of the second portion, wherein the first bipolar readout gradient has an opposite polarity to the second bipolar gradient. The system is further configured to calculate a measured normalised phase correction quantity in image space using the first and second data portions; and fit a modeled phase correction to the measured phase error, wherein modeled phase correction is an exponential of a complex value multiplied by a phase error function that is spatially dependent.
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公开(公告)号：US10234522B2
公开(公告)日：2019-03-19
申请号：US15021774
申请日：2014-08-27
IPC分类号： G01R33/48 , G01R33/565 , G01R33/561
摘要： An improved method of MR imaging of at least two chemical species having different MR spectra, such as water and fat, enables a precise quantification of water and fat or derived measures, such as a fat fraction. The method includes the steps of: a) generating two or more echo signals at different echo times by subjecting a body (10) placed in the examination volume of a MR device (1) to an imaging sequence of RF pulses and switched magnetic field gradients; b) acquiring the two or more echo signals; c) separating signal contributions of the at least two chemical species to the acquired echo signals on the basis of a signal model including the MR spectrum of each of the chemical species, the spatial variation of the main magnetic field in the examination volume, the effective transverse relaxation rate, and eddy current-induced phase errors. The eddy current-induced phase errors are estimated by a fitting procedure from the two or more echo signals.
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