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公开(公告)号：US10191133B2
公开(公告)日：2019-01-29
申请号：US15102560
申请日：2014-12-04
IPC分类号： G01R33/565 , G01R33/48 , G01R33/561
摘要： An object (10) is placed in an examination volume of a MR device (1) and imaged using a multi-echo imaging technique which is robust with respect to motion. The imaging includes subjecting the object (10) to a number of shots of a multi-echo imaging sequence to generate a train of echo signals by each shot and acquiring the echo signals. Each echo signal represents a k-space profile, wherein k-space (20) is divided into a central k-space part (21) and one or more peripheral k-space parts (22, 23). The central k-space part (21) is sampled by a single shot of the multi-echo imaging sequence, and the peripheral k-space parts (22, 23) are sampled by one or more further shots (25, 28) of the multi-echo sequence; and an MR image is reconstructed from the k-space profiles.
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公开(公告)号：US20230024001A1
公开(公告)日：2023-01-26
申请号：US17787983
申请日：2020-12-15
摘要： Disclosed herein is a medical instrument (100, 200, 300, 400, 500, 600, 900) comprising a subject support (102) configured for supporting a subject (110) in a Fowler's position during a magnetic resonance imaging examination. The subject support comprises a leg support region (104) configured for supporting a leg region of the subject horizontally. The subject support further comprises a thoracic support (106) configured for supporting an upper body region of the subject. The subject support is configured such that the thoracic support is inclined (108) with respect to the leg support region to hold the subject in the Fowler's position. The medical instrument further comprises a breast support (114). The breast support comprises a planar support surface (116) configured for supporting breasts of the subject. The breast support is connected to the subject support. The support surface is configured for being horizontal during the magnetic resonance imaging examination.
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公开(公告)号：US10670678B2
公开(公告)日：2020-06-02
申请号：US15580402
申请日：2016-06-12
IPC分类号： G01R33/48 , G01R33/561 , G01R33/56 , G01R33/563
摘要： An object (10) is placed in an examination volume of a MR device (1). To enable fast MR imaging, a stack-of-stars acquisition scheme is employed with a reduced level of streaking artifacts. The acquisition scheme includes subjecting the object (10) to an imaging sequence of at least one RF pulse and switched magnetic field gradients and acquiring MR signals according to the stack-of-stars scheme. The MR signals are acquired as radial k-space profiles (S1-S12) from a number of parallel slices (21-27) arranged at different positions along a slice direction. The radial density of the k-space profiles (S1-S12) varies as a function of the slice position with the radial density being higher at more central k-space positions and lower at more peripheral k-space positions. The k-space profiles are acquired at a higher temporal density from slices at the more central positions than from slices at the more peripheral k-space positions. An MR image is reconstructed from the MR signals.
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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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公开(公告)号：US10175331B2
公开(公告)日：2019-01-08
申请号：US14425335
申请日：2013-09-03
IPC分类号： G01R33/385 , G01R33/565 , G01R33/48 , G01R33/54 , G01R33/561
摘要： The invention relates to a magnetic resonance imaging system (100) for acquiring at least one set of k-space blade data from an imaging zone of a subject (118), wherein the magnetic resonance imaging system (100) comprises a memory (138) for storing machine executable instructions and a processor (130) for controlling the magnetic resonance imaging system (100), wherein execution of the machine executable instructions causes the processor (130) to perform for each blade of the at least one set of k-space blade data: control the MRI system (100) to acquire at least one k-space blade data using at least one echo time for purposes of performing a Dixon technique, wherein k-space blade data are acquired in accordance with a blade shape; reconstruct at least one blade image data using the at least one k-space blade data; generate water blade image data and fat blade image data using the at least one blade image data; and transform the water and fat blade image data to water and fat k-space blade data respectively and perform PROPELLER reconstruction of the water and fat k-space blade data.
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公开(公告)号：US11269037B2
公开(公告)日：2022-03-08
申请号：US16754771
申请日：2018-10-05
IPC分类号： G01R33/567 , G01R33/48 , G01R33/561
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). It is an object of the invention to enable MR imaging using a radial (or spiral) acquisition scheme with a reduced level of motion artefacts. The method of the invention comprises the following sequence of steps: —detecting a momentary motion—induced displacement (Δ) of the object (10); —attributing the detected displacement (A) to a motion state (M1-M5), each motion state (M1-M5) corresponding to one of a plurality of contiguous ranges of displacements (Δ); —determining angular coordinates of a radial or spiral k-space profile by incrementing the angular coordinates individually for each motion state (M1-M5) starting from initial angular coordinates; —acquiring the k-space profile; —repeating steps a-d a number of times; and —reconstructing an MR image from at least the k-space profiles attributed to one of the motion states (M1-M5). Moreover, the invention relates to a MR device (1) for carrying out this method as well as to a computer program to be run on a MR device (1).
