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公开(公告)号：US10830856B2
公开(公告)日：2020-11-10
申请号：US16340492
申请日：2017-09-28
发明人： Peter Boernert , Miha Fuderer , Kay Nehrke , Klaas Pruessmann , Jurgen Edwin Rahmer , Bertram Wilm , Christian Stehning
IPC分类号： G01V3/00 , G01R33/565 , G01R33/385 , G01R33/561 , G01R33/24
摘要： A magnetic resonance imaging system includes a gradient system and a processor for controlling the magnetic resonance imaging system. Execution of machine executable instructions causes the magnetic resonance imaging system to: acquire by coil elements first magnetic resonance data simultaneously from a group of passive local probes, wherein the first group of passive local probes includes a plurality of passive local probes located spaced apart from each other; disentangle contributions to the first magnetic resonance data from the individual local probes, calculate for the magnetic resonance imaging system a gradient impulse response function of the gradient system using the first magnetic resonance data from the local probes; and determine correction factors using the gradient impulse response function
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公开(公告)号：US10551457B2
公开(公告)日：2020-02-04
申请号：US15512085
申请日：2015-08-17
IPC分类号： G01R33/48 , G01R33/483 , G01R33/54 , G01R33/561 , G01R33/565
摘要： The present invention relates to a method for side-band suppression in a Magnetic Resonance imaging, MRI, system (100), the method comprising providing a first multiband RF pulse for simultaneously exciting at least two slices in a subject (118) at a first and a second frequency band (301,303) and to acquire using the MRI system (100) signals (307, 308) from the excited two slices and at least one additional signal (309) at a third frequency band (305), the additional signal (309) resulting from a sideband excitation of a slice different from the two slices; using the first multiband RF pulse for determining the additional signal (309); deriving a pre-compensating term from the first multiband RF pulse and the additional signal (309), adding the pre-compensating term to the first multiband RF pulse to obtain a second multiband RF pulse, thereby replacing the first multiband RF pulse by the second multiband RF pulse for suppressing at least part of the additional signal (309).
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公开(公告)号：US10203387B2
公开(公告)日：2019-02-12
申请号：US14895242
申请日：2014-06-05
IPC分类号： A61B5/00 , A61B5/055 , G01R33/36 , G01R33/56 , G01R33/385 , G01R33/561
摘要： An object (10) in an examination volume of a MR device (1) is imaged with improved susceptibility weighted contrast. The imaging includes the steps of: a) generating at least two echo signals at different echo times by subjecting the object (10) to an imaging sequence of RF pulses and switched magnetic field gradients; b) acquiring the echo signals; c) repeating steps a) and b) for a plurality of phase encoding steps; d) reconstructing an intermediate MR image for each echo time from the acquired echo signals; and e) generating a susceptibility weighted MR image by computing, for each voxel of the susceptibility weighted MR image, a non-linear combination of the voxel values of the intermediate MR images at the respective image position. The non-linear combination emphasizes lower voxel magnitude values more than higher voxel magnitude values.
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公开(公告)号：US09964615B2
公开(公告)日：2018-05-08
申请号：US14778124
申请日：2014-03-12
IPC分类号： G01R33/48 , G01R33/561 , G01R33/565
CPC分类号： G01R33/4824 , G01R33/4828 , G01R33/561 , G01R33/5611 , G01R33/56545
摘要： The invention relates to a method of MR imaging of an object (10) placed in an examination volume of a MR device (1). The method comprises the steps of: subjecting the object (10) to an imaging sequence for acquiring MR signal data, wherein the MR signal data are acquired as a function of k-space position and time by using an irregular k-space sampling pattern with sub-sampling of k-space; reconstructing MR image data from the MR signal data, which MR image data comprise spatial dimensions and a frequency dimension, sparsity of the MR image data in a transform domain being exploited for suppressing sub-sampling artefacts in the MR image data. Moreover, the invention relates to a MR device (1) and to a computer program.
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公开(公告)号：US20160291106A1
公开(公告)日：2016-10-06
申请号：US14778124
申请日：2014-03-12
IPC分类号： G01R33/48 , G01R33/565 , G01R33/561
CPC分类号： G01R33/4824 , G01R33/4828 , G01R33/561 , G01R33/5611 , G01R33/56545
摘要： The invention relates to a method of MR imaging of an object (10) placed in an examination volume of a MR device (1). The method comprises the steps of: subjecting the object (10) to an imaging sequence for acquiring MR signal data, wherein the MR signal data are acquired as a function of k-space position and time by using an irregular k-space sampling pattern with sub-sampling of k-space; reconstructing MR image data from the MR signal data, which MR image data comprise spatial dimensions and a frequency dimension, sparsity of the MR image data in a transform domain being exploited for suppressing sub-sampling artefacts in the MR image data. Moreover, the invention relates to a MR device (1) and to a computer program.
摘要翻译： 本发明涉及放置在MR装置（1）的检查体积中的物体（10）的MR成像方法。 该方法包括以下步骤：对物体（10）进行成像序列获取MR信号数据，其中通过使用不规则的k空间采样模式来获取MR信号数据作为k空间位置和时间的函数， k空间的次采样; 从MR信号数据重建MR图像数据，MR图像数据包括空间维度和频率维度，被用于抑制MR图像数据中的子采样伪像的变换域中的MR图像数据的稀疏度。 此外，本发明涉及MR设备（1）和计算机程序。
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公开(公告)号：US10656227B2
公开(公告)日：2020-05-19
申请号：US15572202
申请日：2016-05-09
发明人： Patrick Gross , Miha Fuderer
IPC分类号： G01R33/389 , G01R33/565
摘要： A magnetic resonance examination system is disclosed comprising a field probe system to measure the magnetic field distribution of the main magnetic field and gradient magnetic field. The measurements are made in an earlier configuration and yield the resultant magnetic field due to gradient switching or external causes. From the measured resultant magnetic field the response relation is derived and stored in the memory. The response relation from the memory is available for compensating activation of the gradient fields or correction in reconstruction for the response relation in reconstruction. This compensation or correction can be carried-out in a current configuration. Thus is the current configuration to field probes are needed.
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17.发明申请MAGNETIC FIELD PROBE FOR MRI WITH A FLUOROELASTOMER OR A SOLUTION OF A FLUORINE-CONTAINING COMPOUND 审中-公开具有荧光体的MRI的磁场探针或含氟化合物的溶液公开(公告)号：US20140266201A1
公开(公告)日：2014-09-18
申请号：US14351753
申请日：2012-10-12
IPC分类号： G01R33/56
CPC分类号： G01R33/5601 , G01R33/24 , G01R33/34046 , G01R33/443 , G01R33/56563 , G01R33/58
摘要： A method of measuring a magnetic field within a magnetic resonance imaging system (300) comprising a magnet (304) with an imaging zone (308) and a radio-frequency transceiver (316). The magnetic resonance imaging system further comprises a magnetic field probe (322) located within the imaging zone. The magnetic field probe comprises a fluorine sample (404) comprising 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 comprises 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 comprises the steps of 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.
摘要翻译： 一种测量磁共振成像系统（300）内的磁场的方法，包括具有成像区（308）和射频收发器（316）的磁体（304）。 磁共振成像系统还包括位于成像区内的磁场探测器（322）。 磁场探针包括含氟物质（700），含氟离子液体（600）和含氟化合物溶液中的任何一种的氟样品（404）。 场探头还包括用于操纵氟样品的磁自旋并用于从氟样品接收氟磁共振数据的天线（406）。 天线连接到射频收发器。 该方法包括使用磁共振成像系统获取（100,200）氟磁共振数据的步骤; 以及使用氟磁共振数据计算（102,206）磁场强度（344）。
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公开(公告)号：US10955508B2
公开(公告)日：2021-03-23
申请号：US16326398
申请日：2017-08-22
IPC分类号： G01R33/561 , G01R33/565
摘要： A magnetic resonance imaging system (200, 300, 400) includes a radio-frequency system (216, 214) with multiple coil elements (214) for acquiring magnetic resonance data (264) and a memory (250) for storing machine executable instructions (260) and pulse sequence commands (262). The pulse sequence commands are configured for controlling the magnetic resonance imaging system to acquire the magnetic resonance data according to a SENSE imaging protocol. Execution of the machine executable instructions causes a processor (244) to: control (500) the magnetic resonance imaging system to acquire the magnetic resonance data using the pulse sequence commands; reconstruct (502) a set of folded magnetic resonance images (266) from the magnetic resonance data; calculate (504) a voxel deformation map (270) from a magnetic field inhomogeneity map; and calculate (506) a set of unfolding matrices (274) using a least partially a coil sensitivity matrix (272) for the multiple coil elements, wherein the set of unfolding matrices includes at least one modified unfolding matrix which is calculated at least partially using the a coil sensitivity matrix and the voxel deformation map. Undistorted magnetic resonance image data (276) is calculated (508) using the set of folded magnetic resonance images and the set of unfolding matrices.
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公开(公告)号：US10794979B2
公开(公告)日：2020-10-06
申请号：US15780658
申请日：2016-11-08
发明人： Peter Boernert , Miha Fuderer , Ivan Dimitrov
IPC分类号： G01R33/561 , G01R33/565
摘要： The invention provides for a magnetic resonance imaging system (100, 300) comprising: a radio-frequency system (116, 122, 124, 126, 126′, 126″, 126′″) for acquiring magnetic resonance data (152) from an imaging zone (108), wherein the radio-frequency system comprises multiple antenna elements (126, 126′, 126″, 126′″); a memory (140) containing machine executable instructions (170) and pulse sequence commands (150), wherein the pulse sequence commands cause the processor to acquire magnetic resonance data from the multiple antenna elements according to a SENSE protocol; and a processor. Execution of the machine executable instructions causes the processor to: control (200) the magnetic resonance imaging system with the pulse sequence commands to acquire the magnetic resonance data; reconstruct (202) a preliminary image (154) using the magnetic resonance imaging data; calculate (204) a fit (159) between an anatomical model (156) and the preliminary image, wherein the anatomical model comprises a motion likelihood map (158); identify (206) at least one image artifact origin (160) at least partially using the motion likelihood map and the fit; determine (208) an extended SENSE equation (162) at least partially using at least one image artifact origin; and construct (210) a corrected SENSE image (164) using the extended SENSE equation.
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20.发明授权公开(公告)号：US10473734B2
公开(公告)日：2019-11-12
申请号：US15533397
申请日：2015-12-04
IPC分类号： G01R33/28 , G01R33/341 , G01R33/36 , G01R33/24
摘要： The present invention provides a radio frequency (RF) receive coil device (110) for use in a magnetic resonance (MR) imaging system (100), comprising a RF receive coil (114), a plug (112) for connecting the RF receive coil (114) to the MR imaging system (100), sensing means (118) for sensing the presence of a magnetic field of the MR imaging system (100), detecting means (119) for detecting if the plug (112) is connected to the MR imaging system (100), and a warning means (120, 122) for generating a warning when the sensing means (118) sense the presence of a magnetic field of the MR imaging system (100) and the detecting means (119) detect that the plug (112) is not connected to the MR imaging system (100).
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