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公开(公告)号：US20150212183A1
公开(公告)日：2015-07-30
申请号：US14425335
申请日：2013-09-03
IPC分类号： G01R33/565 , G01R33/54 , G01R33/385 , G01R33/48
CPC分类号： G01R33/56527 , G01R33/385 , G01R33/4818 , G01R33/482 , G01R33/4824 , G01R33/4828 , G01R33/546 , G01R33/5615 , G01R33/5618
摘要： The invention relates to a magnetic resonance imaging system (100) for acquiring at least one set of k-space blade data from an imaging zone of a subject (118), wherein the magnetic resonance imaging system (100) comprises a memory (138) for storing machine executable instructions and a processor (130) for controlling the magnetic resonance imaging system (100), wherein execution of the machine executable instructions causes the processor (130) to perform for each blade of the at least one set of k-space blade data: control the MRI system (100) to acquire at least one k-space blade data using at least one echo time for purposes of performing a Dixon technique, wherein k-space blade data are acquired in accordance with a blade shape; reconstruct at least one blade image data using the at least one k-space blade data; generate water blade image data and fat blade image data using the at least one blade image data; and transform the water and fat blade image data to water and fat k-space blade data respectively and perform PROPELLER reconstruction of the water and fat k-space blade data.
摘要翻译： 本发明涉及一种用于从被摄体（118）的成像区域获取至少一组k空间叶片数据的磁共振成像系统（100），其中所述磁共振成像系统（100）包括存储器（138） 用于存储机器可执行指令和用于控制所述磁共振成像系统（100）的处理器（130），其中所述机器可执行指令的执行使所述处理器（130）针对所述至少一组k空间中的每个叶片执行 刀片数据：为了执行Dixon技术，使用至少一个回波时间来控制MRI系统（100）以获取至少一个k空间刀片数据，其中根据刀片形状获取k空间刀片数据; 使用所述至少一个k空间刀片数据重构至少一个刀片图像数据; 使用所述至少一个刀片图像数据生成水刀片图像数据和脂肪刀片图像数据; 并将水和脂肪叶片图像数据分别转换为水和脂肪k空间叶片数据，并对水和脂肪k空间叶片数据进行PROPELLER重建。
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公开(公告)号：US11067653B2
公开(公告)日：2021-07-20
申请号：US16619539
申请日：2018-06-04
IPC分类号： G01R33/48 , G01R33/50 , G01R33/56 , G01R33/561
摘要： The invention relates to a method of MR imaging of an object. It is an object of the invention to enable MR imaging using the stack-of-stars acquisition scheme with an enhanced control of the contrast of the reconstructed MR image. The method of the invention comprises the steps of: a) generating MR signals by subjecting the object (10) to a number of shots of a multi-echo imaging sequence comprising RF pulses and switched magnetic field gradients, wherein a train of echo signals is generated by each shot; b) acquiring the echo signals according to a stack-of-stars (i.e. a hybrid radial 3D acquisition scheme wherein radial sampling is performed in each slice plane and phase encoding is performed along the slice encoding direction) or stack-of-spirals scheme, wherein the echo signals are acquired as radial or spiral k-space profiles (S1-S12) arranged at different positions along a slice direction in k-space, wherein echo signals from different k-space slices are acquired in each shot of the imaging sequence and wherein the echo signals are acquired from each k-space slice with different relaxation time weightings; and c) reconstructing at least one MR image of a desired contrast from the acquired echo signals using a k-space weighted image contrast (KWIC) filter. Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).
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公开(公告)号：US10466322B2
公开(公告)日：2019-11-05
申请号：US15312805
申请日：2015-05-22
IPC分类号： G01R33/48 , G01R33/50 , G01R33/56 , G01R33/561 , G01R33/565
摘要： An object to be MR imaged (10) is placed in an examination volume of a MR device (1). For faster MR imaging a multi-echo imaging technique which is robust with respect to motion is used. The method includes generating echo signals by subjecting the object (10) to an imaging sequence, acquiring the echo signals, each echo signal being attributed to a k-space line, wherein a number of k-space lines, which are adjacently arranged in a part of k-space, are repeatedly sampled, with said number of k-space lines being sampled in a different sequential order per repetition, and reconstructing a MR image from the acquired echo signals.
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公开(公告)号：US10444315B2
公开(公告)日：2019-10-15
申请号：US14377213
申请日：2013-02-04
发明人： Gabriele Marianne Beck , Tim Nielsen , Arjan Willem Simonetti , Gwenael Henri Herigault , Mathijs Visser
IPC分类号： G01R33/565 , A61B5/055 , G01R33/385 , G01R33/34 , G01R33/48 , G01R33/567
摘要： At least a portion of a body (10) is placed in a main magnetic field Bo within the examination volume of a MR device. The portion of the body (10) is subject to an imaging sequence including one or more RF pulses and switched magnetic field gradients to acquire imaging signals. The portion of the body (10) is subject to a navigator sequence applied at least once before, during, or after the imaging sequence. The navigator sequence includes one or more RF pulses and switched magnetic field gradients controlled to acquire navigator signals with a single-point or multi-point Dixon technique. Translation and/or rotation and/or shear data reflecting motion of the body are derived from the navigator signals during the acquisition of the imaging signals. The translation and/or rotation and/or shear data are used for adapting the imaging sequence and/or for motion correction during reconstruction of an MR image.
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